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='''<big>Introduction</big>'''=
A codec is a device or computer program for encoding or decoding a digital data stream or signal. Codec is a portmanteau of coder – decoder. A codec encodes a data stream or a signal for transmission and storage, possibly in encrypted form, and the decoder function reverses the encoding for playback or editing. <br> <br>
Below you will see a table of all Codec types with ID’s: 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Codec 8
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Codec 8 Extended
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Codec 16
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Codec 12
! colspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Codec 13
! rowspan="1" style="width:14%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Codec 14
|-
| style="vertical-align: middle; text-align: center;" |0x08
| style="vertical-align: middle; text-align: center;" |0x8E
| style="vertical-align: middle; text-align: center;" |0x10
| style="vertical-align: middle; text-align: center;" |0x0C
| style="vertical-align: middle; text-align: center;" |0x0D
| style="vertical-align: middle; text-align: center;" |0x0E
|-
|}
Also, there are using two data transport protocols: TCP and UDP. But it is not important which one will be used in Codec. 

='''<big>Codec for device data sending</big>'''=
In this chapter you will find information about every Codec protocol which are using for device data sending and differences between them.  

=='''<big>Codec 8</big>'''==

*'''<big>Protocol Overview</big>'''

Codec8 – a main FM device protocol that is used for sending data to server. <br> 

*'''<big>Codec 8 protocol sending over TCP</big>'''

TCP is a connection-oriented protocol that is used for communication between devices. The workings of this type of protocol is described below in the '''communication with server''' section. <br> 

*'''AVL Data Packet'''

Below table represents AVL Data Packet structure: 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |0x00000000 (Preamble)
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Data Field Length
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Codec ID
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Number of Data 1
! colspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Data
! rowspan="1" style="width:14%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Number of Data 2
! rowspan="1" style="width:14%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |CRC-16
|-
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |X bytes
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |4 bytes
|-
|}


'''Preamble''' – the packet starts with four zero bytes. <br>
'''Data Field Length''' – size is calculated starting from Codec ID to Number of Data 2. <br>
'''Codec ID''' – in Codec8 it is always <code>0x08</code>. <br>
'''Number of Data 1''' – a number which defines how many records is in the packet. <br>
'''AVL Data''' – actual data in the packet (more information below). <br>
'''Number of Data 2''' – a number which defines how many records is in the packet. This number must be the same as “Number of Data 1”. <br>
'''CRC-16''' – calculated from Codec ID to the Second Number of Data. CRC (Cyclic Redundancy Check) is an error-detecting code using for detect accidental changes to RAW data. For calculation we are using [[Codec#CRC-16|CRC-16/IBM]].<br> <br>
'''Note:''' for [[FMB630]], [[FMB640]] and [[FM6300|FM63XY]], minimum AVL record size is 45 bytes (all IO elements disabled). Maximum AVL record size is 255 bytes. Maximum AVL packet size is 512 bytes. For other devices, minimum AVL record size is 45 bytes (all IO elements disabled). Maximum AVL packet size is 1280 bytes. <br>

*AVL Data

Below table represents AVL Data structure. 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Timestamp
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Priority
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |GPS Element
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |IO Element
|-
| style="vertical-align: middle; text-align: center;" |8 bytes
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |15 bytes
| style="vertical-align: middle; text-align: center;" |X bytes
|-
|}


'''Timestamp''' – a difference, in milliseconds, between the current time and midnight, January, 1970 UTC (UNIX time). <br>
'''Priority''' – field which define AVL data priority (more information below). <br>
'''GPS Element''' – location information of the AVL data (more information below). <br>
'''IO Element''' – additional configurable information from device (more information below). <br> 

*Priority

Below table represents Priority values. Packet priority depends on device configuration and records sent. 
{| class="nd-othertables_2" style="width:25%;"
|+
! colspan="2" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Priority
|-
! rowspan="1" style="width:40%; vertical-align: middle; text-align: center;" |0
| style="vertical-align: middle; text-align: center;" |Low
|-
! rowspan="1" style="width:40%; vertical-align: middle; text-align: center;" |1
| style="vertical-align: middle; text-align: center;" |High
|-
! rowspan="1" style="width:40%; vertical-align: middle; text-align: center;" |2
| style="vertical-align: middle; text-align: center;" |Panic
|}<br />

*GPS element

Below table represents GPS Element structure: 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Longitude
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Latitude
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Altitude
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Angle
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Satellites
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Speed
|-
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |2 bytes
| style="vertical-align: middle; text-align: center;" |2 bytes
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
|}


'''Longitude''' – east – west position. <br>
'''Latitude''' – north – south position. <br>
'''Altitude''' – meters above sea level. <br>
'''Angle''' – degrees from north pole. <br>
'''Satellites''' – number of visible satellites. <br>
'''Speed''' – speed calculated from satellites. <br> <br>
'''Note:''' If record are without valid coordinates – (there were no GPS fix in the moment of data acquisition) – Longitude, Latitude and Altitude values are last valid fix, and Angle, Satellites and Speed are 0. <br> <br>
Longitude and latitude are integer values built from degrees, minutes, seconds and milliseconds by formula: <br>
[[Image:GPS.png]]
<br>
Where: <br>
d – Degrees; m – Minutes; s – Seconds; ms – Milliseconds; p – Precision (10000000) <br>
If longitude is in west or latitude in south, multiply result by –1. <br> <br>
Note: <br>
To determine if the coordinate is negative, convert it to binary format and check the very first bit. If it is 0, coordinate is positive, if it is 1, coordinate is negative. <br> <br>
Example: <br>
Received value: <code>20 9C CA 80</code> converted to BIN: <code>00100000 10011100 11001010 10000000</code> first bit is 0, which means coordinate is positive converted to DEC: <code>547146368</code>. For more information see two‘s complement arithmetic. <br>

*IO Element

{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |Event IO ID
| style="vertical-align: middle; text-align: center;" |1 byte
| rowspan="26" style=" width:5%; vertical-align: middle; text-align: left;" |
| rowspan="26" style=" width:65%; vertical-align: middle; text-align: left;" |'''Event IO ID''' – if data is acquired on event – this field defines which IO property has changed and generated an event. For example, when if Ignition state changed and it generate event, Event IO ID will be <code>0xEF</code> (AVL ID: 239). If it’s not eventual record – the value is 0. <br>
'''N''' – a total number of properties coming with record (N = N1 + N2 + N4 + N8). <br>
'''N1''' – number of properties, which length is 1 byte. <br>
'''N2''' – number of properties, which length is 2 bytes. <br>
'''N4''' – number of properties, which length is 4 bytes. <br>
'''N8''' – number of properties, which length is 8 bytes. <br>
'''N’th IO ID''' - AVL ID. <br>
'''N’th IO Value''' - AVL ID value. <br>
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N of Total IO
| style="vertical-align: middle; text-align: center;" |1 byte
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N1 of One Byte IO
| style="vertical-align: middle; text-align: center;" |1 byte
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |1 byte
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |1 byte
|-
| colspan="2" style="vertical-align: middle; text-align: center;" |...
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N1’th IO ID
| style="vertical-align: middle; text-align: center;" |1 byte
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N1’th IO Value
| style="vertical-align: middle; text-align: center;" |1 byte
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N2 of Two Bytes
| style="vertical-align: middle; text-align: center;" |1 byte
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |1 byte
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
| colspan="2" style="vertical-align: middle; text-align: center;" |...
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N2’th IO ID
| style="vertical-align: middle; text-align: center;" |1 byte
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N2’th IO Value
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N4 of Four Bytes
| style="vertical-align: middle; text-align: center;" |1 byte
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |1 byte
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |4 bytes
|-
| colspan="2" style="vertical-align: middle; text-align: center;" |...
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N4’th IO ID
| style="vertical-align: middle; text-align: center;" |1 byte
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N4’th IO Value
| style="vertical-align: middle; text-align: center;" |4 byte
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N8 of Eight Bytes
| style="vertical-align: middle; text-align: center;" |1 byte
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |1 byte
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |8 byte
|-
| colspan="2" style="vertical-align: middle; text-align: center;" |...
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N8’IO ID
| style="vertical-align: middle; text-align: center;" |1 byte
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N8’IO Value
| style="vertical-align: middle; text-align: center;" |8 bytes
|-
|} <br />

*'''Communication with server'''

First, when module connects to server, module sends its IMEI. First comes short identifying number of bytes written and then goes IMEI as text (bytes). <br>
For example, IMEI <code>356307042441013</code> would be sent as <code>000F333536333037303432343431303133</code>. <br>
First two bytes denote IMEI length. In this case <code>0x000F</code> means, that IMEI is 15 bytes long. <br>
After receiving IMEI, server should determine if it would accept data from this module. If yes, server will reply to module <code>01</code>, if not - <code>00</code>. Note that confirmation should be sent as binary packet. I.e. 1 byte <code>0x01</code> or <code>0x00</code>. <br>
Then module starts to send first AVL data packet. After server receives packet and parses it, server must report to module number of data received as integer (four bytes). <br>
If sent data number and reported by server doesn’t match module resends sent data. <br> 

*Example:  <br>

Module connects to server and sends IMEI: <br>
<code>000F333536333037303432343431303133</code> <br>
Server accepts the module: <br>
01 <br>
Module sends data packet: 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Data Packet Header
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Data Array
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |CRC-16
|-
| style="vertical-align: middle; text-align: center;" |Four Zero Bytes – 0x00000000,
“AVL Data Array” length – 0x000000FE
| style="vertical-align: middle; text-align: center;" |Codec ID – 0x08,
Number of Data – '''0x02''' <br>
(Encoded using continuous bit stream. Last byte padded to align to byte boundary)
| style="vertical-align: middle; text-align: center;" |CRC of “AVL Data Array”
|-
| style="vertical-align: middle; text-align: center;" |00000000000000FE
| style="vertical-align: middle; text-align: center;" |08'''02'''...(data elements)...'''02'''
| style="vertical-align: middle; text-align: center;" |00008612
|-
|} 


Server acknowledges data reception (2 data elements): '''<code>00000002</code>''' <br> 

*'''Examples'''

Hexadecimal stream of AVL Data Packet receiving and response in these examples are given in hexadecimal form. The different fields of packets are separate into different table columns for better readability and some of them are converted to ASCII values for better understanding. <br> 

'''1'st example''' <br>
Receiving one data record with each element property (1 byte, 2 bytes, 4 byte and 8 byte). <br> <br>
Received data in hexadecimal stream: <br>
<code>000000000000003608010000016B40D8EA30010000000000000000000000000000000105021503010101425E0F01F10000601A014E0000000000000000010000C7CF</code> <br> <br>
Parsed: 
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="3" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Data Packet
|-
! colspan="2" rowspan="1" style="width:60%; vertical-align: middle; text-align: center;" |AVL Data Packet Part
! rowspan="1" style="width:40%; vertical-align: middle; text-align: center;" |HEX Code Part
|-
| rowspan="4" style="vertical-align: middle; text-align: center;" |
| style="vertical-align: middle; text-align: center;" |Zero Bytes
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Data Field Length
| style="vertical-align: middle; text-align: center;" |00 00 00 36
|-
| style="vertical-align: middle; text-align: center;" |Codec ID
| style="vertical-align: middle; text-align: center;" |08
|-
| style="vertical-align: middle; text-align: center;" |Number of Data 1 (Records)
| style="vertical-align: middle; text-align: center;" |01
|-
| rowspan="24" style="vertical-align: middle; text-align: center;" |AVL Data
| style="vertical-align: middle; text-align: center;" |Timestamp
| style="vertical-align: middle; text-align: center;" |00 00 01 6B 40 D8 EA 30 (GMT: Monday, June 10, 2019 10:04:46 AM)
|-
| style="vertical-align: middle; text-align: center;" |Priority
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |Longitude
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Latitude
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Altitude
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Angle
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Satellites
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |Speed
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Event IO ID
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |N of Total ID
| style="vertical-align: middle; text-align: center;" |05
|-
| style="vertical-align: middle; text-align: center;" |N1 of One Byte IO
| style="vertical-align: middle; text-align: center;" |02
|-
| style="vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |15 (AVL ID: 21, Name: GSM Signal)
|-
| style="vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |03
|-
| style="vertical-align: middle; text-align: center;" |2’nd IO ID
| style="vertical-align: middle; text-align: center;" |01 (AVL ID: 1, Name: DIN1)
|-
| style="vertical-align: middle; text-align: center;" |2’nd IO Value
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |N2 of Two Bytes IO
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |42 (AVL ID: 66, Name: External Voltage)
|-
| style="vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |5E 0F
|-
| style="vertical-align: middle; text-align: center;" |N4 of Four Bytes IO
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |F1 (AVL ID: 241, Name: Active GSM Operator)
|-
| style="vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |00 00 60 1A
|-
| style="vertical-align: middle; text-align: center;" |N8 of Eight Bytes IO
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |4E (AVL ID: 78, Name: iButton)
|-
| style="vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |00 00 00 00 00 00 00 00
|-
| rowspan="2" style="vertical-align: middle; text-align: center;" |
| style="vertical-align: middle; text-align: center;" |Number of Data 2 (Number of Total Records)
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |CRC-16
| style="vertical-align: middle; text-align: center;" |00 00 C7 CF
|-
|} 


Server response: <code>00000001</code> <br> 

'''2'nd example''' <br>
Receiving one data record with one or two different element properties (1 byte, 2 byte). <br> <br>
Received data in hexadecimal stream: <br>
<code>000000000000002808010000016B40D9AD80010000000000000000000000000000000103021503010101425E100000010000F22A</code> <br> <br>
Parsed: 
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="3" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Data Packet
|-
! colspan="2" rowspan="1" style="width:60%; vertical-align: middle; text-align: center;" |AVL Data Packet Part
! rowspan="1" style="width:40%; vertical-align: middle; text-align: center;" |HEX Code Part
|-
| rowspan="4" style="vertical-align: middle; text-align: center;" |
| style="vertical-align: middle; text-align: center;" |Zero Bytes
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Data Field Length
| style="vertical-align: middle; text-align: center;" |00 00 00 28
|-
| style="vertical-align: middle; text-align: center;" |Codec ID
| style="vertical-align: middle; text-align: center;" |08
|-
| style="vertical-align: middle; text-align: center;" |Number of Data 1 (Records)
| style="vertical-align: middle; text-align: center;" |01
|-
| rowspan="20" style="vertical-align: middle; text-align: center;" |AVL Data
| style="vertical-align: middle; text-align: center;" |Timestamp
| style="vertical-align: middle; text-align: center;" |00 00 01 6B 40 D9 AD 80 (GMT: Monday, June 10, 2019 10:05:36 AM)
|-
| style="vertical-align: middle; text-align: center;" |Priority
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |Longitude
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Latitude
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Altitude
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Angle
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Satellites
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |Speed
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Event IO ID
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |N of Total ID
| style="vertical-align: middle; text-align: center;" |03
|-
| style="vertical-align: middle; text-align: center;" |N1 of One Byte IO
| style="vertical-align: middle; text-align: center;" |02
|-
| style="vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |15 (AVL ID: 21, Name: GSM Signal)
|-
| style="vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |03
|-
| style="vertical-align: middle; text-align: center;" |2’nd IO ID
| style="vertical-align: middle; text-align: center;" |01 (AVL ID: 1, Name: DIN1)
|-
| style="vertical-align: middle; text-align: center;" |2’nd IO Value
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |N2 of Two Bytes IO
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |42 (AVL ID: 66, Name: External Voltage)
|-
| style="vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |5E 10
|-
| style="vertical-align: middle; text-align: center;" |N4 of Four Bytes IO
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |N8 of Eight Bytes IO
| style="vertical-align: middle; text-align: center;" |00
|-
| rowspan="2" style="vertical-align: middle; text-align: center;" |
| style="vertical-align: middle; text-align: center;" |Number of Data 2 (Number of Total Records)
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |CRC-16
| style="vertical-align: middle; text-align: center;" |00 00 F2 2A
|-
|} 


Server response: <code>00000001</code> <br> 

'''3'rd example''' <br>
Receiving two or more data records with one or more different element properties. <br> <br>
Received data in hexadecimal stream: <br>
<code>000000000000004308020000016B40D57B480100000000000000000000000000000001010101000000000000016B40D5C198010000000000000000000000000000000
101010101000000020000252C</code> <br> <br>
Parsed: 
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="3" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Data Packet
|-
! colspan="2" rowspan="1" style="width:60%; vertical-align: middle; text-align: center;" |AVL Data Packet Part
! rowspan="1" style="width:40%; vertical-align: middle; text-align: center;" |HEX Code Part
|-
| rowspan="4" style="vertical-align: middle; text-align: center;" |
| style="vertical-align: middle; text-align: center;" |Zero Bytes
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Data Field Length
| style="vertical-align: middle; text-align: center;" |00 00 00 43
|-
| style="vertical-align: middle; text-align: center;" |Codec ID
| style="vertical-align: middle; text-align: center;" |08
|-
| style="vertical-align: middle; text-align: center;" |Number of Data 1 (Records)
| style="vertical-align: middle; text-align: center;" |02
|-
| rowspan="16" style="vertical-align: middle; text-align: center;" |AVL Data
(1'st record)
| style="vertical-align: middle; text-align: center;" |Timestamp
| style="vertical-align: middle; text-align: center;" |00 00 01 6B 40 D5 7B 48 (GMT: Monday, June 10, 2019 10:01:01 AM)
|-
| style="vertical-align: middle; text-align: center;" |Priority
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |Longitude
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Latitude
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Altitude
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Angle
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Satellites
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |Speed
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Event IO ID
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |N of Total ID
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |N1 of One Byte IO
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |01 (AVL ID: 1, Name: DIN1)
|-
| style="vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |N2 of Two Bytes IO
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |N4 of Four Bytes IO
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |N8 of Eight Bytes IO
| style="vertical-align: middle; text-align: center;" |00
|-
| rowspan="16" style="vertical-align: middle; text-align: center;" |AVL Data
(2'nd record)
| style="vertical-align: middle; text-align: center;" |Timestamp
| style="vertical-align: middle; text-align: center;" |00 00 01 6B 40 D5 C1 98 (GMT: Monday, June 10, 2019 10:01:19 AM)
|-
| style="vertical-align: middle; text-align: center;" |Priority
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |Longitude
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Latitude
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Altitude
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Angle
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Satellites
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |Speed
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Event IO ID
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |N of Total ID
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |N1 of One Byte IO
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |01 (AVL ID: 1, Name: DIN1)
|-
| style="vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |N2 of Two Bytes IO
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |N4 of Four Bytes IO
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |N8 of Eight Bytes IO
| style="vertical-align: middle; text-align: center;" |00
|-
| rowspan="2" style="vertical-align: middle; text-align: center;" |
| style="vertical-align: middle; text-align: center;" |Number of Data 2 (Number of Total Records)
| style="vertical-align: middle; text-align: center;" |02
|-
| style="vertical-align: middle; text-align: center;" |CRC-16
| style="vertical-align: middle; text-align: center;" |00 00 25 2C
|-
|} 


Server response: <code>00000002</code> <br> 

*'''<big>Codec8 protocol sending over UDP</big>'''

Codec8 protocol over UDP is a transport layer protocol above UDP/IP to add reliability to plain UDP/IP using acknowledgment packets. <br>

*'''AVL Data Packet'''

The packet structure is as follows: 
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="2" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |UDP Datagram
|-
| style="vertical-align: middle; text-align: center;" |Example
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
| style="vertical-align: middle; text-align: center;" |Packet ID
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
| style="vertical-align: middle; text-align: center;" |Not Usable Byte
| style="vertical-align: middle; text-align: center;" |1 byte
|-
| style="vertical-align: middle; text-align: center;" |Packet Payload
| style="vertical-align: middle; text-align: center;" |Variable
|-
|}


'''Example''' – packet length (excluding this field) in big ending byte order. <br>
'''Packet ID''' – packet ID unique for this channel. <br>
'''Not Usable Byte''' – not usable byte. <br>
'''Packet payload''' – data payload. <br> 

*Acknowledgment packet

Acknowledgment packet should have the same Packet ID as acknowledged data packet and empty Data Payload. Acknowledgement should be sent in binary format. 
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="3" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Acknowledgment Packet
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |Packet Length
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |Packet ID
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |Not Usable Byte
|-
| style="vertical-align: middle; text-align: center;" |2 bytes
| style="vertical-align: middle; text-align: center;" |2 bytes
| style="vertical-align: middle; text-align: center;" |1 byte
|-
|}


'''Packet Length''' – packet length by sending/response data. <br>
'''Packet ID''' – same as in acknowledgment packet. <br>
'''Not Usable Byte''' – always will be <code>0x01</code>. <br> 

*Sending AVL Packet Payload using UDP channel

Below table represents Sending Packet Payload structure. 
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="4" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL data encapsulated in UDP channel packet
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |AVL Packet ID
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |IMEI Length
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |Module IMEI
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |AVL Data Array
|-
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |2 bytes
| style="vertical-align: middle; text-align: center;" |15 bytes
| style="vertical-align: middle; text-align: center;" |X bytes
|-
|}
'''AVL Packet ID''' – ID identifying this AVL packet. <br>
'''IMEI Length''' – always will be <code>0x000F</code>. <br>
'''Module IMEI''' – IMEI of a sending module encoded the same as with TCP. <br>
'''AVL Data Array''' – array of encoded AVL data (same as TCP AVL Data Array). <br> 

*Server response Packet Payload using UDP channel

Below table represents Server Response Packet Payload structure. 
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="2" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Server Response to AVL Data Packet
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |AVL Packet ID
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |Number of Accepted AVL Elements
|-
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |1 byte
|-
|} <br />

*'''Communication with server'''

Module sends UDP channel packet with encapsulated AVL data packet. Server sends UDP channel packet with encapsulated response module validates AVL Packet ID and Number of accepted AVL elements. If server response with valid AVL Packet ID is not received within configured timeout, module can retry sending. <br>

*Example:

Module sends the data: 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |UDP Channel Header
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Packet Header
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Data Array
|-
| style="vertical-align: middle; text-align: center;" |Length – 0x00FE,
Packet ID – 0xCAFE <br>
Not Usable Byte – 0x01
| style="vertical-align: middle; text-align: center;" |AVL Packet ID – 0xDD,
IMEI Length – 0x000F <br>
IMEI – 0x313233343536373839303132333435
(Encoded using continuous bit stream. Last byte padded to align to byte boundary)
| style="vertical-align: middle; text-align: center;" |Codec ID – 0x08,
Number of Data – 0x02 <br>
(Encoded using continuous bit stream)
|-
| style="vertical-align: middle; text-align: center;" |00FECAFE01
| style="vertical-align: middle; text-align: center;" |DD000F3133343536373839303132333435
| style="vertical-align: middle; text-align: center;" |0802…(data elements)…02
|-
|} 


Server must respond with acknowledgment: 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |UDP Channel Header
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Packet Acknowledgment
|-
| style="vertical-align: middle; text-align: center;" |Length – 0x0005,
Packet ID – 0xCAFE,
Not Usable Byte – 0x01
| style="vertical-align: middle; text-align: center;" |AVL Packet ID – 0xDD,
Number of Accepted Data – 0x02
|-
| style="vertical-align: middle; text-align: center;" |0005CAFE01
| style="vertical-align: middle; text-align: center;" |DD02
|-
|}<br />

*'''Example'''

Hexadecimal stream of AVL Data Packet receiving and response in this example are given in hexadecimal form. The different fields of packet are separate into different table columns for better readability and some of them are converted to ASCII values for better understanding. <br> <br>
Received data in hexadecimal stream: <br>
<code>003DCAFE0105000F33353230393330383634303336353508010000016B4F815B30010000000000000000000000000000000103021503010101425DBC000001</code> <br> <br>
Parsed: 
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="3" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Data Packet
|-
! colspan="2" rowspan="1" style="width:60%; vertical-align: middle; text-align: center;" |AVL Data Packet Part
! rowspan="1" style="width:40%; vertical-align: middle; text-align: center;" |HEX Code Part
|-
| rowspan="3" style="vertical-align: middle; text-align: center;" |UDP Channel Header
| style="vertical-align: middle; text-align: center;" |Length
| style="vertical-align: middle; text-align: center;" |00 3D
|-
| style="vertical-align: middle; text-align: center;" |Packet ID
| style="vertical-align: middle; text-align: center;" |CA FE
|-
| style="vertical-align: middle; text-align: center;" |Not usable byte
| style="vertical-align: middle; text-align: center;" |01
|-
| rowspan="3" style="vertical-align: middle; text-align: center;" |AVL Packet Header
| style="vertical-align: middle; text-align: center;" |AVL packet ID
| style="vertical-align: middle; text-align: center;" |05
|-
| style="vertical-align: middle; text-align: center;" |IMEI Length
| style="vertical-align: middle; text-align: center;" |00 0F
|-
| style="vertical-align: middle; text-align: center;" |IMEI
| style="vertical-align: middle; text-align: center;" |33 35 32 30 39 33 30 38 36 34 30 33 36 35 35
|-
| rowspan="23" style="vertical-align: middle; text-align: center;" |AVL Data Array
| style="vertical-align: middle; text-align: center;" |Codec ID
| style="vertical-align: middle; text-align: center;" |08
|-
| style="vertical-align: middle; text-align: center;" |Number of Data 1 (Records)
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |Timestamp
| style="vertical-align: middle; text-align: center;" |00 00 01 6B 4F 81 5B 30 (GMT: Thursday, June 13, 2019 6:23:26 AM)
|-
| style="vertical-align: middle; text-align: center;" |Priority
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |Longitude
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Latitude
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Altitude
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Angle
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Satellites
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |Speed
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Event IO ID
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |N of Total ID
| style="vertical-align: middle; text-align: center;" |03
|-
| style="vertical-align: middle; text-align: center;" |N1 of One Byte IO
| style="vertical-align: middle; text-align: center;" |02
|-
| style="vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |15 (AVL ID: 21, Name: GSM Signal)
|-
| style="vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |03
|-
| style="vertical-align: middle; text-align: center;" |2’nd IO ID
| style="vertical-align: middle; text-align: center;" |01 (AVL ID: 1, Name: DIN1)
|-
| style="vertical-align: middle; text-align: center;" |2’nd IO Value
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |N2 of Two Bytes IO
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |42 (AVL ID: 66, Name: External Voltage)
|-
| style="vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |5D BC
|-
| style="vertical-align: middle; text-align: center;" |N4 of Four Bytes IO
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |N8 of Eight Bytes IO
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |Number of Data 2 (Number of Total Records)
| style="vertical-align: middle; text-align: center;" |01
|-
|} 


Server response in hexadecimal stream:
<code>0005CAFE010501</code> <br> <br>
Parsed:
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="3" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Server Response to AVL Data Packet
|-
! colspan="2" rowspan="1" style="width:60%; vertical-align: middle; text-align: center;" |Server Response Part
! rowspan="1" style="width:40%; vertical-align: middle; text-align: center;" |HEX Code Part
|-
| rowspan="3" style="vertical-align: middle; text-align: center;" |UDP Channel Header
| style="vertical-align: middle; text-align: center;" |Length
| style="vertical-align: middle; text-align: center;" |00 05
|-
| style="vertical-align: middle; text-align: center;" |Packet ID
| style="vertical-align: middle; text-align: center;" |CA FE
|-
| style="vertical-align: middle; text-align: center;" |Not usable byte
| style="vertical-align: middle; text-align: center;" |01
|-
| rowspan="2" style="vertical-align: middle; text-align: center;" |AVL Packet Acknowledgment
| style="vertical-align: middle; text-align: center;" |AVL packet ID
| style="vertical-align: middle; text-align: center;" |05
|-
| style="vertical-align: middle; text-align: center;" |Number of Accepted Data
| style="vertical-align: middle; text-align: center;" |01
|-
|} <br />

=='''<big>Codec 8 Extended</big>'''==

*'''<big>Protocols overview</big>'''

Codec8 Extended is using for FMBXXX family devices. This protocol looks familiar like Codec8 but they have some differences. Main differences between are shown in below table: 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Codec8
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Codec8 Extended
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |Codec ID
| style="vertical-align: middle; text-align: center;" |0x08
| style="vertical-align: middle; text-align: center;" |0x8E
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |AVL Data IO element length
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |AVL Data IO element total IO count length
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |AVL Data IO element IO count length
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |AVL Data IO element AVL ID length
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |Variable size IO elements
| style="vertical-align: middle; text-align: center;" |Does not include
| style="vertical-align: middle; text-align: center;" |Includes variable size elements
|-
|} <br />

*'''<big>Codec 8 Extended protocol sending over TCP</big>'''
 
*'''AVL data packet'''

Below table represents AVL data packet structure: 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |0x00000000 (Preamble)
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Data Field Length
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Codec ID
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Number of Data 1
! colspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Data
! rowspan="1" style="width:14%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Number of Data 2
! rowspan="1" style="width:14%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |CRC-16
|-
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |X bytes
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |4 bytes
|-
|}


'''Preamble''' – the packet starts with four zero bytes. <br>
'''Data Field Length''' – size is calculated starting from Codec ID to Number of Data 2. <br>
'''Codec ID''' – in Codec8 Extended it is always <code>0x8E</code>. <br>
'''Number of Data 1''' – a number which defines how many records is in the packet. <br>
'''AVL Data''' – actual data in the packet (more information below). <br>
'''Number of Data 2''' – a number which defines how many records is in the packet. This number must be the same as “Number of Data 1”. <br>
'''CRC-16''' – calculated from Codec ID to the Second Number of Data. CRC (Cyclic Redundancy Check) is an error-detecting code using for detect accidental changes to RAW data. For calculation we are using [[Codec#CRC-16|CRC-16/IBM]].<br> <br>
'''Note:''' for [[FMB630]], [[FMB640]] and [[FM6300|FM63XY]], minimum AVL packet size is 45 bytes (all IO elements disabled). Maximum AVL packet size is 255 bytes. For other devices, minimum AVL packet size is 45 bytes (all IO elements disabled). Maximum AVL packet size is 1280 bytes. <br> 

*AVL Data

Below table represents AVL Data structure: 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Timestamp
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Priority
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |GPS Element
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |IO Element
|-
| style="vertical-align: middle; text-align: center;" |8 bytes
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |15 bytes
| style="vertical-align: middle; text-align: center;" |X bytes
|-
|}


'''Timestamp''' – a difference, in milliseconds, between the current time and midnight, January, 1970 UTC (UNIX time). <br>
'''Priority''' – field which define AVL data priority (more information below). <br>
'''GPS Element''' – locational information of the AVL data (more information below). <br>
'''IO Element''' – additional configurable information from device (more information below). <br> 

*Priority

Below table represents Priority values. Packet priority depends on device configuration and records sent. 
{| class="nd-othertables_2" style="width:25%;"
|+
! colspan="2" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Priority
|-
! rowspan="1" style="width:40%; vertical-align: middle; text-align: center;" |0
| style="vertical-align: middle; text-align: center;" |Low
|-
! rowspan="1" style="width:40%; vertical-align: middle; text-align: center;" |1
| style="vertical-align: middle; text-align: center;" |High
|-
! rowspan="1" style="width:40%; vertical-align: middle; text-align: center;" |2
| style="vertical-align: middle; text-align: center;" |Panic
|} <br />

*GPS element

Below table represents GPS Element structure: 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Longitude
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Latitude
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Altitude
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Angle
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Satellites
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Speed
|-
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |2 bytes
| style="vertical-align: middle; text-align: center;" |2 bytes
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
|}


'''Longitude''' – east – west position. <br>
'''Latitude''' – north – south position. <br>
'''Altitude''' – meters above sea level. <br>
'''Angle''' – degrees from north pole. <br>
'''Satellites''' – number of visible satellites. <br>
'''Speed''' – speed calculated from satellites. <br> <br>
'''Note:''' If record are without valid coordinates – (there were no GPS fix in the moment of data acquisition) – Longitude, Latitude and Altitude values are last valid fix, and Angle, Satellites and Speed are 0. <br> <br>
Longitude and latitude are integer values built from degrees, minutes, seconds and milliseconds by formula: <br>
[[Image:GPS.png]]
<br>
Where: <br>
d – Degrees; m – Minutes; s – Seconds; ms – Milliseconds; p – Precision (10000000) <br>
If longitude is in west or latitude in south, multiply result by –1. <br> <br>
Note: <br>
To determine if the coordinate is negative, convert it to binary format and check the very first bit. If it is <code>0</code>, coordinate is positive, if it is <code>1</code>, coordinate is negative. <br> <br>
Example: <br>
Received value: <code>20 9C CA 80</code> converted to BIN: <code>00100000 10011100 11001010 10000000</code> first bit is 0, which means coordinate is positive converted to DEC: <code>547146368</code>. For more information see two‘s complement arithmetic. <br> 

*IO Element

{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |Event IO ID
| style="vertical-align: middle; text-align: center;" |2 bytes
| rowspan="33" style=" width:5%; vertical-align: middle; text-align: left;" |
| rowspan="33" style=" width:65%; vertical-align: middle; text-align: left;" |'''Event IO ID''' – if data is acquired on event – this field defines which IO property has changed and generated an event. For example, when if Ignition state changed and it generate event, Event IO ID will be 0x00EF (AVL ID: 239). If it’s not eventual record – the value is 0x0000. <br>
'''N''' – a total number of properties coming with record (N = N1 + N2 + N4 + N8). <br>
'''N1''' – number of properties, which length is 1 byte. <br>
'''N2''' – number of properties, which length is 2 bytes. <br>
'''N4''' – number of properties, which length is 4 bytes. <br>
'''N8''' – number of properties, which length is 8 bytes. <br>
'''NX''' – a number of properties, which length is defined by length element.
'''N’th IO ID''' - AVL ID. <br>
'''N'th Lenght''' - AVL ID value lenght. <br>
'''N’th IO Value''' - AVL ID value. <br> <br>
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N of Total IO
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N1 of One Byte IO
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |1 byte
|-
| colspan="2" style="vertical-align: middle; text-align: center;" |...
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N1’th IO ID
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N1’th IO Value
| style="vertical-align: middle; text-align: center;" |1 byte
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N2 of Two Bytes
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
| colspan="2" style="vertical-align: middle; text-align: center;" |...
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N2’th IO ID
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N2’th IO Value
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N4 of Four Bytes
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |4 bytes
|-
| colspan="2" style="vertical-align: middle; text-align: center;" |...
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N4’th IO ID
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N4’th IO Value
| style="vertical-align: middle; text-align: center;" |4 byte
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N8 of Eight Bytes
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |8 byte
|-
| colspan="2" style="vertical-align: middle; text-align: center;" |...
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N8’IO ID
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N8’IO Value
| style="vertical-align: middle; text-align: center;" |8 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |NX of X Byte IO
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO Length
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |Defined by lenght
|-
| colspan="2" style="vertical-align: middle; text-align: center;" |...
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |NX’th IO ID
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |NX’th Length
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |NX’th Value
| style="vertical-align: middle; text-align: center;" |Defined by lenght
|-
|} <br />

*'''Communication with server'''

Communication with server is the same as with Codec8 protocol, except in Codec8 Extended protocol Codec ID is 0x8E. <br> 

*Example:

Module connects to server and sends IMEI: <br>
<code>000F333536333037303432343431303133</code> <br>
Server accepts the module: <br>
<code>01</code> <br>
Module sends data packet: 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Data Packet Header
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Data Array
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |CRC-16
|-
| style="vertical-align: middle; text-align: center;" |Four Zero Bytes – 0x00000000,
“AVL Data Array” length – 0x000000FE
| style="vertical-align: middle; text-align: center;" |Codec ID – 0x8E,
Number of Data – '''0x02''' <br>
(Encoded using continuous bit stream. Last byte padded to align to byte boundary)
| style="vertical-align: middle; text-align: center;" |CRC of “AVL Data Array”
|-
| style="vertical-align: middle; text-align: center;" |00000000000000FE
| style="vertical-align: middle; text-align: center;" |8E'''02'''...(data elements)...'''02'''
| style="vertical-align: middle; text-align: center;" |00008612
|-
|}


Server acknowledges data reception (2 data elements): '''<code>00000002</code>''' <br> 

*'''Example'''

Hexadecimal stream of AVL Data Packet receiving and response in this example are given in hexadecimal form. The different fields of packet are separate into different table columns for better readability and some of them are converted to ASCII values for better understanding. <br> <br>
Received data in hexadecimal stream: <br>
<code>000000000000004A8E010000016B412CEE000100000000000000000000000000000000010005000100010100010011001D00010010015E2C880002000B000000003544C87
A000E000000001DD7E06A00000100002994</code> <br> <br>
Parsed data:
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="3" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Data Packet
|-
! colspan="2" rowspan="1" style="width:60%; vertical-align: middle; text-align: center;" |AVL Data Packet Part
! rowspan="1" style="width:40%; vertical-align: middle; text-align: center;" |HEX Code Part
|-
| rowspan="4" style="vertical-align: middle; text-align: center;" |
| style="vertical-align: middle; text-align: center;" |Zero Bytes
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Data Field Length
| style="vertical-align: middle; text-align: center;" |00 00 00 4A
|-
| style="vertical-align: middle; text-align: center;" |Codec ID
| style="vertical-align: middle; text-align: center;" |8E
|-
| style="vertical-align: middle; text-align: center;" |Number of Data 1 (Records)
| style="vertical-align: middle; text-align: center;" |01
|-
| rowspan="25" style="vertical-align: middle; text-align: center;" |AVL Data
| style="vertical-align: middle; text-align: center;" |Timestamp
| style="vertical-align: middle; text-align: center;" |00 00 01 6B 41 2C EE 00 (GMT: Monday, June 10, 2019 11:36:32 AM)
|-
| style="vertical-align: middle; text-align: center;" |Priority
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |Longitude
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Latitude
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Altitude
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Angle
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Satellites
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |Speed
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Event IO ID
| style="vertical-align: middle; text-align: center;" |00 01
|-
| style="vertical-align: middle; text-align: center;" |N of Total ID
| style="vertical-align: middle; text-align: center;" |00 05
|-
| style="vertical-align: middle; text-align: center;" |N1 of One Byte IO
| style="vertical-align: middle; text-align: center;" |00 01
|-
| style="vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |00 01 (AVL ID: 1, Name: DIN1)
|-
| style="vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |N2 of Two Bytes IO
| style="vertical-align: middle; text-align: center;" |00 01
|-
| style="vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |00 11 (AVL ID: 17, Name: Axis X)
|-
| style="vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |00 1D
|-
| style="vertical-align: middle; text-align: center;" |N4 of Four Bytes IO
| style="vertical-align: middle; text-align: center;" |00 01
|-
| style="vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |00 10 (AVL ID: 16, Name: Total Odometer)
|-
| style="vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |01 5E 2C 88
|-
| style="vertical-align: middle; text-align: center;" |N8 of Eight Bytes IO
| style="vertical-align: middle; text-align: center;" |00 02
|-
| style="vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |00 0B (AVL ID: 11, Name: ICCID1)
|-
| style="vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |00 00 00 00 35 44 C8 7A
|-
| style="vertical-align: middle; text-align: center;" |2’nd IO ID
| style="vertical-align: middle; text-align: center;" |00 0E (AVL ID: 14, Name: ICCID2)
|-
| style="vertical-align: middle; text-align: center;" |2’nd IO Value
| style="vertical-align: middle; text-align: center;" |00 00 00 00 1D D7 E0 6A
|-
| style="vertical-align: middle; text-align: center;" |NX of X Byte IO
| style="vertical-align: middle; text-align: center;" |00 00
|-
| rowspan="2" style="vertical-align: middle; text-align: center;" |
| style="vertical-align: middle; text-align: center;" |Number of Data 2 (Number of Total Records)
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |CRC-16
| style="vertical-align: middle; text-align: center;" |00 00 29 94
|-
|} 


Server response: <code>00000001</code> <br> 

*'''<big>Codec8 Extended protocol sending over UDP</big>'''

*'''UDP channel protocol'''

AVL data packet is the same as with Codec8, except Codec ID is changed to <code>0x8E</code>. AVL Data encoding performed according to Codec8 Extended protocol. <br> 

*'''Communication with server'''

Module sends UDP channel packet with encapsulated AVL data packet. Server sends UDP channel packet with encapsulated response module validates AVL Packet ID and Number of accepted AVL elements. If server response with valid AVL Packet ID is not received within configured timeout, module can retry sending. <br>

*Example:

Module sends the data: 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |UDP Channel Header
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Packet Header
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Data Array
|-
| style="vertical-align: middle; text-align: center;" |Length – 0x00FE,
Packet ID – 0xCAFE <br>
Not Usable Byte – 0x01
| style="vertical-align: middle; text-align: center;" |AVL Packet ID – 0xDD,
IMEI Length – 0x000F <br>
IMEI – 0x313233343536373839303132333435
(Encoded using continuous bit stream. Last byte padded to align to byte boundary)
| style="vertical-align: middle; text-align: center;" |Codec ID – 0x8E,
Number of Data – 0x02 <br>
(Encoded using continuous bit stream)
|-
| style="vertical-align: middle; text-align: center;" |00FECAFE01
| style="vertical-align: middle; text-align: center;" |DD000F3133343536373839303132333435
| style="vertical-align: middle; text-align: center;" |8E02…(data elements)…02
|-
|} 


Server must respond with acknowledgment: 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |UDP Channel Header
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Packet Acknowledgment
|-
| style="vertical-align: middle; text-align: center;" |Length – 0x0005,
Packet ID – 0xCAFE,
Not Usable Byte – 0x01
| style="vertical-align: middle; text-align: center;" |AVL Packet ID – 0xDD,
Number of Accepted Data – 0x02
|-
| style="vertical-align: middle; text-align: center;" |0005CAFE01
| style="vertical-align: middle; text-align: center;" |DD02
|-
|} <br />

*'''Example'''

Hexadecimal stream of AVL Data Packet receiving and response in this example are given in hexadecimal form. The different fields of packet are separate into different table columns for better readability and some of them are converted to ASCII values for better understanding. <br> <br>
Received data in hexadecimal stream: <br>
<code>005FCAFE0107000F3335323039333038363430333635358E010000016B4F831C680100000000000000000000000000000000010005000100010100010011009D000100</code>
<code>10015E2C880002000B000000003544C87A000E000000001DD7E06A000001</code> <br> <br>
Parsed: 
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="3" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Data Packet
|-
! colspan="2" rowspan="1" style="width:60%; vertical-align: middle; text-align: center;" |AVL Data Packet Part
! rowspan="1" style="width:40%; vertical-align: middle; text-align: center;" |HEX Code Part
|-
| rowspan="3" style="vertical-align: middle; text-align: center;" |UDP Channel Header
| style="vertical-align: middle; text-align: center;" |Length
| style="vertical-align: middle; text-align: center;" |00 5F
|-
| style="vertical-align: middle; text-align: center;" |Packet ID
| style="vertical-align: middle; text-align: center;" |CA FE
|-
| style="vertical-align: middle; text-align: center;" |Not usable byte
| style="vertical-align: middle; text-align: center;" |01
|-
| rowspan="3" style="vertical-align: middle; text-align: center;" |AVL Packet Header
| style="vertical-align: middle; text-align: center;" |AVL packet ID
| style="vertical-align: middle; text-align: center;" |05
|-
| style="vertical-align: middle; text-align: center;" |IMEI Length
| style="vertical-align: middle; text-align: center;" |00 0F
|-
| style="vertical-align: middle; text-align: center;" |IMEI
| style="vertical-align: middle; text-align: center;" |33 35 32 30 39 33 30 38 36 34 30 33 36 35 35
|-
| rowspan="27" style="vertical-align: middle; text-align: center;" |AVL Data Array
| style="vertical-align: middle; text-align: center;" |Codec ID
| style="vertical-align: middle; text-align: center;" |8E
|-
| style="vertical-align: middle; text-align: center;" |Number of Data 1 (Records)
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |Timestamp
| style="vertical-align: middle; text-align: center;" |00 00 01 6B 4F 83 1C 68 (GMT: Thursday, June 13, 2019 6:25:21 AM)
|-
| style="vertical-align: middle; text-align: center;" |Priority
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |Longitude
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Latitude
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Altitude
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Angle
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Satellites
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |Speed
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Event IO ID
| style="vertical-align: middle; text-align: center;" |00 01
|-
| style="vertical-align: middle; text-align: center;" |N of Total ID
| style="vertical-align: middle; text-align: center;" |00 05
|-
| style="vertical-align: middle; text-align: center;" |N1 of One Byte IO
| style="vertical-align: middle; text-align: center;" |00 01
|-
| style="vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |00 01 (AVL ID: 1, Name: DIN1)
|-
| style="vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |00 01
|-
| style="vertical-align: middle; text-align: center;" |N2 of Two Bytes IO
| style="vertical-align: middle; text-align: center;" |00 01
|-
| style="vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |00 11 (AVL ID: 17, Name: Axis X)
|-
| style="vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |00 1D
|-
| style="vertical-align: middle; text-align: center;" |N4 of Four Bytes IO
| style="vertical-align: middle; text-align: center;" |00 01
|-
| style="vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |00 10 (AVL ID: 16, Name: Total Odometer)
|-
| style="vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |01 5E 2C 88
|-
| style="vertical-align: middle; text-align: center;" |N8 of Eight Bytes IO
| style="vertical-align: middle; text-align: center;" |00 02
|-
| style="vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |00 0B (AVL ID: 11, Name: ICCID1)
|-
| style="vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |00 00 00 00 35 44 C8 7A
|-
| style="vertical-align: middle; text-align: center;" |2’nd IO ID
| style="vertical-align: middle; text-align: center;" |00 0E (AVL ID: 14, Name: ICCID2)
|-
| style="vertical-align: middle; text-align: center;" |2’nd IO Value
| style="vertical-align: middle; text-align: center;" |00 00 00 00 1D D7 E0 6A
|-
| style="vertical-align: middle; text-align: center;" |NX of X Byte IO
| style="vertical-align: middle; text-align: center;" |00 00
|-
|} 


Server response in hexadecimal stream:
<code>0005CAFE010701</code> <br> <br>
Parsed:
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="3" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Server Response to AVL Data Packet
|-
! colspan="2" rowspan="1" style="width:60%; vertical-align: middle; text-align: center;" |Server Response Part
! rowspan="1" style="width:40%; vertical-align: middle; text-align: center;" |HEX Code Part
|-
| rowspan="3" style="vertical-align: middle; text-align: center;" |UDP Channel Header
| style="vertical-align: middle; text-align: center;" |Length
| style="vertical-align: middle; text-align: center;" |00 05
|-
| style="vertical-align: middle; text-align: center;" |Packet ID
| style="vertical-align: middle; text-align: center;" |CA FE
|-
| style="vertical-align: middle; text-align: center;" |Not usable byte
| style="vertical-align: middle; text-align: center;" |01
|-
| rowspan="2" style="vertical-align: middle; text-align: center;" |AVL Packet Acknowledgment
| style="vertical-align: middle; text-align: center;" |AVL packet ID
| style="vertical-align: middle; text-align: center;" |07
|-
| style="vertical-align: middle; text-align: center;" |Number of Accepted Data
| style="vertical-align: middle; text-align: center;" |01
|-
|} <br>

=='''<big>Codec 16</big>'''==

*'''<big>Protocol overview</big>'''

Codec16 is using for FMB630/FM63XY devices. This protocol looks familiar like Codec8 but they have some differences. Main differences between are shown in table below: 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Codec8
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Codec16
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |Codec ID
| style="vertical-align: middle; text-align: center;" |0x08
| style="vertical-align: middle; text-align: center;" |0x10
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |AVL Data IO element ID event length
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |AVL Data IO element AVL ID length
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |Generation Type
| style="vertical-align: middle; text-align: center;" |Not Using
| style="vertical-align: middle; text-align: center;" |Is Using
|-
|} 


'''Note:''' Codec16 is supported from firmware – 00.03.xx and newer. ([[FMB630]]/FM63XY) || AVL ID‘s which are higher than 255 will can be used only in Codec16 protocol. <br>

*'''<big>Codec 16 protocol sending over TCP</big>'''
 
*'''AVL data packet'''

Below table represents AVL data packet structure: 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |0x00000000 (Preamble)
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Data Field Length
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Codec ID
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Number of Data 1
! colspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Data
! rowspan="1" style="width:14%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Number of Data 2
! rowspan="1" style="width:14%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |CRC-16
|-
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |X bytes
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |4 bytes
|-
|}


'''Preamble''' – the packet starts with four zero bytes. <br>
'''Data Field Length''' – size is calculated starting from Codec ID to Number of Data 2. <br>
'''Codec ID''' – in Codec16 it is always 0x10. <br>
'''Number of Data 1''' – a number which defines how many records is in the packet. <br>
'''AVL Data''' – actual data in the packet (more information below). <br>
'''Number of Data 2''' – a number which defines how many records is in the packet. This number must be the same as “Number of Data 1”. <br>
'''CRC-16''' – calculated from Codec ID to the Second Number of Data. CRC (Cyclic Redundancy Check) is an error-detecting code using for detect accidental changes to RAW data. For calculation we are using [[Codec#CRC-16|CRC-16/IBM]].<br> <br>
'''Note:''' for [[FMB630]] and FM63XY, minimum AVL packet size is 45 bytes (all IO elements disabled). Maximum AVL packet size is 255 bytes. <br> 

*AVL Data

Below table represents AVL Data structure: 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Timestamp
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Priority
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |GPS Element
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |IO Element
|-
| style="vertical-align: middle; text-align: center;" |8 bytes
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |15 bytes
| style="vertical-align: middle; text-align: center;" |X bytes
|-
|}


'''Timestamp''' – a difference, in milliseconds, between the current time and midnight, January, 1970 UTC (UNIX time). <br>
'''Priority''' – field which define AVL data priority (more information below). <br>
'''GPS Element''' – location information of the AVL data (more information below). <br>
'''IO Element''' – additional configurable information from device (more information below). <br> 

*Priority

Below table represents Priority values. Packet priority depends on device configuration and records sent. 
{| class="nd-othertables_2" style="width:25%;"
|+
! colspan="2" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Priority
|-
! rowspan="1" style="width:40%; vertical-align: middle; text-align: center;" |0
| style="vertical-align: middle; text-align: center;" |Low
|-
! rowspan="1" style="width:40%; vertical-align: middle; text-align: center;" |1
| style="vertical-align: middle; text-align: center;" |High
|-
! rowspan="1" style="width:40%; vertical-align: middle; text-align: center;" |2
| style="vertical-align: middle; text-align: center;" |Panic
|} <br />

*GPS element

Below table represents GPS Element structure: 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Longitude
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Latitude
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Altitude
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Angle
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Satellites
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Speed
|-
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |2 bytes
| style="vertical-align: middle; text-align: center;" |2 bytes
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
|}


'''Longitude''' – east – west position. <br>
'''Latitude''' – north – south position. <br>
'''Altitude''' – meters above sea level. <br>
'''Angle''' – degrees from north pole. <br>
'''Satellites''' – number of visible satellites. <br>
'''Speed''' – speed calculated from satellites. <br> <br>
'''Note:''' If record are without valid coordinates – (there were no GPS fix in the moment of data acquisition) – Longitude, Latitude and Altitude values are last valid fix, and Angle, Satellites and Speed are 0. <br> <br>
Longitude and latitude are integer values built from degrees, minutes, seconds and milliseconds by formula: <br>
[[Image:GPS.png]]
<br>
Where: <br>
d – Degrees; m – Minutes; s – Seconds; ms – Milliseconds; p – Precision (10000000) <br>
If longitude is in west or latitude in south, multiply result by –1. <br> <br>
Note: <br>
To determine if the coordinate is negative, convert it to binary format and check the very first bit. If it is <code>0</code>, coordinate is positive, if it is <code>1</code>, coordinate is negative. <br> <br>
Example: <br>
Received value: <code>20 9C CA 80</code> converted to BIN: <code>00100000 10011100 11001010 10000000</code> first bit is 0, which means coordinate is positive converted to DEC: <code>547146368</code>. For more information see two‘s complement arithmetic. <br> 

*IO Element

{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |Event IO ID
| style="vertical-align: middle; text-align: center;" |2 bytes
| rowspan="27" style=" width:5%; vertical-align: middle; text-align: left;" |
| rowspan="27" style=" width:65%; vertical-align: middle; text-align: left;" |'''Event IO ID''' – if data is acquired on event – this field defines which IO property has changed and generated an event. For example, when if Ignition state changed and it generate event, Event IO ID will be 0xEF (AVL ID: 239). If it’s not eventual record – the value is 0. <br>
'''Generation type''' - data event generation type. More information about it you can find here. <br>
'''N''' – a total number of properties coming with record (N = N1 + N2 + N4 + N8). <br>
'''N1''' – number of properties, which length is 1 byte. <br>
'''N2''' – number of properties, which length is 2 bytes. <br>
'''N4''' – number of properties, which length is 4 bytes. <br>
'''N8''' – number of properties, which length is 8 bytes. <br>
'''N’th IO ID''' - AVL ID. <br>
'''N’th IO Value''' - AVL ID value. <br> <br>
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |Generation Type
| style="vertical-align: middle; text-align: center;" |1 byte
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N of Total IO
| style="vertical-align: middle; text-align: center;" |1 byte
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N1 of One Byte IO
| style="vertical-align: middle; text-align: center;" |1 byte
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |1 byte
|-
| colspan="2" style="vertical-align: middle; text-align: center;" |...
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N1’th IO ID
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N1’th IO Value
| style="vertical-align: middle; text-align: center;" |1 byte
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N2 of Two Bytes
| style="vertical-align: middle; text-align: center;" |1 byte
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
| colspan="2" style="vertical-align: middle; text-align: center;" |...
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N2’th IO ID
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N2’th IO Value
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N4 of Four Bytes
| style="vertical-align: middle; text-align: center;" |1 byte
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |4 bytes
|-
| colspan="2" style="vertical-align: middle; text-align: center;" |...
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N4’th IO ID
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N4’th IO Value
| style="vertical-align: middle; text-align: center;" |4 byte
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N8 of Eight Bytes
| style="vertical-align: middle; text-align: center;" |1 byte
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |8 byte
|-
| colspan="2" style="vertical-align: middle; text-align: center;" |...
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N8’IO ID
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:15%; vertical-align: middle; text-align: center;" |N8’IO Value
| style="vertical-align: middle; text-align: center;" |8 bytes
|-
|} <br />

*Generation type

{| class="nd-othertables_2" style="width:30%;"
|+
! rowspan="1" style="width:50%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Value
! rowspan="1" style="width:50%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Record Created
|-
| style="vertical-align: middle; text-align: center;" |0
| style="vertical-align: middle; text-align: center;" |On Exit
|-
| style="vertical-align: middle; text-align: center;" |1
| style="vertical-align: middle; text-align: center;" |On Entrance
|-
| style="vertical-align: middle; text-align: center;" |2
| style="vertical-align: middle; text-align: center;" |On Both
|-
| style="vertical-align: middle; text-align: center;" |3
| style="vertical-align: middle; text-align: center;" |Reserved
|-
| style="vertical-align: middle; text-align: center;" |4
| style="vertical-align: middle; text-align: center;" |Hysteresis
|-
| style="vertical-align: middle; text-align: center;" |5
| style="vertical-align: middle; text-align: center;" |On Change
|-
| style="vertical-align: middle; text-align: center;" |6
| style="vertical-align: middle; text-align: center;" |Eventual
|-
| style="vertical-align: middle; text-align: center;" |7
| style="vertical-align: middle; text-align: center;" |Periodical
|-
|} <br />

*'''Communication with server'''

Communication with server is the same as with Codec8 protocol, except in Codec16 protocol Codec ID is <code>0x10</code> and has generation type. <br> 

*Example:

Module connects to server and sends IMEI: <br>
<code>000F333536333037303432343431303133</code> <br>
Server accepts the module: <br>
<code>01</code> <br>
Module sends data packet: 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Data Packet Header
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Data Array
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |CRC-16
|-
| style="vertical-align: middle; text-align: center;" |Four Zero Bytes – 0x00000000,
“AVL Data Array” length – 0x000000FE
| style="vertical-align: middle; text-align: center;" |Codec ID – 0x10,
Number of Data – '''0x02''' <br>
(Encoded using continuous bit stream. Last byte padded to align to byte boundary)
| style="vertical-align: middle; text-align: center;" |CRC of “AVL Data Array”
|-
| style="vertical-align: middle; text-align: center;" |00000000000000FE
| style="vertical-align: middle; text-align: center;" |10'''02'''...(data elements)...'''02'''
| style="vertical-align: middle; text-align: center;" |00008612
|-
|} 


Server acknowledges data reception (2 data elements): '''<code>00000002</code>''' <br> 

*'''Example'''

Hexadecimal stream of AVL Data Packet receiving and response in this example are given in hexadecimal form. The different fields of packet are separate into different table columns for better readability and some of them are converted to ASCII values for better understanding. <br> <br>
Received data in hexadecimal stream: <br>
<code>000000000000005F10020000016BDBC7833000000000000000000000000000000000000B05040200010000030002000B00270042563A00000000016BDBC78718</code>
<code>00000000000000000000000000000000000B05040200010000030002000B00260042563A00000200005FB3</code> <br> <br>
Parsed data: 
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="3" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Data Packet
|-
! colspan="2" rowspan="1" style="width:60%; vertical-align: middle; text-align: center;" |AVL Data Packet Part
! rowspan="1" style="width:40%; vertical-align: middle; text-align: center;" |HEX Code Part
|-
| rowspan="4" style="vertical-align: middle; text-align: center;" |
| style="vertical-align: middle; text-align: center;" |Zero Bytes
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Data Field Length
| style="vertical-align: middle; text-align: center;" |00 00 00 5F
|-
| style="vertical-align: middle; text-align: center;" |Codec ID
| style="vertical-align: middle; text-align: center;" |10
|-
| style="vertical-align: middle; text-align: center;" |Number of Data 1 (Records)
| style="vertical-align: middle; text-align: center;" |02
|-
| rowspan="23" style="vertical-align: middle; text-align: center;" |AVL Data
(1'st record)
| style="vertical-align: middle; text-align: center;" |Timestamp
| style="vertical-align: middle; text-align: center;" |00 00 01 6B DB C7 83 30 (GMT: Wednesday, July 10, 2019 12:06:54 PM)
|-
| style="vertical-align: middle; text-align: center;" |Priority
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |Longitude
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Latitude
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Altitude
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Angle
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Satellites
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |Speed
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Event IO ID
| style="vertical-align: middle; text-align: center;" |00 0B
|-
| style="vertical-align: middle; text-align: center;" |Generation Type
| style="vertical-align: middle; text-align: center;" |05
|-
| style="vertical-align: middle; text-align: center;" |N of Total ID
| style="vertical-align: middle; text-align: center;" |04
|-
| style="vertical-align: middle; text-align: center;" |N1 of One Byte IO
| style="vertical-align: middle; text-align: center;" |02
|-
| style="vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |00 01 (AVL ID: 1, Name: DIN1)
|-
| style="vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |2’nd IO ID
| style="vertical-align: middle; text-align: center;" |00 03 (AVL ID: 3, Name: DIN3)
|-
| style="vertical-align: middle; text-align: center;" |2’nd IO Value
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |N2 of Two Bytes IO
| style="vertical-align: middle; text-align: center;" |02
|-
| style="vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |00 0B (AVL ID: 11, Name: ICCID1)
|-
| style="vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |00 27
|-
| style="vertical-align: middle; text-align: center;" |2’nd IO ID
| style="vertical-align: middle; text-align: center;" |00 42 (AVL ID: 66, Name: External Voltage)
|-
| style="vertical-align: middle; text-align: center;" |2’nd IO Value
| style="vertical-align: middle; text-align: center;" |56 3A
|-
| style="vertical-align: middle; text-align: center;" |N4 of Four Bytes IO
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |N8 of Eight Bytes IO
| style="vertical-align: middle; text-align: center;" |00
|-
| rowspan="23" style="vertical-align: middle; text-align: center;" |AVL Data
(2'nd record)
| style="vertical-align: middle; text-align: center;" |Timestamp
| style="vertical-align: middle; text-align: center;" |00 00 01 6B DB C7 87 18 (GMT: Wednesday, July 10, 2019 12:06:55 PM)
|-
| style="vertical-align: middle; text-align: center;" |Priority
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |Longitude
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Latitude
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Altitude
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Angle
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Satellites
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |Speed
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Event IO ID
| style="vertical-align: middle; text-align: center;" |00 0B
|-
| style="vertical-align: middle; text-align: center;" |Generation Type
| style="vertical-align: middle; text-align: center;" |05
|-
| style="vertical-align: middle; text-align: center;" |N of Total ID
| style="vertical-align: middle; text-align: center;" |04
|-
| style="vertical-align: middle; text-align: center;" |N1 of One Byte IO
| style="vertical-align: middle; text-align: center;" |02
|-
| style="vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |00 01 (AVL ID: 1, Name: DIN1)
|-
| style="vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |2’nd IO ID
| style="vertical-align: middle; text-align: center;" |00 03 (AVL ID: 3, Name: DIN3)
|-
| style="vertical-align: middle; text-align: center;" |2’nd IO Value
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |N2 of Two Bytes IO
| style="vertical-align: middle; text-align: center;" |02
|-
| style="vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |00 0B (AVL ID: 11, Name: ICCID1)
|-
| style="vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |00 26
|-
| style="vertical-align: middle; text-align: center;" |2’nd IO ID
| style="vertical-align: middle; text-align: center;" |00 42 (AVL ID: 66, Name: External Voltage)
|-
| style="vertical-align: middle; text-align: center;" |2’nd IO Value
| style="vertical-align: middle; text-align: center;" |56 3A
|-
| style="vertical-align: middle; text-align: center;" |N4 of Four Bytes IO
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |N8 of Eight Bytes IO
| style="vertical-align: middle; text-align: center;" |00
|-
| rowspan="2" style="vertical-align: middle; text-align: center;" |
| style="vertical-align: middle; text-align: center;" |Number of Data 2 (Number of Total Records)
| style="vertical-align: middle; text-align: center;" |02
|-
| style="vertical-align: middle; text-align: center;" |CRC-16
| style="vertical-align: middle; text-align: center;" |00 00 5F B3
|-
|} 


Server response: <code>00000002</code> <br> 

*'''<big>Codec16 protocol sending over UDP</big>'''
*'''UDP channel protocol'''

AVL data packet is the same as with Codec8, except Codec ID is changed to <code>0x10</code>. AVL Data encoding performed according to Codec16 protocol. <br>

*'''Communication with server'''

Module sends UDP channel packet with encapsulated AVL data packet. Server sends UDP channel packet with encapsulated response module validates AVL Packet ID and Number of accepted AVL elements. If server response with valid AVL Packet ID is not received within configured timeout, module can retry sending. <br>

*Example:

Module sends the data: 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |UDP Channel Header
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Packet Header
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Data Array
|-
| style="vertical-align: middle; text-align: center;" |Length – 0x00FE,
Packet ID – 0xCAFE <br>
Not Usable Byte – 0x01
| style="vertical-align: middle; text-align: center;" |AVL Packet ID – 0xDD,
IMEI Length – 0x000F <br>
IMEI – 0x313233343536373839303132333435
(Encoded using continuous bit stream. Last byte padded to align to byte boundary)
| style="vertical-align: middle; text-align: center;" |Codec ID – 0x10,
Number of Data – 0x02 <br>
(Encoded using continuous bit stream)
|-
| style="vertical-align: middle; text-align: center;" |00FECAFE01
| style="vertical-align: middle; text-align: center;" |DD000F3133343536373839303132333435
| style="vertical-align: middle; text-align: center;" |1002…(data elements)…02
|-
|} 


Server must respond with acknowledgment:
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |UDP Channel Header
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Packet Acknowledgment
|-
| style="vertical-align: middle; text-align: center;" |Length – 0x0005,
Packet ID – 0xCAFE,
Not Usable Byte – 0x01
| style="vertical-align: middle; text-align: center;" |AVL Packet ID – 0xDD,
Number of Accepted Data – 0x02
|-
| style="vertical-align: middle; text-align: center;" |0005CAFE01
| style="vertical-align: middle; text-align: center;" |DD02
|-
|} <br />

*'''Example'''

Hexadecimal stream of AVL Data Packet receiving and response in this example are given in hexadecimal form. The different fields of packet are separate into different table columns for better readability and some of them are converted to ASCII values for better understanding. <br> <br>
Received data in hexadecimal stream: <br>
<code>015BCAFE0101000F33353230393430383532333135393210070000015117E40FE80000000000000000000000000000000000EF05050400010000030000B4000</code>
<code>0EF01010042111A000001</code> <br> <br>
Parsed: 
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="3" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |AVL Data Packet
|-
! colspan="2" rowspan="1" style="width:60%; vertical-align: middle; text-align: center;" |AVL Data Packet Part
! rowspan="1" style="width:40%; vertical-align: middle; text-align: center;" |HEX Code Part
|-
| rowspan="3" style="vertical-align: middle; text-align: center;" |UDP Channel Header
| style="vertical-align: middle; text-align: center;" |Length
| style="vertical-align: middle; text-align: center;" |01 5B
|-
| style="vertical-align: middle; text-align: center;" |Packet ID
| style="vertical-align: middle; text-align: center;" |CA FE
|-
| style="vertical-align: middle; text-align: center;" |Not usable byte
| style="vertical-align: middle; text-align: center;" |01
|-
| rowspan="3" style="vertical-align: middle; text-align: center;" |AVL Packet Header
| style="vertical-align: middle; text-align: center;" |AVL packet ID
| style="vertical-align: middle; text-align: center;" |07
|-
| style="vertical-align: middle; text-align: center;" |IMEI Length
| style="vertical-align: middle; text-align: center;" |00 0F
|-
| style="vertical-align: middle; text-align: center;" |IMEI
| style="vertical-align: middle; text-align: center;" |33 35 32 30 39 34 30 38 35 32 33 31 35 39 32
|-
| rowspan="28" style="vertical-align: middle; text-align: center;" |AVL Data Array
| style="vertical-align: middle; text-align: center;" |Codec ID
| style="vertical-align: middle; text-align: center;" |10
|-
| style="vertical-align: middle; text-align: center;" |Number of Data 1 (Records)
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |Timestamp
| style="vertical-align: middle; text-align: center;" |00 00 01 51 17 E4 0F E8 (GMT: Wednesday, November 18, 2015 12:00:01 AM)
|-
| style="vertical-align: middle; text-align: center;" |Priority
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |Longitude
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Latitude
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Altitude
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Angle
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Satellites
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |Speed
| style="vertical-align: middle; text-align: center;" |00 00
|-
| style="vertical-align: middle; text-align: center;" |Event IO ID
| style="vertical-align: middle; text-align: center;" |00 EF
|-
| style="vertical-align: middle; text-align: center;" |Generation type
| style="vertical-align: middle; text-align: center;" |05
|-
| style="vertical-align: middle; text-align: center;" |N of Total ID
| style="vertical-align: middle; text-align: center;" |05
|-
| style="vertical-align: middle; text-align: center;" |N1 of One Byte IO
| style="vertical-align: middle; text-align: center;" |04
|-
| style="vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |00 01 (AVL ID: 1, Name: DIN1)
|-
| style="vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |2’nd IO ID
| style="vertical-align: middle; text-align: center;" |00 03 (AVL ID: 3, Name: DIN3)
|-
| style="vertical-align: middle; text-align: center;" |2’nd IO Value
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |3’rd IO ID
| style="vertical-align: middle; text-align: center;" |00 B4 (AVL ID: 180, Name: DOUT2)
|-
| style="vertical-align: middle; text-align: center;" |3’rd IO Value
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |4’th IO ID
| style="vertical-align: middle; text-align: center;" |00 EF (AVL ID: 239, Name: Ignition)
|-
| style="vertical-align: middle; text-align: center;" |4’th IO Value
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |N2 of Two Bytes IO
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |1’st IO ID
| style="vertical-align: middle; text-align: center;" |42 (AVL ID: 66, Name: External Voltage)
|-
| style="vertical-align: middle; text-align: center;" |1’st IO Value
| style="vertical-align: middle; text-align: center;" |11 1A
|-
| style="vertical-align: middle; text-align: center;" |N4 of Four Bytes IO
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |N8 of Eight Bytes IO
| style="vertical-align: middle; text-align: center;" |00
|-
| style="vertical-align: middle; text-align: center;" |Number of Data 2 (Number of Total Records)
| style="vertical-align: middle; text-align: center;" |01
|-
|} 


Server response in hexadecimal stream:
<code>0005CAFE010701</code> <br> <br>
Parsed:
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="3" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Server Response to AVL Data Packet
|-
! colspan="2" rowspan="1" style="width:60%; vertical-align: middle; text-align: center;" |Server Response Part
! rowspan="1" style="width:40%; vertical-align: middle; text-align: center;" |HEX Code Part
|-
| rowspan="3" style="vertical-align: middle; text-align: center;" |UDP Channel Header
| style="vertical-align: middle; text-align: center;" |Length
| style="vertical-align: middle; text-align: center;" |00 05
|-
| style="vertical-align: middle; text-align: center;" |Packet ID
| style="vertical-align: middle; text-align: center;" |CA FE
|-
| style="vertical-align: middle; text-align: center;" |Not usable byte
| style="vertical-align: middle; text-align: center;" |01
|-
| rowspan="2" style="vertical-align: middle; text-align: center;" |AVL Packet Acknowledgment
| style="vertical-align: middle; text-align: center;" |AVL packet ID
| style="vertical-align: middle; text-align: center;" |07
|-
| style="vertical-align: middle; text-align: center;" |Number of Accepted Data
| style="vertical-align: middle; text-align: center;" |01
|-
|} <br />

=='''<big>Differences between Codec 8, Codec 8 Extended and Codec 16</big>'''==
In the table below you will see differences between Codec8, Codec8 Extended and Codec16. 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Codec8
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Codec8 Extended
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Codec16
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |Codec ID
| style="vertical-align: middle; text-align: center;" |0x08
| style="vertical-align: middle; text-align: center;" |0x8E
| style="vertical-align: middle; text-align: center;" |0x10
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |AVL Data IO element length
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |2 bytes
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |AVL Data IO element total IO count length
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |2 bytes
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |Generation Type
| style="vertical-align: middle; text-align: center;" |Not Using
| style="vertical-align: middle; text-align: center;" |Not Using
| style="vertical-align: middle; text-align: center;" |Is Using
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |AVL Data IO element IO count length
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |2 bytes
| style="vertical-align: middle; text-align: center;" |1 byte
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |AVL Data IO element AVL ID length
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |2 bytes
| style="vertical-align: middle; text-align: center;" |2 bytes
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |Variable size IO elements
| style="vertical-align: middle; text-align: center;" |Does not include
| style="vertical-align: middle; text-align: center;" |Includes variable size elements
| style="vertical-align: middle; text-align: center;" |Does not include
|-
|} <br />

='''<big>Codec for communication over GPRS messages</big>'''=
In this chapter you will find information about every Codec protocol which are using for communication over GPRS messages and differences between them. 

=='''<big>Codec 12</big>'''==

*'''<big>About Codec12</big>'''

Codec12 is the original and main Teltonika protocol for device-server communication over GPRS messages. Codec12 GPRS commands can be used for sending configuration, debug, digital outputs control commands or other (special purpose command on special firmware versions). This protocol is also necessary for using [[FMB630]]/[[FM6300]]/FM5300/FM5500/FM4200 features like: Garmin, LCD communication, COM TCP Link Mode. <br> 

*'''<big>FM firmware requirements</big>'''

Supported GPRS commands on each device depending on the firmware version. For available GPRS commands on each device, please refer to the table below. 
{| class="nd-othertables" style="width:75%;"
|+
! rowspan="1" style="width:25%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Device
! rowspan="1" style="width:25%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |SMS over GPRS via TCP
! rowspan="1" style="width:25%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |SMS over GPRS via UDP
|-
| style="vertical-align: middle; text-align: left;" |FM36YX
| style="vertical-align: middle; text-align: center;" |Available in base firmware
| style="vertical-align: middle; text-align: center;" |Since base firmware 01.06.01
|-
| style="vertical-align: middle; text-align: left;" |FM63YX
| style="vertical-align: middle; text-align: center;" |Available in base firmware
| style="vertical-align: middle; text-align: center;" |Since base firmware 00.02.19
|-
| style="vertical-align: middle; text-align: left;" |FMB, FMC, FMM, FMU family devices (exclude FMB6YX, [[FMC640]], [[FMM640]])
| style="vertical-align: middle; text-align: center;" |Available in base firmware
| style="vertical-align: middle; text-align: center;" |Available in base firmware
|-
| style="vertical-align: middle; text-align: left;" |FMB6YX
| style="vertical-align: middle; text-align: center;" |Available in base firmware
| style="vertical-align: middle; text-align: center;" |Since base firmware 00.02.19
|-
| style="vertical-align: middle; text-align: left;" |[[FMC640]], [[FMM640]]
| style="vertical-align: middle; text-align: center;" |Available in base firmware
| style="vertical-align: middle; text-align: center;" |Available in base firmware
|-
|} <br />
'''Note:''' “SMS over GPRS” means that all standard SMS commands text can be sent to the device via GPRS in Codec12 format.  

*'''<big>GPRS command session</big>'''

The following figure shows how the GRPS command session is started over TCP. <br>
[[File:Codec12.png|1150px]]
First, the Teltonika device opens the GPRS session and sends AVL data to the server (refer device protocols). Once all records are sent and correct sent data array acknowledgment is received by device then GPRS commands in Hex can be sent to the device. <br>
The ACK (acknowledge of IMEI from server) is a one-byte constant 0x01. The acknowledgment of each data array send from the device is four bytes integer – the number of records received. <br>
Note, that the GPRS session should remain active between device and server, while GPRS commands are sent. For this reason, active datalink timeout (global parameters in device configuration) is recommended to be set to 259200 (maximum value). <br> 

*'''<big>General Codec12 message structure</big>'''

The following diagram shows basic structure of Codec12 messages. <br> <br>
'''Command message structure:''' 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |0x00000000 (Preamble)
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Data Size
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Codec ID
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Command Quantity 1
! colspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Type (0x05)
! rowspan="1" style="width:14%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Command Size
! rowspan="1" style="width:14%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Command
! rowspan="1" style="width:14%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Command Quantity 2
! rowspan="1" style="width:14%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |CRC-16
|-
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |X bytes
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |4 bytes
|-
|} 


'''Response message structure:''' 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |0x00000000 (Preamble)
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Data Size
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Codec ID
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Response Quantity 1
! colspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Type (0x06)
! rowspan="1" style="width:14%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Response Size
! rowspan="1" style="width:14%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Response
! rowspan="1" style="width:14%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Response Quantity 2
! rowspan="1" style="width:14%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |CRC-16
|-
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |X bytes
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |4 bytes
|-
|}


'''Preamble''' - the packet starts with four zero bytes. <br>
'''Data Size''' - size is calculated from Codec ID field to the second command or response quantity field. <br>
'''Codec ID''' - in Codec12 it is always <code>0x0C</code>. <br>
'''Command/Response Quantity 1''' - it is ignored when parsing the message. <br>
'''Type''' - it can be 0x05 to denote command or 0x06 to denote response. <br>
'''Command/Response Size''' – command or response length. <br>
'''Command/Response''' – command or response in HEX. <br>
'''Command/Response Quantity 2''' - a byte which defines how many records (commands or responses) is in the packet. This byte will not be parsed but it’s recommended that it should contain same value as Command/Response Quantity 1. <br>
'''CRC-16''' – calculated from Codec ID to the Command Quantity 2. CRC (Cyclic Redundancy Check) is an error-detecting code using for detect accidental changes to RAW data. For calculation we are using [[Codec#CRC-16|CRC-16/IBM]].<br> <br>
Note that difference between commands and responses is message type field: <code>0x05</code> means command and <code>0x06</code> means response. <br>

*'''<big>Command coding table</big>'''

Command has to be converted from ASCII characters (char) to hexadecimal (HEX): <br>
[[File:ASCII.png]] <br> 

*'''<big>Command parsing example</big>'''

Hexadecimal stream of command and answer in this example is given in hexadecimal form. The different fields of the message are separated into different table columns for better readability and understanding. <br> 

*'''<big>GPRS commands examples</big>'''

Hexadecimal stream of GPRS command and answer in these examples are given in hexadecimal form. The different fields of messages are separate into different table columns for better readability and some of them are converted to ASCII values for better understanding. <br> <br>
'''1'st example:''' Sending ''[[FMB getinfo|getinfo]]'' SMS command via GPRS Codec12 <br> <br>
Server request in hexadecimal stream: <br>
<code>000000000000000F0C010500000007676574696E666F0100004312</code> <br> <br>
Parsed: 
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="2" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Server Command
|-
! rowspan="1" style="width:14%; vertical-align: middle; text-align: center;" |Server Command Part
! rowspan="1" style="width:14%; vertical-align: middle; text-align: center;" |HEX Code Part
|-
| style="vertical-align: middle; text-align: center;" |Zero Bytes
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Data Size
| style="vertical-align: middle; text-align: center;" |00 00 00 0F
|-
| style="vertical-align: middle; text-align: center;" |Codec ID
| style="vertical-align: middle; text-align: center;" |0C
|-
| style="vertical-align: middle; text-align: center;" |Command Quantity 1
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |Command Type
| style="vertical-align: middle; text-align: center;" |05
|-
| style="vertical-align: middle; text-align: center;" |Command Size
| style="vertical-align: middle; text-align: center;" |00 00 00 07
|-
| style="vertical-align: middle; text-align: center;" |Command
| style="vertical-align: middle; text-align: center;" |67 65 74 69 6E 66 6F
|-
| style="vertical-align: middle; text-align: center;" |Command Quantity 2
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |CRC-16
| style="vertical-align: middle; text-align: center;" |00 00 43 12
|-
|} 


Note that Server Command converted from HEX to ASCII means ''[[FMB getinfo|getinfo]]'' <br> <br>
Device response in hexadecimal stream:  <br>
<code>00000000000000900C010600000088494E493A323031392F372F323220373A3232205254433A323031392F372F323220373A3533205253543A32204552523A</code>
<code>312053523A302042523A302043463A302046473A3020464C3A302054553A302F302055543A3020534D533A30204E4F4750533A303A3330204750533A312053</code>
<code>41543A302052533A332052463A36352053463A31204D443A30010000C78F</code> <br> <br>
Parsed: 
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="2" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Device Answer
|-
! rowspan="1" style="width:50%; vertical-align: middle; text-align: center;" |Device Answer Part
! rowspan="1" style="width:50%; vertical-align: middle; text-align: center;" |HEX Code Part
|-
| style="vertical-align: middle; text-align: center;" |Zero Bytes
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Data Size
| style="vertical-align: middle; text-align: center;" |00 00 00 90
|-
| style="vertical-align: middle; text-align: center;" |Codec ID
| style="vertical-align: middle; text-align: center;" |0C
|-
| style="vertical-align: middle; text-align: center;" |Response Quantity 1
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |Response Type
| style="vertical-align: middle; text-align: center;" |06
|-
| style="vertical-align: middle; text-align: center;" |Response Size
| style="vertical-align: middle; text-align: center;" |00 00 00 88
|-
| style="vertical-align: middle; text-align: center;" |Response
| style="vertical-align: middle; text-align: center;" |49 4E 49 3A 32 30 31 39 2F 37 2F 32 32 20 37 3A 32 32 20 52 54 43 3A 32 30 31 39 2F 37 2F 32 32 20 37 3A 35 33 20 52 53 54 3A 32 20 45 52 52 3A 31 20 53 52 3A 30 20 42 52 3A 30 20 43 46 3A 30 20 46 47 3A 30 20 46 4C 3A 30 20 54 55 3A 30 2F 30 20 55 54 3A 30 20 53 4D 53 3A 30 20 4E 4F 47 50 53 3A 30 3A 33 30 20 47 50 53 3A 31 20 53 41 54 3A 30 20 52 53 3A 33 20 52 46 3A 36 35 20 53 46 3A 31 20 4D 44 3A 30
|-
| style="vertical-align: middle; text-align: center;" |Response Quantity 2
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |CRC-16
| style="vertical-align: middle; text-align: center;" |00 00 C7 8F
|-
|} <br>
Note that Device Response converted from HEX to ASCII means: <br>
''INI:2019/7/22 7:22 RTC:2019/7/22 7:53 RST:2 ERR:1 SR:0 BR:0 CF:0 FG:0 FL:0 TU:0/0 UT:0 SMS:0 NOGPS:0:30 GPS:1 SAT:0 RS:3 RF:65 SF:1 MD:0'' <br>

'''2'nd example:''' Sending ''[[FMB getio|getio]]'' SMS command via GPRS Codec12 <br><br>
Server request in hexadecimal stream: <br>
<code>000000000000000D0C010500000005676574696F01000000CB</code> <br> <br>
Parsed: 
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="2" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Server Command
|-
! rowspan="1" style="width:50%; vertical-align: middle; text-align: center;" |Server Command Part
! rowspan="1" style="width:50%; vertical-align: middle; text-align: center;" |HEX Code Part
|-
| style="vertical-align: middle; text-align: center;" |Zero Bytes
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Data Size
| style="vertical-align: middle; text-align: center;" |00 00 00 0D
|-
| style="vertical-align: middle; text-align: center;" |Codec ID
| style="vertical-align: middle; text-align: center;" |0C
|-
| style="vertical-align: middle; text-align: center;" |Command Quantity 1
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |Command Type
| style="vertical-align: middle; text-align: center;" |05
|-
| style="vertical-align: middle; text-align: center;" |Command Size
| style="vertical-align: middle; text-align: center;" |00 00 00 05
|-
| style="vertical-align: middle; text-align: center;" |Command
| style="vertical-align: middle; text-align: center;" |67 65 74 69 6F
|-
| style="vertical-align: middle; text-align: center;" |Command Quantity 2
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |CRC-16
| style="vertical-align: middle; text-align: center;" |00 00 00 CB
|-
|} 


Note that Server Command converted from HEX to ASCII means ''[[FMB getio|getio]]'' <br> <br>
Device response in hexadecimal stream:  <br>
<code>00000000000000370C01060000002F4449313A31204449323A30204449333A302041494E313A302041494E323A313639323420444F313A3020444F323A3101000066E3</code> <br> <br>
Parsed: 
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="2" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Device Answer
|-
! rowspan="1" style="width:50%; vertical-align: middle; text-align: center;" |Device Answer Part
! rowspan="1" style="width:50%; vertical-align: middle; text-align: center;" |HEX Code Part
|-
| style="vertical-align: middle; text-align: center;" |Zero Bytes
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Data Size
| style="vertical-align: middle; text-align: center;" |00 00 00 37
|-
| style="vertical-align: middle; text-align: center;" |Codec ID
| style="vertical-align: middle; text-align: center;" |0C
|-
| style="vertical-align: middle; text-align: center;" |Response Quantity 1
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |Response Type
| style="vertical-align: middle; text-align: center;" |06
|-
| style="vertical-align: middle; text-align: center;" |Response Size
| style="vertical-align: middle; text-align: center;" |00 00 00 2F
|-
| style="vertical-align: middle; text-align: center;" |Response
| style="vertical-align: middle; text-align: center;" |44 49 31 3A 31 20 44 49 32 3A 30 20 44 49 33 3A 30 20 41 49 4E 31 3A 30 20 41 49 4E 32 3A 31 36 39 32 34 20 44 4F 31 3A 30 20 44 4F 32 3A 31
|-
| style="vertical-align: middle; text-align: center;" |Response Quantity 2
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |CRC-16
| style="vertical-align: middle; text-align: center;" |00 00 66 E3
|-
|} 


Note that Device Response converted from HEX to ASCII means: <br>
''DI1:1 DI2:0 DI3:0 AIN1:0 AIN2:16924 DO1:0 DO2:1'' <br> 

*'''<big>Communication with server</big>'''

The GSM/GPRS commands can be sent from a terminal program. We recommend to use Hercules (in TCP server mode). Simply write command as explained below into Hercules Send field, check HEX box and click Send button. Note that the TCP server must be listening on specified port (see Port field and Listen button below). 

[[File:Hercules.jpeg]]
<br> 

*'''<big>FMXX and Codec12 functionality</big>'''
*'''Garmin'''

All information is provided in “FMXX and Garmin development.pdf” document. <br> 

*'''COM TCP Link Mode'''

All information is provided in “FMxx TCP Link mode test instructions.pdf” document.

=='''<big>Codec 13</big>'''==

*'''<big>About Codec13</big>'''

Codec13 is original Teltonika protocol for device-server communication over GPRS messages. This protocol is necessary for using following FM features: COM TCP Link Mode (binary/ASCII/binary buffered/ASCII buffered) if message timestamp parameter is enabled in device configuration. Codec13 messages are one way only (Device → Server sending).<br>

*'''<big>General Codec13 message structure</big>'''

The following diagram shows basic structure of Codec 13 messages: 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |0x00000000 (Preamble)
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Data Size
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Codec ID
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Response Quantity 1
! colspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Type
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Response Size
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Timestamp
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Response
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Response Quantity 2
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |CRC-16
|-
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |X bytes
| style="vertical-align: middle; text-align: center;" |1 byte
| style="vertical-align: middle; text-align: center;" |4 bytes
|-
|}


'''Preamble''' – the packet starts with preamble field (four zero bytes). <br>
'''Data Size''' – size is calculated from Codec ID field to the second Response Quantity field. <br>
'''Codec ID''' – in Codec13 it is always <code>0x0D</code>. <br>
'''Response Quantity 1''' – <code>0x01</code>, it is ignored when parsing the message. <br>
'''Response Type''' – it is always <code>0x06</code> since the packet is direction is FM->Server. <br>
'''Response Size''' – response size field includes size of timestamp too, so it is equal to size of payload + size of timestamp. <br>
'''Timestamp''' – a difference, in seconds, between the current time and midnight, January, 1970 UTC (UNIX time). <br>
'''Response''' – actual received data. <br>
'''Response Quantity 2''' – a byte which defines how many records (responses) is in the packet. This byte will not be parsed but it’s recommended that it should contain same value as Response Quantity 1. <br>
'''CRC-16''' – calculated from Codec ID to the Second Number of Data. CRC (Cyclic Redundancy Check) is an error-detecting code using for detect accidental changes to RAW data. For calculation we are using [[Codec#CRC-16|CRC-16/IBM]].<br> <br>
'''Note:''' Codec13 packets are used only when “Message Timestamp” parameter in RS232 settings is enabled. <br> 

*'''<big>Command parsing example</big>'''

Hexadecimal stream of GPRS command in this example is given in hexadecimal form. The different fields of message are separate into different table columns for better readability and some of them are converted to ASCII values for better understanding. <br> <br>
Receiving "hello lets test" SMS response via GPRS Codec13<br> <br>
Hexadecimal stream: <br>
<code>000000000000001D0D01060000001564E8328168656C6C6F206C65747320746573740D0A0100003548</code> <br> <br>
Parsed: 
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="2" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Device answer
|-
! rowspan="1" style="width:50%; vertical-align: middle; text-align: center;" |Device answer part
! rowspan="1" style="width:50%; vertical-align: middle; text-align: center;" |HEX Code Part
|-
| style="vertical-align: middle; text-align: center;" |Zero Bytes
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Data Size
| style="vertical-align: middle; text-align: center;" |00 00 00 1D
|-
| style="vertical-align: middle; text-align: center;" |Codec ID
| style="vertical-align: middle; text-align: center;" |0D
|-
| style="vertical-align: middle; text-align: center;" |Response Quantity 1
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |Response Type
| style="vertical-align: middle; text-align: center;" |06
|-
| style="vertical-align: middle; text-align: center;" |Response Size
| style="vertical-align: middle; text-align: center;" |00 00 00 15
|-
| style="vertical-align: middle; text-align: center;" |Timestamp
| style="vertical-align: middle; text-align: center;" |64 E8 32 81
|-
| style="vertical-align: middle; text-align: center;" |Response
| style="vertical-align: middle; text-align: center;" |68 65 6C 6C 6F 20 6C 65 74 73 20 74 65 73 74 0D 0A
|-
| style="vertical-align: middle; text-align: center;" |Response Quantity 2
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |CRC-16
| style="vertical-align: middle; text-align: center;" |00 00 35 48
|-
|} 


Note that Server Response converted from HEX to ASCII means "hello lets test"

=='''<big>Codec 14</big>'''==

*'''<big>About Codec14</big>'''

Codec14 is original Teltonika protocol for device-server communication over GPRS messages and it is based on Codec12 protocol. <br>
Main difference of Codec14 is that, device will answer to GPRS command if device physical IMEI number matches specified IMEI number in GPRS command. <br>

Codec14 GPRS commands can be used for sending configuration, debug, digital outputs control commands or other (special purpose command on special firmware versions). <br> 

*'''<big>FMB firmware requirements</big>'''

Implemented in base firmware from FMB.Ver.03.25.04.Rev.00 and newer. <br> 

*'''<big>General Codec14 message structure</big>'''

The following diagram shows basic structure of Codec14 messages. <br> 

'''Command message structure'''
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |0x00000000 (preamble)
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Data size
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |0x0E (Codec ID)
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Command quantity
! colspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |0x05<br>(Message type)
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Command size + IMEI size (8 bytes)
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |IMEI (HEX)
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Command
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Command quantity
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |CRC-16
|-
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |1 bytes
| style="vertical-align: middle; text-align: center;" |1 bytes
| style="vertical-align: middle; text-align: center;" |1 bytes
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |8 bytes
| style="vertical-align: middle; text-align: center;" |X bytes
| style="vertical-align: middle; text-align: center;" |1 bytes
| style="vertical-align: middle; text-align: center;" |4 bytes
|-
|} 


'''Response message structure'''
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |0x00000000 (preamble)
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Data size
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |0x0E (Codec ID)
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Response quantity
! colspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |0x06 / 0x11 (Message type)
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Response size + IMEI size (8 bytes)
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |IMEI (HEX)
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Response
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Response quantity
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |CRC-16
|-
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |1 bytes
| style="vertical-align: middle; text-align: center;" |1 bytes
| style="vertical-align: middle; text-align: center;" |1 bytes
| style="vertical-align: middle; text-align: center;" |4 bytes
| style="vertical-align: middle; text-align: center;" |8 bytes
| style="vertical-align: middle; text-align: center;" |X bytes
| style="vertical-align: middle; text-align: center;" |1 bytes
| style="vertical-align: middle; text-align: center;" |4 bytes
|-
|}


'''Preamble''' – the packet starts with four zero bytes. <br>
'''Data Size''' – size is calculated from Codec ID field to the second command or response quantity field. <br>
'''Codec ID''' – in Codec14 it is always <code>0x0E</code>. <br>
'''Command/Response Quantity 1''' – it is ignored when parsing the message. <br>
'''Type''' – if it is request command from server it has to contain 0x05. The response type field will contain <code>0x06</code> if it’s ACK or <code>0x11</code> if it’s nACK. <br>
''Explanation:'' If command message IMEI is equal to actual device IMEI, received command will be executed and response will be sent with ACK (<code>0x06</code>) message type field value. If command message IMEI doesn’t match actual device IMEI, received command won’t be executed and response to server will be sent with nACK (<code>0x11</code>) message type field value. <br>
'''Command/Response Size''' – command or response length. <br>
''Note:'' make sure that size is IMEI size 8 + actual command size. Minimal value is 8 because Codec14 always contain IMEI and it’s 8 bytes. <br>
'''IMEI (HEX)''' – it is send as HEX value. Example if device IMEI is 123456789123456 then IMEI data field will contain <code>0x0123456789123456</code> value. <br>
'''Command/Response''' – command or response in HEX. <br>
'''Command/Response Quantity 2''' - a byte which defines how many records (commands or responses) is in the packet. This byte will not be parsed but it’s recommended that it should contain same value as Command/Response Quantity 1. <br>'''CRC-16''' – calculated from Codec ID to the Second Number of Data. CRC (Cyclic Redundancy Check) is an error-detecting code using for detect accidental changes to RAW data. For calculation we are using [[Codec#CRC-16|CRC-16/IBM]].<br>

*'''<big>GPRS in Codec14 examples</big>'''

Hexadecimal stream of GPRS command and answer in this example are given in hexadecimal form. The different fields of message are separate into different table columns for better readability and some of them are converted to ASCII values for better understanding. <br> <br>
Sending ''[[FMB getver|getver]]'' SMS command via GPRS Codec14: <br> <br>
Server requests in Hexadecimal stream: <br>
<code>00000000000000160E01050000000E0352093081452251676574766572010000D2C1</code> <br> <br>
Parsed: 
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="2" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Server Command
|-
! rowspan="1" style="width:50%; vertical-align: middle; text-align: center;" |Server Command Part
! rowspan="1" style="width:50%; vertical-align: middle; text-align: center;" |HEX Code Part
|-
| style="vertical-align: middle; text-align: center;" |Zero Bytes
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Data Size
| style="vertical-align: middle; text-align: center;" |00 00 00 16
|-
| style="vertical-align: middle; text-align: center;" |Codec ID
| style="vertical-align: middle; text-align: center;" |0E
|-
| style="vertical-align: middle; text-align: center;" |Command Quantity 1
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |Command Type
| style="vertical-align: middle; text-align: center;" |05
|-
| style="vertical-align: middle; text-align: center;" |Command Size
| style="vertical-align: middle; text-align: center;" |00 00 00 0E
|-
| style="vertical-align: middle; text-align: center;" |IMEI
| style="vertical-align: middle; text-align: center;" |03 52 09 30 81 45 22 51
|-
| style="vertical-align: middle; text-align: center;" |Command
| style="vertical-align: middle; text-align: center;" |67 65 74 76 65 72
|-
| style="vertical-align: middle; text-align: center;" |Command Quantity 2
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |CRC-16
| style="vertical-align: middle; text-align: center;" |00 00 D2 C1
|-
|} 


Note that Server Command converted from HEX to ASCII means ''[[FMB getver|getver]]'' <br> <br>
Device ACK response in hexadecimal stream: <br>
<code>00000000000000AB0E0106000000A303520930814522515665723A30332E31382E31345F3034204750533A41584E5F352E31305F333333332048773A464D42313230</code>
<code>204D6F643A313520494D45493A33353230393330383134353232353120496E69743A323031382D31312D323220373A313320557074696D653A3137323334204D4143</code>
<code>3A363042444430303136323631205350433A312830292041584C3A30204F42443A3020424C3A312E362042543A340100007AAE</code> <br> <br>
Parsed: 
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="2" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Device Answer
|-
! rowspan="1" style="width:50%; vertical-align: middle; text-align: center;" |Device Answer Part
! rowspan="1" style="width:50%; vertical-align: middle; text-align: center;" |HEX Code Part
|-
| style="vertical-align: middle; text-align: center;" |Zero Bytes
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Data Size
| style="vertical-align: middle; text-align: center;" |00 00 00 37
|-
| style="vertical-align: middle; text-align: center;" |Codec ID
| style="vertical-align: middle; text-align: center;" |0E
|-
| style="vertical-align: middle; text-align: center;" |Response Quantity 1
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |Response Type
| style="vertical-align: middle; text-align: center;" |06
|-
| style="vertical-align: middle; text-align: center;" |Response Size
| style="vertical-align: middle; text-align: center;" |00 00 00 A3
|-
| style="vertical-align: middle; text-align: center;" |IMEI
| style="vertical-align: middle; text-align: center;" |03 52 09 30 81 45 22 51
|-
| style="vertical-align: middle; text-align: center;" |Response
| style="vertical-align: middle; text-align: center;" |56 65 72 3A 30 33 2E 31 38 2E 31 34 5F 30 34 20 47 50 53 3A 41 58 4E 5F 35 2E 31 30 5F 33 33 33 33 20 48 77 3A 46 4D 42 31 32 30 20 4D 6F 64 3A 31 35 20 49 4D 45 49 3A 33 35 32 30 39 33 30 38 31 34 35 32 32 35 31 20 49 6E 69 74 3A 32 30 31 38 2D 31 31 2D 32 32 20 37 3A 31 33 20 55 70 74 69 6D 65 3A 31 37 32 33 34 20 4D 41 43 3A 36 30 42 44 44 30 30 31 36 32 36 31 20 53 50 43 3A 31 28 30 29 20 41 58 4C 3A 30 20 4F 42 44 3A 30 20 42 4C 3A 31 2E 36 20 42 54 3A 34
|-
| style="vertical-align: middle; text-align: center;" |Response Quantity 2
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |CRC-16
| style="vertical-align: middle; text-align: center;" |00 00 7A AE
|-
|} 


Note that Device Response converted from HEX to ASCII means: <br>
''Ver:03.18.14_04 GPS:AXN_5.10_3333 Hw:FMB120 Mod:15 IMEI:352093081452251 Init:2018-11-22 7:13 Uptime:17234 MAC:60BDD0016261 SPC:1(0) AXL:0 OBD:0 BL:1.6 BT:4'' <br> <br>
Device nACK response in hexadecimal stream: <br>
<code>00000000000000100E011100000008035209308145246801000032AC</code> <br> <br>
Parsed: 
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="2" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Device Answer
|-
! rowspan="1" style="width:50%; vertical-align: middle; text-align: center;" |Device Answer Part
! rowspan="1" style="width:50%; vertical-align: middle; text-align: center;" |HEX Code Part
|-
| style="vertical-align: middle; text-align: center;" |Zero Bytes
| style="vertical-align: middle; text-align: center;" |00 00 00 00
|-
| style="vertical-align: middle; text-align: center;" |Data Size
| style="vertical-align: middle; text-align: center;" |00 00 00 10
|-
| style="vertical-align: middle; text-align: center;" |Codec ID
| style="vertical-align: middle; text-align: center;" |0E
|-
| style="vertical-align: middle; text-align: center;" |Response Quantity 1
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |Response Type
| style="vertical-align: middle; text-align: center;" |11
|-
| style="vertical-align: middle; text-align: center;" |Response Size
| style="vertical-align: middle; text-align: center;" |00 00 00 08
|-
| style="vertical-align: middle; text-align: center;" |IMEI
| style="vertical-align: middle; text-align: center;" |03 52 09 30 81 45 24 68
|-
| style="vertical-align: middle; text-align: center;" |Response Quantity 2
| style="vertical-align: middle; text-align: center;" |01
|-
| style="vertical-align: middle; text-align: center;" |CRC-16
| style="vertical-align: middle; text-align: center;" |00 00 32 AC
|-
|} <br />

=='''<big>Differences between Codec 12, Codec 13 and Codec 14</big>'''==
In the table below you will see differences between Codec12, Codec13 and Codec14. 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Codec12
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Codec13
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Codec14
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |Communication
| style="vertical-align: middle; text-align: center;" |Server ⇄ Device Communication
| style="vertical-align: middle; text-align: center;" |One-way (Device → Server communication)
| style="vertical-align: middle; text-align: center;" |Server ⇄ Device Communication
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |Codec ID
| style="vertical-align: middle; text-align: center;" |0x0C
| style="vertical-align: middle; text-align: center;" |0x0D
| style="vertical-align: middle; text-align: center;" |0x0E
|-
! style="vertical-align: middle; text-align: center;" |command message type
| style="vertical-align: middle; text-align: center;" |0x05
| style="vertical-align: middle; text-align: center;" |-
| style="vertical-align: middle; text-align: center;" |0x05
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |Response Message Type
| style="vertical-align: middle; text-align: center;" |0x06
| style="vertical-align: middle; text-align: center;" | 0x06
| style="vertical-align: middle; text-align: center;" |0x06 (if it is ACK) or 0x11 (if it is nACK)
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |Command / Response size
| style="vertical-align: middle; text-align: center;" |Command/Response
| style="vertical-align: middle; text-align: center;" |Only Response
| style="vertical-align: middle; text-align: center;" |Command/Response + IMEI
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |Timestamp
| style="vertical-align: middle; text-align: center;" |Not Using
| style="vertical-align: middle; text-align: center;" |Is Using
| style="vertical-align: middle; text-align: center;" |Not Using
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |IMEI
| style="vertical-align: middle; text-align: center;" |Not Using
| style="vertical-align: middle; text-align: center;" |Not Using
| style="vertical-align: middle; text-align: center;" |Is Using
|-
|} <br />

='''<big>24 Position SMS Data Protocol</big>'''=

24-hour SMS is usually sent once every day and contains GPS data of last 24 hours. TP-DCS field of this SMS should indicate that message contains 8-bit data (i.e. TP-DCS can be <code>0x04</code>). <br>
Note, that 24 position data protocol is used only with subscribed SMS. Event SMS use standard AVL data protocol. <br> 

*'''<big>Encoding</big>'''

To be able to compress 24 GPS data entries into one SMS (140 octets), the data is encoded extensively using bit fields. Data packet can be interpreted as a bit stream, where all bits are numbered as follows: 
{| class="nd-othertables_2" style="width:100%;"
|+
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Byte 1
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Byte 2
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Byte 3
! rowspan="1" style="width:10%; border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |Byte 4 ...
|-
| style="vertical-align: middle; text-align: center;" |Bits 0 - 7
| style="vertical-align: middle; text-align: center;" |Bits 8 - 15
| style="vertical-align: middle; text-align: center;" |Bits 16 - 24
| style="vertical-align: middle; text-align: center;" |Bits 25 - ...
|-
|} 


Bits in a byte are numbered starting from least significant bit. A field of 25 bits would consist of bits 0 to 24 where 0 is the least significant bit and bit 24 – most significant bit. <br> 

*'''<big>Structure</big>'''

Below in the tables you will see SMS Data Structure: 
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="3" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |SMS Data Structure
|-
| style="width:10%; vertical-align: middle; text-align: center;" |8
| style="width:10%; vertical-align: middle; text-align: center;" |Codec ID
| style="width:10%; vertical-align: middle; text-align: center;" |Codec ID = 4 (0x04)
|-
| style="vertical-align: middle; text-align: center;" |35
| style="vertical-align: middle; text-align: center;" |Timestamp
| style="vertical-align: middle; text-align: center;" |Time corresponding to the first (oldest) GPS data element, represented in seconds elapsed from 2000.01.01 00:00 EET.
|-
| style="vertical-align: middle; text-align: center;" |5
| style="vertical-align: middle; text-align: center;" |ElementCount
| style="vertical-align: middle; text-align: center;" |Number of GPS data elements
|-
|} <br>
{| class="nd-othertables_2" style="width:100%;"
|+

! colspan="4" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |SMS Data Structure
|-
| rowspan="3" style="width:10%; vertical-align: middle; text-align: center;" |ElementCount *
| style="width:10%; vertical-align: middle; text-align: center;" |
| style="width:10%; vertical-align: middle; text-align: center;" |GPSDataElement
| style="width:10%; vertical-align: middle; text-align: center;" |GPS data elements
|-
| style="vertical-align: middle; text-align: center;" |
| style="vertical-align: middle; text-align: center;" |Byte - align padding
| style="vertical-align: middle; text-align: center;" |Padding bits to align to 8 - bits boundary represented in seconds elapsed from 2000.01.01 00:00 EET.
|-
| style="vertical-align: middle; text-align: center;" |64
| style="vertical-align: middle; text-align: center;" |IMEI
| style="vertical-align: middle; text-align: center;" |IMEI of sending device as 8 byte long integer
|-
|} 


The time of only the first GPS data element is specified in Timestamp field. Time corresponding to each further element can be computed as elementTime = Timestamp + (1 hour * elementNumber). <br> 
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="5" rowspan="1" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |GPS Data Element
|-
! rowspan="1" style="width:20%; vertical-align: middle; text-align: center;" |
! rowspan="1" style="width:20%; vertical-align: middle; text-align: center;" |
! rowspan="1" style="width:12%; vertical-align: middle; text-align: center;" |Size (bits)
! colspan="1" style="width:20%; vertical-align: middle; text-align: center;" |Field
! rowspan="1" style="width:28%; vertical-align: middle; text-align: center;" |Description
|-
| style="vertical-align: middle; text-align: center;" |
| style="vertical-align: middle; text-align: center;" |
| style="vertical-align: middle; text-align: center;" |1
| style="vertical-align: middle; text-align: center;" |ValidElement
| style="vertical-align: middle; text-align: center;" |ValidElement = 1 – there is a valid Gps Data Element following, 
ValidElement = 0 – no element at this position 
|-
| rowspan="5" style="vertical-align: middle; text-align: center;" |ValidElement == 1
| style="vertical-align: middle; text-align: center;" |
| style="vertical-align: middle; text-align: center;" |1
| style="vertical-align: middle; text-align: center;" |DifferentialCoords
| style="vertical-align: middle; text-align: center;" |Format of following data
|-
| rowspan="2" style="vertical-align: middle; text-align: center;" |DifferentialCoords == 1
| style="vertical-align: middle; text-align: center;" |14
| style="vertical-align: middle; text-align: center;" |LongitudeDiff
| style="vertical-align: middle; text-align: center;" |Difference from previous element‘s longitude.
LongitudeDiff = prevLongitude – Longitude + 213 – 1 
|-
| style="vertical-align: middle; text-align: center;" |14
| style="vertical-align: middle; text-align: center;" |LatitudeDiff
| style="vertical-align: middle; text-align: center;" |Difference from previous element‘s latitude
LatitudeDiff = prevLatitude – Latitude + 213 – 1
|-
| rowspan="2" style="vertical-align: middle; text-align: center;" |DifferentialCoords == 0
| style="vertical-align: middle; text-align: center;" |21
| style="vertical-align: middle; text-align: center;" |Longitude
| style="vertical-align: middle; text-align: center;" |Longitude = {(LongDegMult + 18 * 108) * (221 – 1)} over {36*108}
|-
| style="vertical-align: middle; text-align: center;" |20
| style="vertical-align: middle; text-align: center;" |Latitude
| style="vertical-align: middle; text-align: center;" |Latitude = (LatDegMult + 9*108) * (220 – 1) over {18*108}
|-
| style="vertical-align: middle; text-align: center;" |
| style="vertical-align: middle; text-align: center;" |
| style="vertical-align: middle; text-align: center;" |8
| style="vertical-align: middle; text-align: center;" |Speed
| style="vertical-align: middle; text-align: center;" |Speed in km/h
|-
|}


'''Longitude''' - longitude field value of GPSDataElement <br>
'''Latitude''' - latitude field value of GPSDataElement <br>
'''LongDegMult''' - longitude in degrees multiplied by 107 (integer part) <br>
'''LatDegMult''' - latitude in degrees multiplied by 107 (integer part) <br>
'''prevLongitude''' - longitude field value of previous GPSDataElemen <br>
'''prevLatitude''' - latitude field value of previous GPSDataElement <br> 

*'''<big>Decoding GPS position</big>'''

When decoding GPS data with DifferentialCoords = 1, Latitude and Longitude values can be computed as follows: Longitude = prevLongitude – LongitudeDiff + 213 – 1, Latitude = prevLatitude – LatitudeDiff + 213 – 1. <br>
If there were no previous non-differential positions, differential coordinates should be computed assuming prevLongitude = prevLatitude = 0. <br>
When Longitude and Latitude values are known, longitude and latitude representation in degrees can be computed as follows: 

[[File:24SMS.png]]

*'''<big>SMS Events</big>'''

When Configured to generate SMS event user will get this SMS upon event: <br>
''<Year/Month/Day> <Hour:Minute:Second> P:<profile_nr> <SMS Text> Val:<Event Value> Lon:<longitude> Lat:<latitude> Q:<HDOP>'' <br> <br>
Example: <br>
''2016./04/11 12:00:00 P:3 Digital Input 1 Val:1 Lon:51.12258 Lat: 25.7461 Q:0.6'' <br> 

='''<big>Sending data using SMS</big>'''=
This type data sending is using for FMBXXX devices which can be configured in [[FMB120 SMS/Call settings#SMS Data Sending|SMS Data Sending settings]].<br> 

*'''<big>Data sending via SMS</big>'''

AVL data or events can be sent encapsulated in binary SMS. TP-DCS field of these SMS should indicate that message contains 8-bit data (for example: TP-DCS can be <code>0x04</code>). 
{| class="nd-othertables_2" style="width:100%;"
|+
! colspan="2" style="border-bottom: 2px solid #0054A6; vertical-align: middle; text-align: center;" |SMS data (TP-UD)
|-
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |AVL data array
! rowspan="1" style="width:10%; vertical-align: middle; text-align: center;" |IMEI
|-
| style="vertical-align: middle; text-align: center;" |X bytes
| style="vertical-align: middle; text-align: center;" |8 bytes
|-
|}


'''AVL data array''' – array of encoded AVL data. <br>
'''IMEI''' – IMEI of sending module encoded as a big endian 8 byte long number.

='''<big>CRC-16</big>'''=
CRC (Cyclic Redundancy Check) is an error-detecting code using for detect accidental changes to RAW data. The algorithm how to calculate CRC-16 (also known as CRC-16/IBM) you will find below. <br>
[[File:CRC16.png]]