Difference between revisions of "Codec JSON"
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− | === | + | ===Codec JSON Description=== |
JSON (JavaScript Object Notation) is a light data exchange format, that due to its simplicity to be written and fast interpretation and generation for machines. | JSON (JavaScript Object Notation) is a light data exchange format, that due to its simplicity to be written and fast interpretation and generation for machines. | ||
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'''Note.''' communication to the AWS IoT Service uses a TLS certificate to authenticate, please follow this link where is explained how to obtain it: | '''Note.''' communication to the AWS IoT Service uses a TLS certificate to authenticate, please follow this link where is explained how to obtain it: | ||
− | [https://wiki.teltonika-gps.com/view/Getting_Started_with_AWS_IoT_Core#Provision_the_Device_with_credentials | + | [[https://wiki.teltonika-gps.com/view/Getting_Started_with_AWS_IoT_Core#Provision_the_Device_with_credentials]] |
==='''Codec JSON Structure'''=== | ==='''Codec JSON Structure'''=== | ||
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"240": 0 | "240": 0 | ||
} } | } } | ||
− | ==='''Sending commands from AWS to | + | ==='''Sending commands from AWS to device'''=== |
− | Any SMS command, which is interpretable by the device‘s firmware, can be used to control the device that was | + | Any SMS command, which is interpretable by the device‘s firmware, can be used to control the device that was setup in AWS. |
SMS/GPRS commands:<br> | SMS/GPRS commands:<br> | ||
− | + | https://wiki.teltonika-gps.com/view/FMB_SMS/GPRS_Commands <br> | |
The structure for the JSON:<br> | The structure for the JSON:<br> | ||
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'''{ "CMD": "<SMS_Command> <Input>" }'''<br> | '''{ "CMD": "<SMS_Command> <Input>" }'''<br> | ||
− | An example | + | An example for using the setdigout command:<br> |
'''{ "CMD": "setdigout 111" }''' | '''{ "CMD": "setdigout 111" }''' |
Revision as of 12:54, 10 February 2023
Codec JSON Description
JSON (JavaScript Object Notation) is a light data exchange format, that due to its simplicity to be written and fast interpretation and generation for machines.
JSON is made up of two structures:
- A collection of name/value pairs. In various languages, this is known as an object, record, structure, dictionary, hash table, key list, or associative array.
- An ordered list of values. In most languages, this is implemented as arrays, vectors, lists, or sequences.
As this Codec is based on a subset of the JavaScript Programming Language, Standard ECMA-262 3rd Edition - December 1999. JSON is a text format that is completely language-independent but uses conventions that are widely known to programmers of the C family of languages, including C, C++, C#, Java, JavaScript, Perl, Python, and many others. These properties make JSON an ideal language for data exchange.
JSON is an open standard file format and data exchange format used between FMBXXX devices and AWS IoT Shadow Service:
Its basic principles are:
- AVL data will be uploaded to Amazon Web Services IOT Shadow service.
- AVL data is JSON key-value based
Data sending procedure and logic are the same as sending to regular servers, except data is being packed to JSON document as required in Amazon Shadow service.
This codec is required to use in the Amazon AWS console, it is important to note that AWS uses TLS encryption protocol, and it must be set up the FMBXXX device properly into the AWS IoT service.
Since the firmware version 03.28.00. Rev.00 AWS JSON codec is supported.
AWS Shadow
AWS shadow allows to retain device state, this service reports only the latest Shadow state data. Using this mode does not allow sending commands to device or receiving responses.
When using this mode JSON format must be enabled, otherwise, data sending will not begin.
Using this service device uses x509 certificates to authenticate. No other method is possible. https://docs.aws.amazon.com/iot/latest/developerguide/x509-client-certs.html
Doc: https://docs.aws.amazon.com/iot/latest/developerguide/iot-device-shadows.html
AWS Custom
This mode allows configuring custom topic names, where data will be published and commands received. When using this mode all Codec protocols are supported (Codec8, Codec8E (E-Extended), Codec JSON).
Full Codec description can be found here.
Authentication is the same as AWS Shadow.
Codec JSON is available as a transmission Codec, this parameter can be selected in:
Teltonika Configurator >> System >> System Settings >> Data Protocol >> and selecting Codec JSON
Additionally, to develop the full configuration in the Teltonika device, make sure to use the MQTT protocol.
This can be done in Teltonika configurator >> GPRS Server Settings >> and in protocol selecting MQTT.
Note. communication to the AWS IoT Service uses a TLS certificate to authenticate, please follow this link where is explained how to obtain it:
[[1]]
Codec JSON Structure
JSON format: { "reported": { - object as per AWS shadow documentation "tcxn": { "connection_status": 2 }, - Current state of device "ts": 1510641143000, - timestamp then record was generated "pr": 0, - record priority "lnglat": "0.000000,0.000000", - longitude latitude "alt": 0, - altitude "ang": 0, - angle "sat": 0, - num of visible satellites "sp": 0, - speed "evt": 0, - IO which generated event "21": 3, - „AVL_ID“:value "24": 0, "66": 13909, "67": 0, "68": 0, "69": 2, "80": 0, "181": 0, "182": 0, "200": 0, "239": 1, "240": 0 } }
Sending commands from AWS to device
Any SMS command, which is interpretable by the device‘s firmware, can be used to control the device that was setup in AWS.
SMS/GPRS commands:
https://wiki.teltonika-gps.com/view/FMB_SMS/GPRS_Commands
The structure for the JSON:
{ "CMD": "<SMS_Command> <Input>" }
An example for using the setdigout command:
{ "CMD": "setdigout 111" }