Iridium Edge Communication Protocol
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Communication Protocol
| SBD Packet structure | ||||||
|---|---|---|---|---|---|---|
| Timestamp | Longitude | Latitude | SBD AVL ID and flags | DIN/DOUT info | Reserved | Speed |
| 4 bytes | 3 bytes | 3 bytes | 1 bytes | 1 bytes | 1 bytes | 1 bytes |
Definitions
- Timestamp – Indicates when record was generated
- Longitude - encoded in 3 bytes data. Server which gets this data should divide result from 46603,375 and subtract 180 in order to get actual longitude value. This coefficient is got in following way: 16777215(maximum 3 bytes value) divided from 360 (maximum longitude value then 180 is added). This calculation is used to fit negative and positive values to 3 bytes width variable.
- Latitude - Latitude is calculated in same way as longitude but since latitude maximum value is two times smaller than longitude it can produce a bit more accurate data. Coefficient for latitude is 93206,75. This coefficient is got in following way: 16777215(maximum 3 bytes value) divided from 180 (maximum latitude value then 90 is added). This calculation is used to fit negative and positive values to 3 bytes width variable.
- SBD AVL ID and flags – Custom id that will indicate what caused the record to be generated (as only periodic records are generated, id is not used)
- Din/Dout info - Displays configured IO elements in parameter id 99422
- Reserved - Not used anywhere, but left due to compatibility with fm6 project.
- Speed – Indicates the speed of the vehicle if configured. If not (or in case of no gps) – will display 255