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1. Header/Payload Type – 1 byte
2. Message-ID - 1 byte (3 reserved bits + 5 bits to be used for the ID)
3. Application ID: 4 bytes
4. Device ID: 4 bytes
5. Battery: 1 byte
6. Time: 4 bytes
7. Status: 1 byte – 8 bits:
Bit 0 – shows if Extended Prediction Orbit (EPO) worked. This allows the device to predict where satellites will
be in the sky.
Bit 1 – shows if the device is charging.
Bit 2 and 3 show if there is GPS fix:
00: open the GPS fix
01: Locating
10: Successful
11: Failed
Location Payload
The device will send Location payload when the GPS has a fix.
1. Header/Payload Type – 1 byte
2. Message-ID - 1 byte (3 reserved bits + 5 bits to be used for the ID)
3. Application ID: 4 bytes
4. Device ID: 4 bytes
5. Longitude: 4 bytes
6. Latitude: 4 bytes
7. Accuracy: 1 byte
8. GPS Start Number: 1 byte
9. Battery: 1 byte
10. Time: 4 bytes
11. Status: 1 byte
Bit 0 – shows if Extended Prediction Orbit (EPO) worked. This allows the device to predict where satellites will
be in the sky.
Bit 1 – shows if the device is charging
Bit 2 and 3 show if there is a GPS fix
00: open the GPS fix
01: Locating
10: Successful
1 byte
2 byte
3-6 byte
7-10
byte
11 byte
12-16
byte
16
byte
Header/ Payload
Type
Message
ID
Application
ID
Device
ID
Battery
Level
Time
Status
1 byte
2 byte
3-6 byte
7-10
byte
11-14
byte
15-18
byte
19 byte
20
byte
2
b
Header/
Payload
Type
Message
ID
Application
ID
Device
ID
Longitude
Accuracy
GPS
Start
Number
Battery
T