Telemetry Packet

Field	Size (bits)	Bit Range	Description	Breakdown
Header (10 bytes)
Start byte	8	0–7	Starting character $ (ASCII value 36)	$
Data length	12	08–19	2-byte length of the data following the header
Num of data packets	5	20–24	Number of packets (0–32)	0–32
IMEI	50	25–74	Unique device identifier	e.g., 887744556677882
packet type	5	75–79	Integer type: 00 - Device Info Packet 01 - Alert Packet 02 - OTA Packet 03 - Error Packet 04 - Device Configuration Packet 05 - IP Configuration Packet 06 - Live ||
Data (= 55 bytes × number of packets)
Packet Status	1	—	Type of packet
Frame Number	16	—	Frame number
AlertID	8	—	Alert identifier
Operator	4	—	Network operator	00-Airtel, 01-BSNL, 02-VI, 04-JIO
Signal Strength	5	—	Signal strength	Integer (0–31)
MCC	10	—	Mobile country code	Integer
MNC	6	—	Mobile network code	Integer
Cell Id	16	—	Cell tower ID	Integer
Location Area Code	16	—	Location area code	Integer
Fix_status	1	—	GPS fix status	0: No fix, 1: Valid Fix
Start byte	1	—	Latitude coordinate	Divide by 1,000,000 for float value
NS_Indication	1	—	N or S	0: N, 1: S
Longitude	29	—	Longitude coordinate	Divide by 1,000,000 for float value
EW_Indication	1	—	East/West Indication	0: E, 1: W
HDOP	10	—	Horizontal dilution	Divide by 10 for float value
PDOP	10	—	Position dilution	Divide by 10 for float value
Speed	10	—	Speed in km/h	Divide by 10 for float value
Altitude	15	—	Altitude in meters	Divide by 10 for float value
Power Status	1	—	Power connection status	0: Power disconnected, 1: Power connected
Ignition Status	1	—	Ignition status	0: OFF, 1: ON
Immobilizer Status	1	—	Immobilizer status	0: OFF, 1: ON
Tamper	1	—	Wire Tamper detection	0: Tamper clear, 1: Tamper alert ON
Supply Voltage	6	—	External battery voltage	Divide by 10 for float value
Internal Battery Voltage	6	—	Internal battery voltage	Divide by 10 for float value
Fuel SensorValue 1	16	—	Fuel sensor value	Divide by 10 if float
Fuel Percentage 1	16	—	Fuel level percentage	Divide by 10 for float value
Fuel SensorValue 2	16	—	Fuel sensor value	Divide by 10 if float
Fuel Percentage 2	16	—	Fuel level percentage	Divide by 10 for float value
Fuel SensorValue 3	16	—	Fuel sensor value	Divide by 10 if float
Fuel Percentage 3	16	—	Fuel level percentage	Divide by 10 for float value
Analog Input	10	—	Analog input	Divide by 10 for float value
Analog Input 1	10	—	Analog input 1	Divide by 10 for float value
Digital Input 1	1	—	Digital input 1	0 or 1
Digital Input 2	1	—	Digital input 2	0 or 1
Digital Output 1	1	—	Digital output 1	0 or 1
Digital Output 2	1	—	Digital output 2	0 or 1
Temperature sensor status 1	1	—	Status of temperature sensor 1	1 if connected, 0 if not connected
Temperature 1	12	—	Temperature in °C	Signed, divide by 10
Temperature sensor status 2	1	—	Status of temperature sensor 2	1 if connected, 0 if not connected
Temperature 2	12	—	Temperature in °C	Signed, divide by 10
Temperature sensor status 3	1	—	Status of temperature sensor 3	1 if connected, 0 if not connected
Temperature 3	12	—	Temperature in °C	Signed, divide by 10
Humidity	8	—	Humidity percentage
Odometer	35	—	Odometer value in meters
DateTime UTC	32	—	Timestamp	UTC time in seconds
TimeZone	8	—	Timezone in quarter-hours (e.g., 22 = +5:30). Each unit = 15 mins. Value 22 = 22 × 15 mins = 330 mins = +5:30 Range: -48 to 56, 2's complement ||
Tail
End Character	8	0–7	Starting character * (ASCII value 42)	*
CRC	8	8–15	8-bit XOR CRC of data starting from $ to * (excluding $ and *)