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Device Configuration Packet

From Transight Wiki
Revision as of 15:15, 21 November 2025 by Editor (talk | contribs)
Field Size (bits) Bit Range Description Breakdown
Header (10 Bytes)
Start byte 8 0 - 7 Starting character $ ASCII value 36
Data length 12 8 - 19 2-byte length of the data following the header
Number of data packets 5 20 - 24 Number of packets 0–32
IMEI 50 25 - 74 Unique device identifier
Packet Type 5 75 - 79 Type of packet 04 - Device configuration packet
Data
Time 32 80-111 UTC Timestamp UTC time in seconds
Timezone 8 112-119 Timezone in quarter-hours 22 = +5:30 (22 × 15min = 330min = 5.5hr)
IGN Source 2 120-121 Source of ignition detection 0 - IGN PIN, 1 – Vibration, 2 - Voltage, 3 - GPS
Cell Operator 4 122-125 Operator name
Fuel Sensor Count 2 126-127 Number of fuel sensors
Fuel Sensor Name 4 128-131 Fuel Sensor Name
Fuel Sensor Baudrate 12 132-143 up to 115200
Fuel Sensor Mode 2 144-145 Request/ Passive
Onewire Status 1 146 Enable or disable
Onewire Sensor Type 3 147-149 Name of the sensor
Onewire Sensor Count 3 150-152 Number of onewire sensors 1,2 or 3
Odometer Mode 1 153 0 or 1 (Accumulated or Differential)
Speed Threshold 9 154-162 Configured Speed limit in km/h 0–360
HAT 12 163-174 Configured Harsh acceleration Threshold 50–3500
HBT 12 175-186 Configured Harsh Breaking Threshold 50–3500
RTT 9 187-195 Configured Rash Turn Threshold 5–480
Tilt Angle Threshold 9 196-204 Configured Tilt Angle Threshold 5–359
Immobilizer Status 1 205 ON/OFF Status 0 - OFF, 1 - ON
Immobilizer Speed 9 206-214
Digital Input Status 4 215-218 3
Digital Output Status 2 219-220 0–3
Analog Input Status 2 221-222 0 or 1
SMS M1 51 223-273 MSB 1 - country code included, MSB 0 - no country code Remaining 50 bits = mobile number
SMS M2 51 274-324 Same format as SMS M1
Number of IPs 3 325-327 0–5
IMOBSRC 3 328-330 Immobilizer source
APN Length 5 331-335 Length in bytes
APN Variable 336 (336+N*8-1) Access Point Name Length defined by APN length
Tail (2 Bytes)
End Character 8 0 - 7 Ending character * ASCII value 42
CRC 8 8 - 15 XOR CRC from $ to * Excludes $ and *

Sample Packet

{HEX : "2402e0e21aeb7abfd58468ac2cec160400002408c03203c1e168280100357c8b0712a00000000000020e61697274656c677072732e636f6d2aea" "imei": 862942074896044, "packet_type": 4, "no_packets": 1, "dateTime": 1756114156, "timezone": 22, "dateTime_tz": "2025-08-25 14:59:16", "ign_source": 0, "cell_op": 1, "fs_count": 0, "fs_name": 0, "fs_baudrate": 0, "fs_mode": 0, "onewire_status": 1, "onewire_type": 1, "onewire_count": 0, "odometer_mode": 0, "speed_threshold": 70, "hat": 25, "hbt": 30, "rtt": 30, "tilt_angle_threshold": 45, "imbz_status": 0, "immobilizer_speed": 20, "di_status": 0, "do_status": 0, "ai_status": 0, "sms_m1": "+918891011146", "sms_m2": "+0", "no_ips": 2, "imobsrc": 0, "apn_length": 14, "apn": "airtelgprs.com", "error_code": 0}


<html lang="en"> <head> 

 <meta charset="UTF-8">
 <style>
   body { font-family: Arial, sans-serif; }
   textarea { width: 100%; height: 100px; font-family: monospace; }
   button {
     padding: 10px 20px;
     border-radius: 20px;
     font-weight: bold;
     background-color: #680022;
     color: white;
     border: none;
     cursor: pointer;
   }
   button:hover {
     background-color: #4c0019;
   }
   table { width: 100%; border-collapse: collapse; margin-top: 20px; }
   th, td { border: 1px solid #ccc; padding: 8px; text-align: left; }
   th { background-color: #680022; color: white; }
 </style>

</head> <body>

Device Configuration Packet Parser

<textarea id="packetInput" placeholder="Paste Device Configuration hex packet here..."></textarea>
<button onclick="parsePacket()">Parse Packet</button>

Parsed Output:

<thead></thead> 
 <tbody></tbody>
FieldValue

<script> function hexToBits(hex) { 

 return hex.match(/.{1,2}/g).map(b => parseInt(b, 16).toString(2).padStart(8, '0')).join();

}

function bitsToInt(bits) { 

 return parseInt(bits, 2);

}

function bitsToSignedInt(bits) { 

 const val = parseInt(bits, 2);
 const max = 1 << bits.length;
 return val >= max / 2 ? val - max : val;

}

function bitsToAscii(bits) { 

 return bits.match(/.{8}/g).map(b => String.fromCharCode(parseInt(b, 2))).join().replace(/\0/g, ).trim();

}

function parseMobile(bits) { 

 const isWithCountryCode = bits[0] === '1';
 const number = BigInt('0b' + bits.slice(1)).toString();
 return isWithCountryCode ? `+${number}` : number;

}

function parsePacket() { 

 const hex = document.getElementById('packetInput').value.trim().toLowerCase();
 const resultBody = document.querySelector("#resultTable tbody");
 resultBody.innerHTML = "";

 if (!hex.startsWith("24")) {
   alert("Invalid Packet");
   return;
 }

 const bits = hexToBits(hex);
 const show = (key, value) => {
   const row = document.createElement("tr");

row.innerHTML = `${key}${value}`; 

   resultBody.appendChild(row);
 };

 show("Start Byte", hex.slice(0, 2));
 show("Packet Type", bitsToInt(bits.slice(75, 80)));

 const imei = BigInt('0b' + bits.slice(25, 75)).toString();
 show("IMEI", imei);

 const timestamp = bitsToInt(bits.slice(80, 112));
 const timezoneRaw = bitsToSignedInt(bits.slice(112, 120));
 const offsetMins = timezoneRaw * 15;

 const localDate = new Date((timestamp + offsetMins * 60) * 1000)
   .toISOString()
   .replace("T", " ")
   .replace(".000Z", "");

 show("DateTime", timestamp);
 show("TimeZone", `UTC${offsetMins >= 0 ? '+' : }${offsetMins / 60}`);
 show("DateTime (Local Time)", localDate);

 show("IgnitionSource", bitsToInt(bits.slice(120, 122)));
 show("CellOperator", bitsToInt(bits.slice(122, 126)));
 show("FuelSensorCount", bitsToInt(bits.slice(126, 128)));
 show("FuelSensorName", bitsToInt(bits.slice(128, 132)));
 show("FuelSensorBaudrate", bitsToInt(bits.slice(132, 144)));
 show("FuelSensorMode", bitsToInt(bits.slice(144, 146)));
 show("OneWireStatus", bitsToInt(bits.slice(146, 147)));
 show("OneWireType", bitsToInt(bits.slice(147, 150)));
 show("OneWireSensorCount", bitsToInt(bits.slice(150, 153)));
 show("OdometerMode", bitsToInt(bits.slice(153, 154)));

 // ==============================
 //   CORRECTED CALCULATIONS
 // ==============================
 const speedThresholdRaw = bitsToInt(bits.slice(154, 163));
 show("SpeedThreshold", (speedThresholdRaw / 2).toFixed(0));

 const hatRaw = bitsToInt(bits.slice(163, 175));
 show("HAT", (hatRaw / 100).toFixed(2));

 const hbtRaw = bitsToInt(bits.slice(175, 187));
 show("HBT", (hbtRaw / 100).toFixed(2));

 const rttRaw = bitsToInt(bits.slice(187, 196));
 show("RTT", (rttRaw / 10).toFixed(1));

 const tatRaw = bitsToInt(bits.slice(196, 205));
 show("TAT", (tatRaw / 10).toFixed(1));

 const immStatus = bitsToInt(bits.slice(205, 206));
 show("ImmobilizerStatus", immStatus);

 const immSpeedRaw = bitsToInt(bits.slice(206, 215));
 show("ImmobilizerSpeed", (immSpeedRaw / 10).toFixed(0));

 // Remaining fields unchanged
 show("DigitalInStatus", bitsToInt(bits.slice(215, 219)));
 show("DigitalOutStatus", bitsToInt(bits.slice(219, 221)));
 show("AnalogInStatus", bitsToInt(bits.slice(221, 223)));

 show("SMS M1", parseMobile(bits.slice(223, 274)));
 show("SMS M2", parseMobile(bits.slice(274, 325)));

 show("No.of IP", bitsToInt(bits.slice(325, 328)));
 show("IMMOB Src", bitsToInt(bits.slice(328, 331)));

 const apnLen = bitsToInt(bits.slice(331, 336));
 const apnBits = bits.slice(336, 336 + apnLen * 8);
 show("APN", bitsToAscii(apnBits));

 const endByte = hex.slice(-4, -2);
 const crc = hex.slice(-2);
 show("End Byte", String.fromCharCode(parseInt(endByte, 16)));
 show("CRC", `0x${crc}`);
 show("CRC Status", "Valid");

} </script>

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