Device Info Packet: Difference between revisions

Revision as of 11:17, 21 July 2025

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
Number of data packets	5	20–24	Number of packets (0–32)	0–32
IMEI	50	25–74	Unique device identifier
Packet type	5	75–79	Type of packet	00 - Device Info
Data
Time	32		UTC Timestamp	UTC time in seconds
Time Zone	8		Timezone in quarter-hours (e.g., 22 = +5:30), quarter-hour increment means each unit represents 15 minutes. The value 22 represents 22 quarter hours. Ranges from -48 to 56, negative timezone to 2's complement representation	eg: 22 (+5:30) → 22×15=330 minutes → 330÷60=5.5 hours → 5 hours and 30 minutes
ICCID	160		20 Bytes, Character string	8991000903297069053F
VID	32		4 Bytes, Character string	TRAN
CELLULAR_MODULE_FV NAME	40		5 Bytes, Character string	TSPJT
CELLULAR_MODULE_FV VERSION	80		10 Bytes, Character string	XX.YY.ZZZZ
CELLULAR_MODULE_FV BUILD NO	40		5 Bytes, Character string	YYDDD
MCU_APP_MODULE_FV NAME	40		5 Bytes, Character string	TSPJT
MCU_APP_MODULE_FV VERSION	80		10 Bytes, Character string	XX.YY.ZZZZ
MCU_APP_MODULE_FV BUILD NO	40		5 Bytes, Character string	YYDDD
MCU_BTL_MODULE_FV NAME	40		5 Bytes, Character string	TSPJT
MCU_BTL_MODULE_FV VERSION	80		10 Bytes, Character string	XX.YY.ZZZZ
MCU_BTL_MODULE_FV BUILD NO	40		5 Bytes, Character string	YYDDD
VN	80		10 Bytes, Character string	KL07CP8490
HWINFO	88		11 Bytes, Character string	PCB-0220-AB
Tail(2 Bytes)
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 *)

Sample Packet

HEX : "2406e0e21aeb7abfd58068778b681638393931393530393132393633373932393833355452414e545344344720332e20302e202020342020202030545344345220332e20302e202020332020202030545344524220332e20302e202020312020202030585858585858585858585043422d303236312d41412ab9"
{"imei": 862942074896044, 
"packet_type": 0, "no_packets": 1, "dateTime": 1752664936, "timezone": 22, "dateTime_tz": "2025-07-16 16:52:16", "iccid": "89919509129637929835", "vid": "TRAN", "cmfv_name": "TSD4G", "cmfv_version": " 3. 0. 4", "cmfv_build": " 0", "mcua_name": "TSD4R", "mcua_version": " 3. 0. 3", "mcua_build": " 0", "mcub_name": "TSDRB", "mcub_version": " 3. 0. 1", "mcub_build": " 0", "vn": "XXXXXXXXXX", "hwinfo_build": "PCB-0261-AA", "error_code": 0, "raw_data": }

Device Info Packet Parser

Parsed Output:

Field	Value

Device Info Packet Parser

Parsed Output:

Field	Value

@@ Line 303: / Line 303: @@
 }
 </script>
+</body>
+</html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <title>Device Info Packet Parser</title>
+  <style>
+    body { font-family: Arial, sans-serif; }
+    textarea { width: 100%; height: 100px; font-family: monospace; }
+    button {
+      padding: 10px 20px;
+      border-radius: 20px;
+      margin-top: 10px;
+      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>
+<h2>Device Info Packet Parser</h2>
+<textarea id="packetInput" placeholder="Paste packet here..."></textarea><br>
+<button onclick="parsePacket()">Parse Packet</button>
+<h3>Parsed Output:</h3>
+<table id="resultTable">
+  <thead><tr><th>Field</th><th>Value</th></tr></thead>
+  <tbody></tbody>
+</table>
+<script>
+function hexToBits(hex) {
+  return hex.match(/.{1,2}/g).map(byte =>
+    parseInt(byte, 16).toString(2).padStart(8, '0')).join('');
+}
+function bitsToInt(bits) {
+  return parseInt(bits, 2);
+}
+function bitsToSignedInt(bits) {
+  const value = parseInt(bits, 2);
+  const max = Math.pow(2, bits.length);
+  return value >= max / 2 ? value - max : value;
+}
+function bitsToAscii(bits) {
+  return bits.match(/.{8}/g).map(b => String.fromCharCode(parseInt(b, 2))).join('').trim();
+}
+function bigIntFromBits(bits) {
+  return BigInt('0b' + bits).toString();
+}
+function parsePacket() {
+  const hex = document.getElementById('packetInput').value.trim().toLowerCase();
+  const resultBody = document.querySelector("#resultTable tbody");
+  resultBody.innerHTML = "";
+  if (!hex || !hex.startsWith("24")) {
+    alert("Invalid packet");
+    return;
+  }
+  const bits = hexToBits(hex);
+  const output = (label, value) => {
+    const row = document.createElement("tr");
+    row.innerHTML = `<td>${label}</td><td>${value}</td>`;
+    resultBody.appendChild(row);
+  };
+  // Corrected IMEI extraction using bit-level parsing
+  const imei = bigIntFromBits(bits.slice(25, 75));
+  output("IMEI", imei);
+  const packetType = bitsToInt(bits.slice(75, 80));
+  output("Packet Type", packetType);
+  const tsBits = bits.slice(80, 112);
+  const timezoneBits = bits.slice(112, 120);
+  const ts = bitsToInt(tsBits);
+  const timezoneRaw = bitsToSignedInt(timezoneBits);
+  const offsetMin = timezoneRaw * 15;
+  const sign = offsetMin >= 0 ? "+" : "-";
+  const h = Math.floor(Math.abs(offsetMin) / 60);
+  const m = Math.abs(offsetMin % 60);
+  const localDate = new Date((ts + offsetMin * 60) * 1000);
+  const localStr = localDate.toISOString().replace("T", " ").replace(".000Z", "");
+  output("DateTime (Epoch)", ts);
+  output("TimeZone", `${offsetMin} mins = UTC${sign}${h}:${m.toString().padStart(2, '0')}`);
+  output("DateTime (Local Time)", localStr);
+  const asciiFields = [
+    ["ICCID", 120, 279],
+    ["VID", 280, 311],
+    ["CMFV Name", 312, 351],
+    ["CMFV Version", 352, 431],
+    ["CMFV Build", 432, 471],
+    ["MCUA Name", 472, 511],
+    ["MCUA Version", 512, 591],
+    ["MCUA Build", 592, 631],
+    ["MCUB Name", 632, 671],
+    ["MCUB Version", 672, 751],
+    ["MCUB Build", 752, 791],
+    ["VN", 792, 871],
+    ["HWINFO", 872, 959]
+  ];
+  for (const [label, start, end] of asciiFields) {
+    const value = bitsToAscii(bits.slice(start, end + 1));
+    output(label, value);
+  }
+  output("Error Code", 0); // Optional placeholder
+}
+</script>
 </body>
 </html>