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| <html lang="en">
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| <head>
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| <meta charset="UTF-8">
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| <title>OTA Packet Parser</title>
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| <style>
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| body { font-family: Arial, sans-serif; padding: 20px; }
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| textarea { width: 100%; height: 100px; font-family: monospace; margin-bottom: 10px; }
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| button {
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| padding: 10px 20px; border-radius: 20px;
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| font-weight: bold; background-color: #680022; color: white;
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| border: none; cursor: pointer;
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| }
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| button:hover { background-color: #4c0019; }
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| table { width: 100%; border-collapse: collapse; margin-top: 20px; }
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| th, td { border: 1px solid #ccc; padding: 8px; }
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| th { background-color: #680022; color: white; }
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| </style>
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| </head>
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| <body>
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|
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| <h2>OTA Packet Parser</h2>
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| <textarea id="hexInput" placeholder="Paste OTA packet hex here..."></textarea><br>
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| <button onclick="parseOTAPacket()">Parse OTA Packet</button>
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|
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| <h3>Parsed Output:</h3>
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| <table id="resultTable">
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| <thead><tr><th>Field</th><th>Value</th></tr></thead>
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| <tbody></tbody>
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| </table>
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|
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| <script>
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| function hexToBits(hex) {
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| return hex.match(/.{1,2}/g).map(b =>
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| parseInt(b, 16).toString(2).padStart(8, '0')).join('');
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| }
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|
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| function bitsToInt(bits) {
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| return parseInt(bits, 2);
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| }
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|
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| function bitsToSignedInt(bits) {
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| let value = parseInt(bits, 2);
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| const max = Math.pow(2, bits.length);
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| return value >= max / 2 ? value - max : value;
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| }
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|
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| function bitsToAscii(bits) {
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| let ascii = '';
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| for (let i = 0; i < bits.length; i += 8) {
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| ascii += String.fromCharCode(parseInt(bits.slice(i, i + 8), 2));
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| }
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| return ascii;
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| }
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|
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| function parseIMEIFromHex(hex) {
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| const imeiHex = hex.slice(6, 22); // 8 bytes = 16 hex characters = bits 24–74
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| let imei = '';
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| for (let i = 0; i < imeiHex.length; i += 2) {
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| const byte = parseInt(imeiHex.slice(i, i + 2), 16);
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| imei += ((byte >> 4) & 0x0F).toString() + (byte & 0x0F).toString();
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| }
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| return imei.replace(/^0+/, '');
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| }
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|
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| function parseOTAPacket() {
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| const hex = document.getElementById("hexInput").value.trim().toLowerCase();
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| const resultBody = document.querySelector("#resultTable tbody");
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| resultBody.innerHTML = "";
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|
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| if (!hex.startsWith("24")) {
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| alert("Packet must start with hex '24'");
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| return;
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| }
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|
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| const bits = hexToBits(hex);
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| const getBits = (start, end) => bits.slice(start, end);
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| const output = (label, value) => {
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| const row = document.createElement("tr");
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| row.innerHTML = `<td>${label}</td><td>${value}</td>`;
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| resultBody.appendChild(row);
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| };
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|
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| // Fields
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| output("IMEI", parseIMEIFromHex(hex));
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| output("Packet Type", bitsToInt(getBits(75, 80)));
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| output("OTA Source", bitsToInt(getBits(80, 85)));
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| output("Error Status", bitsToInt(getBits(85, 93)));
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|
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| const cellBits = getBits(93, 144);
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| const isWithCountryCode = cellBits[0] === '1';
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| const cellNo = parseInt(cellBits.slice(1), 2);
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| output("Cell Number", isWithCountryCode ? `+${cellNo}` : cellNo);
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|
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| const dt = bitsToInt(getBits(144, 176));
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| output("UTC Timestamp", new Date(dt * 1000).toISOString());
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|
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| const timezoneRaw = bitsToSignedInt(getBits(176, 184));
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| const offsetMinutes = timezoneRaw * 15;
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| const h = Math.floor(Math.abs(offsetMinutes) / 60);
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| const m = Math.abs(offsetMinutes % 60);
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| const tzSign = offsetMinutes >= 0 ? "+" : "-";
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| output("Timezone", `${offsetMinutes} mins = UTC${tzSign}${h}:${m.toString().padStart(2, '0')}`);
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|
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| const localTime = new Date((dt + offsetMinutes * 60) * 1000)
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| .toISOString().replace("T", " ").replace(".000Z", "");
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| output("DateTime (Local)", localTime);
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|
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| const cmdLength = bitsToInt(getBits(184, 192));
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| output("Command Length", cmdLength);
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|
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| const cmdBits = getBits(192, 192 + cmdLength * 8);
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| output("Command", bitsToAscii(cmdBits));
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|
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| const respLenStart = 192 + cmdLength * 8;
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| const responseLength = bitsToInt(getBits(respLenStart, respLenStart + 8));
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| output("Response Length", responseLength);
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|
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| const respBits = getBits(respLenStart + 8, respLenStart + 8 + responseLength * 8);
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| output("Response", bitsToAscii(respBits));
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| }
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| </script>
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| </body>
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| </html>
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