mirror of
https://github.com/mikecarper/MeshCore.git
synced 2026-09-02 06:54:18 +00:00
661 lines
20 KiB
JavaScript
661 lines
20 KiB
JavaScript
(function (global) {
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"use strict";
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const TYPE_TEMPERATURE = 0x11;
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const TYPE_VOLTAGE = 0x12;
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const TYPE_GPS = 0x13;
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const METERS_PER_DEGREE = 111320;
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const DEGREES_TO_RADIANS = Math.PI / 180;
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const EXAMPLES = Object.freeze({
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temperature: Object.freeze({
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label: "Temperature example",
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command: "get telemetry.temp",
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reply:
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"> EUDUcWoeMAVZVVVVUVVVVVXVVQACTJlSwEyZMmTJkuXKkyZEeNFARIcOFChQoUOHDiRY0aPI/ypUuXMmTA==",
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}),
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voltage: Object.freeze({
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label: "Voltage example",
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command: "get telemetry.volt",
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reply:
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"> EkDUcWoeMAAB5+bl5eTj4uLh4ODf3t7d3Nvb2tnZ2NfX1tXU1NPS0tHQ0M/Ozc3My8vKycnI/w==",
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}),
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gps: Object.freeze({
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label: "GPS example",
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command: "get telemetry.gps",
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reply:
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"> EwB9cmoeGIChAxwAR0i3AgAAAAAAAAAAAAAAAAKAAAAAAIAAAAD/9ABAAX/+AAgAYAAAB//wAD/+gAAAA/+wAP/8ABwAEAEABgAAAA//gAX/7AAv/3/8AAf/oAF//QAYACAAgAc=",
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}),
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});
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class TelemetryDecodeError extends Error {
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constructor(message) {
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super(message);
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this.name = "TelemetryDecodeError";
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}
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}
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function extractBase64(input) {
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if (typeof input !== "string" || input.trim() === "") {
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throw new TelemetryDecodeError("Paste a telemetry reply or Base64 payload first.");
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}
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let text = input.trim();
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if (text.length > 4096) {
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throw new TelemetryDecodeError("The pasted value is too large to be a telemetry page.");
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}
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const replyLine = text
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.split(/\r?\n/)
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.map((line) => line.trim())
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.find((line) => /^>\s*[A-Za-z0-9+/]+={0,2}$/.test(line));
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if (replyLine) {
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text = replyLine.replace(/^>\s*/, "");
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} else {
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text = text
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.replace(/^```(?:text)?\s*/i, "")
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.replace(/```\s*$/, "")
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.trim()
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.replace(/^>\s*/, "")
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.replace(/\s+/g, "");
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}
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if (text === "") {
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throw new TelemetryDecodeError("The telemetry reply does not contain Base64 data.");
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}
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if (text.length % 4 !== 0) {
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throw new TelemetryDecodeError("Base64 length is invalid; copy the complete padded reply.");
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}
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const validBase64 = /^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$/;
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if (!validBase64.test(text)) {
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throw new TelemetryDecodeError("The reply is not valid standard padded Base64.");
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}
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return text;
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}
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function base64ToBytes(encoded) {
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let binary;
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try {
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if (typeof global.atob === "function") {
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binary = global.atob(encoded);
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} else if (typeof Buffer !== "undefined") {
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return Uint8Array.from(Buffer.from(encoded, "base64"));
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} else {
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throw new Error("No Base64 decoder is available");
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}
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} catch (_error) {
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throw new TelemetryDecodeError("The Base64 payload could not be decoded.");
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}
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const bytes = new Uint8Array(binary.length);
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for (let index = 0; index < binary.length; index += 1) {
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bytes[index] = binary.charCodeAt(index);
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}
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return bytes;
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}
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function uint32LE(bytes, offset) {
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return (
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bytes[offset] |
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(bytes[offset + 1] << 8) |
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(bytes[offset + 2] << 16) |
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(bytes[offset + 3] << 24)
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) >>> 0;
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}
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function int32LE(bytes, offset) {
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const value = uint32LE(bytes, offset);
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return value > 0x7fffffff ? value - 0x100000000 : value;
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}
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function readPackedBits(bytes, byteOffset, bitOffset, width) {
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let value = 0;
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const firstBit = byteOffset * 8 + bitOffset;
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for (let bit = 0; bit < width; bit += 1) {
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const absoluteBit = firstBit + bit;
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value =
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(value << 1) |
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((bytes[Math.floor(absoluteBit / 8)] >> (7 - (absoluteBit % 8))) & 1);
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}
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return value;
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}
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function signed14(value) {
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return value & 0x2000 ? value - 0x4000 : value;
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}
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function decodeHeader(bytes) {
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if (bytes.length < 7) {
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throw new TelemetryDecodeError("Telemetry payload is shorter than its seven-byte header.");
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}
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const header = {
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typeCode: bytes[0],
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firstEpoch: uint32LE(bytes, 1),
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intervalMinutes: bytes[5],
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count: bytes[6],
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byteLength: bytes.length,
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};
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if (header.intervalMinutes === 0) {
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throw new TelemetryDecodeError("Telemetry sample interval cannot be zero.");
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}
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if (header.count === 0) {
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throw new TelemetryDecodeError("Telemetry sample count cannot be zero.");
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}
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return header;
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}
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function assertLength(bytes, expected, label) {
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if (bytes.length !== expected) {
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throw new TelemetryDecodeError(
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`${label} payload should be ${expected} bytes for this sample count; received ${bytes.length}.`
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);
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}
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}
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function sampleEpoch(header, index) {
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return header.firstEpoch + index * header.intervalMinutes * 60;
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}
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function decodeTemperature(bytes, header) {
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const statusBytes = Math.ceil((header.count * 2) / 8);
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const valueBytes = Math.ceil((header.count * 7) / 8);
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assertLength(bytes, 7 + statusBytes + valueBytes, "Temperature");
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const rows = [];
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for (let index = 0; index < header.count; index += 1) {
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const statusCode = readPackedBits(bytes, 7, index * 2, 2);
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const rawCode = readPackedBits(bytes, 7 + statusBytes, index * 7, 7);
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let status;
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let valueC = null;
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if (statusCode === 0) {
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status = "Missing";
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} else if (statusCode === 1) {
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status = "Value";
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valueC = rawCode - 50;
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} else if (statusCode === 2) {
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status = "Below range";
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} else {
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status = "Above range";
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}
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rows.push({
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index,
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epoch: sampleEpoch(header, index),
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status,
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statusCode,
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rawCode,
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valueC,
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});
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}
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return {
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...header,
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kind: "temperature",
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label: "Temperature",
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rows,
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warnings: [],
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};
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}
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function decodeVoltage(bytes, header) {
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assertLength(bytes, 7 + header.count, "Voltage");
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const rows = [];
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for (let index = 0; index < header.count; index += 1) {
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const rawCode = bytes[7 + index];
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let status;
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let millivolts = null;
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if (rawCode === 0) {
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status = "Missing";
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} else if (rawCode === 1) {
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status = "Below range";
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} else if (rawCode === 255) {
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status = "Above range";
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} else {
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status = "Value";
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millivolts = 1880 + (rawCode - 2) * 10;
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}
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rows.push({
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index,
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epoch: sampleEpoch(header, index),
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status,
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rawCode,
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millivolts,
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});
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}
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return {
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...header,
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kind: "voltage",
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label: "Battery voltage",
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rows,
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warnings: [],
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};
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}
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function decodeGps(bytes, header) {
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if (bytes.length < 17) {
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throw new TelemetryDecodeError("GPS payload is shorter than its 17-byte header.");
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}
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const dataBytes = Math.ceil((header.count * 28) / 8);
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assertLength(bytes, 17 + dataBytes, "GPS");
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const originLatE7 = int32LE(bytes, 7);
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const originLonE7 = int32LE(bytes, 11);
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const originIndex = bytes[15];
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const flags = bytes[16];
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if (originIndex !== 0xff && originIndex >= header.count) {
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throw new TelemetryDecodeError(
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`GPS origin index ${originIndex} is outside the ${header.count}-sample page.`
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);
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}
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const warnings = [];
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if (flags & 0x01) {
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warnings.push(
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"At least one GPS differential was clipped to the signed 14-bit range; positions after it may be less accurate."
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);
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}
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if (flags & 0xfe) {
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warnings.push(`GPS flags contain unknown bits: 0x${flags.toString(16).padStart(2, "0")}.`);
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}
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if (originIndex !== 0xff) {
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warnings.push(
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"A 0 m / 0 m GPS differential after the origin is ambiguous: it can mean an unchanged fix, movement under the 10 m resolution, or no fix."
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);
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}
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if (
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originIndex !== 0xff &&
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(originLatE7 < -900000000 ||
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originLatE7 > 900000000 ||
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originLonE7 < -1800000000 ||
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originLonE7 > 1800000000)
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) {
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warnings.push("The GPS origin is outside the valid latitude/longitude range.");
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}
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let referenceLat = originLatE7 / 10000000;
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let referenceLon = originLonE7 / 10000000;
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let unexpectedPreOriginDelta = false;
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const rows = [];
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for (let index = 0; index < header.count; index += 1) {
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const bitOffset = index * 28;
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const northUnits = signed14(readPackedBits(bytes, 17, bitOffset, 14));
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const eastUnits = signed14(readPackedBits(bytes, 17, bitOffset + 14, 14));
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const northMeters = northUnits * 10;
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const eastMeters = eastUnits * 10;
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let latitude = null;
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let longitude = null;
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let status;
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let ambiguous = false;
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let possiblyClipped = false;
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if (originIndex === 0xff) {
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status = "No fix";
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if (northUnits !== 0 || eastUnits !== 0) unexpectedPreOriginDelta = true;
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} else if (index < originIndex) {
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status = "No fix";
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if (northUnits !== 0 || eastUnits !== 0) unexpectedPreOriginDelta = true;
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} else if (index === originIndex) {
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status = "Origin fix";
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latitude = referenceLat;
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longitude = referenceLon;
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if (northUnits !== 0 || eastUnits !== 0) {
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warnings.push("The GPS origin row contains a non-zero differential.");
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}
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} else if (northUnits === 0 && eastUnits === 0) {
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status = "Unchanged / no fix";
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ambiguous = true;
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} else {
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referenceLat += northMeters / METERS_PER_DEGREE;
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const longitudeScale =
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METERS_PER_DEGREE * Math.cos(referenceLat * DEGREES_TO_RADIANS);
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if (Math.abs(longitudeScale) > 0.001) {
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referenceLon += eastMeters / longitudeScale;
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}
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latitude = referenceLat;
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longitude = referenceLon;
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possiblyClipped =
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Boolean(flags & 0x01) &&
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[northUnits, eastUnits].some((value) => value === -8192 || value === 8191);
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status = possiblyClipped ? "Fix (clipped delta)" : "Fix";
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}
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rows.push({
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index,
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epoch: sampleEpoch(header, index),
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status,
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latitude,
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longitude,
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northMeters,
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eastMeters,
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ambiguous,
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possiblyClipped,
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});
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}
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if (unexpectedPreOriginDelta) {
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warnings.push("A no-fix row contains a non-zero GPS differential.");
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}
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return {
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...header,
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kind: "gps",
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label: "GPS",
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originLatE7,
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originLonE7,
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originIndex,
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flags,
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rows,
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warnings,
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};
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}
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function decodeTelemetry(input) {
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const encoded = extractBase64(input);
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const bytes = base64ToBytes(encoded);
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if (bytes.length === 0) {
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throw new TelemetryDecodeError("The Base64 payload decoded to zero bytes.");
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}
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const header = decodeHeader(bytes);
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let decoded;
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if (header.typeCode === TYPE_TEMPERATURE) {
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decoded = decodeTemperature(bytes, header);
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} else if (header.typeCode === TYPE_VOLTAGE) {
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decoded = decodeVoltage(bytes, header);
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} else if (header.typeCode === TYPE_GPS) {
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decoded = decodeGps(bytes, header);
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} else {
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throw new TelemetryDecodeError(
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`Unsupported telemetry type 0x${header.typeCode.toString(16).padStart(2, "0")}; expected 0x11, 0x12, or 0x13.`
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);
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}
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decoded.encoded = encoded;
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return decoded;
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}
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function timestampText(epoch, localTime) {
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const date = new Date(epoch * 1000);
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if (!Number.isFinite(date.getTime())) return "Invalid timestamp";
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if (!localTime) return date.toISOString().replace(".000Z", "Z");
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return new Intl.DateTimeFormat(undefined, {
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year: "numeric",
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month: "2-digit",
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day: "2-digit",
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hour: "2-digit",
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minute: "2-digit",
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second: "2-digit",
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timeZoneName: "short",
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}).format(date);
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}
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function tableModel(decoded, localTime) {
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const localZone =
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(Intl.DateTimeFormat().resolvedOptions() || {}).timeZone || "browser local";
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const timestampHeader = localTime ? `Timestamp (${localZone})` : "Timestamp (UTC)";
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if (decoded.kind === "temperature") {
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return {
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headers: ["#", timestampHeader, "Status", "Temperature", "Raw status/code"],
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rows: decoded.rows.map((row) => ({
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muted: row.status === "Missing",
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values: [
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row.index + 1,
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timestampText(row.epoch, localTime),
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row.status,
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row.status === "Below range"
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? "< -50 °C"
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: row.status === "Above range"
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? "> 77 °C"
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: row.valueC === null
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? "—"
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: `${row.valueC} °C`,
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`${row.statusCode} / ${row.rawCode}`,
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],
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})),
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};
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}
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if (decoded.kind === "voltage") {
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return {
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headers: ["#", timestampHeader, "Status", "Battery voltage", "Raw code"],
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rows: decoded.rows.map((row) => ({
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muted: row.status === "Missing",
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values: [
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row.index + 1,
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timestampText(row.epoch, localTime),
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row.status,
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row.status === "Below range"
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? "< 1.88 V"
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: row.status === "Above range"
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? "> 4.40 V"
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: row.millivolts === null
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? "—"
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: `${(row.millivolts / 1000).toFixed(2)} V`,
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row.rawCode,
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],
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})),
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};
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}
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return {
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headers: [
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"#",
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timestampHeader,
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"Status",
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"Latitude",
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"Longitude",
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"North Δ",
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"East Δ",
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],
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rows: decoded.rows.map((row) => ({
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muted: row.status === "No fix" || row.ambiguous,
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values: [
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row.index + 1,
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timestampText(row.epoch, localTime),
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row.status,
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row.latitude === null ? "—" : row.latitude.toFixed(7),
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row.longitude === null ? "—" : row.longitude.toFixed(7),
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`${row.northMeters} m`,
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`${row.eastMeters} m`,
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],
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})),
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};
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}
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function summaryItems(decoded, localTime) {
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const lastEpoch = sampleEpoch(decoded, decoded.count - 1);
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const items = [
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["Payload", `${decoded.label} (0x${decoded.typeCode.toString(16)})`],
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["Samples", String(decoded.count)],
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["Interval", `${decoded.intervalMinutes} minutes`],
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["First sample", timestampText(decoded.firstEpoch, localTime)],
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["Last sample", timestampText(lastEpoch, localTime)],
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["Decoded size", `${decoded.byteLength} bytes`],
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];
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if (decoded.kind === "gps") {
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items.push([
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"Origin",
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decoded.originIndex === 0xff
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? "No fix on page"
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: `row ${decoded.originIndex + 1}: ${(decoded.originLatE7 / 1e7).toFixed(7)}, ${(decoded.originLonE7 / 1e7).toFixed(7)}`,
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]);
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items.push(["GPS flags", `0x${decoded.flags.toString(16).padStart(2, "0")}`]);
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}
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return items;
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}
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function csvCell(value) {
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const text = String(value);
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return /[",\r\n]/.test(text) ? `"${text.replace(/"/g, '""')}"` : text;
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}
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function modelToCsv(model) {
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return [model.headers, ...model.rows.map((row) => row.values)]
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.map((row) => row.map(csvCell).join(","))
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.join("\r\n");
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}
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function appendCell(row, tagName, value) {
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const cell = document.createElement(tagName);
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cell.textContent = String(value);
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row.appendChild(cell);
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}
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function initializeDecoder() {
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const root = document.querySelector("[data-telemetry-decoder]");
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if (!root) return;
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const input = root.querySelector("[data-role='input']");
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const decodeButton = root.querySelector("[data-role='decode']");
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const clearButton = root.querySelector("[data-role='clear']");
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const downloadButton = root.querySelector("[data-role='download']");
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const localTime = root.querySelector("[data-role='local-time']");
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const errorBox = root.querySelector("[data-role='error']");
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const results = root.querySelector("[data-role='results']");
|
|
const resultTitle = root.querySelector("[data-role='result-title']");
|
|
const summary = root.querySelector("[data-role='summary']");
|
|
const warningBox = root.querySelector("[data-role='warnings']");
|
|
const warningList = root.querySelector("[data-role='warning-list']");
|
|
const table = root.querySelector("[data-role='table']");
|
|
let current = null;
|
|
|
|
root.querySelectorAll("[data-example-reply]").forEach((element) => {
|
|
const example = EXAMPLES[element.getAttribute("data-example-reply")];
|
|
if (example) element.textContent = example.reply;
|
|
});
|
|
|
|
function hideError() {
|
|
errorBox.hidden = true;
|
|
errorBox.textContent = "";
|
|
}
|
|
|
|
function showError(error) {
|
|
current = null;
|
|
results.hidden = true;
|
|
errorBox.textContent = error instanceof Error ? error.message : String(error);
|
|
errorBox.hidden = false;
|
|
}
|
|
|
|
function render() {
|
|
if (!current) return;
|
|
const useLocalTime = localTime.checked;
|
|
const model = tableModel(current, useLocalTime);
|
|
resultTitle.textContent = `${current.label} telemetry`;
|
|
|
|
summary.replaceChildren();
|
|
summaryItems(current, useLocalTime).forEach(([term, description]) => {
|
|
const item = document.createElement("div");
|
|
const dt = document.createElement("dt");
|
|
const dd = document.createElement("dd");
|
|
dt.textContent = term;
|
|
dd.textContent = description;
|
|
item.append(dt, dd);
|
|
summary.appendChild(item);
|
|
});
|
|
|
|
warningList.replaceChildren();
|
|
current.warnings.forEach((warning) => {
|
|
const item = document.createElement("li");
|
|
item.textContent = warning;
|
|
warningList.appendChild(item);
|
|
});
|
|
warningBox.hidden = current.warnings.length === 0;
|
|
|
|
table.replaceChildren();
|
|
const head = document.createElement("thead");
|
|
const headRow = document.createElement("tr");
|
|
model.headers.forEach((header) => appendCell(headRow, "th", header));
|
|
head.appendChild(headRow);
|
|
table.appendChild(head);
|
|
|
|
const body = document.createElement("tbody");
|
|
model.rows.forEach((modelRow) => {
|
|
const row = document.createElement("tr");
|
|
if (modelRow.muted) row.classList.add("telemetry-row-muted");
|
|
modelRow.values.forEach((value) => appendCell(row, "td", value));
|
|
body.appendChild(row);
|
|
});
|
|
table.appendChild(body);
|
|
results.hidden = false;
|
|
}
|
|
|
|
function decodeInput() {
|
|
hideError();
|
|
try {
|
|
current = decodeTelemetry(input.value);
|
|
render();
|
|
} catch (error) {
|
|
showError(error);
|
|
}
|
|
}
|
|
|
|
decodeButton.addEventListener("click", decodeInput);
|
|
clearButton.addEventListener("click", () => {
|
|
input.value = "";
|
|
current = null;
|
|
results.hidden = true;
|
|
hideError();
|
|
input.focus();
|
|
});
|
|
localTime.addEventListener("change", render);
|
|
input.addEventListener("keydown", (event) => {
|
|
if (event.key === "Enter" && (event.ctrlKey || event.metaKey)) {
|
|
event.preventDefault();
|
|
decodeInput();
|
|
}
|
|
});
|
|
|
|
root.querySelectorAll("[data-telemetry-example]").forEach((button) => {
|
|
button.addEventListener("click", () => {
|
|
const example = EXAMPLES[button.getAttribute("data-telemetry-example")];
|
|
if (!example) return;
|
|
input.value = example.reply;
|
|
decodeInput();
|
|
});
|
|
});
|
|
|
|
downloadButton.addEventListener("click", () => {
|
|
if (!current) return;
|
|
const csv = modelToCsv(tableModel(current, localTime.checked));
|
|
const blob = new Blob([csv], { type: "text/csv;charset=utf-8" });
|
|
const url = URL.createObjectURL(blob);
|
|
const link = document.createElement("a");
|
|
link.href = url;
|
|
link.download = `meshcore-telemetry-${current.kind}.csv`;
|
|
document.body.appendChild(link);
|
|
link.click();
|
|
link.remove();
|
|
URL.revokeObjectURL(url);
|
|
});
|
|
|
|
const requestedExample = new URLSearchParams(global.location.search).get("example");
|
|
if (requestedExample && EXAMPLES[requestedExample]) {
|
|
input.value = EXAMPLES[requestedExample].reply;
|
|
decodeInput();
|
|
}
|
|
}
|
|
|
|
const api = Object.freeze({
|
|
EXAMPLES,
|
|
TelemetryDecodeError,
|
|
decodeTelemetry,
|
|
extractBase64,
|
|
tableModel,
|
|
modelToCsv,
|
|
});
|
|
|
|
global.MeshCoreTelemetryDecoder = api;
|
|
if (typeof module === "object" && module.exports) module.exports = api;
|
|
|
|
if (typeof document !== "undefined") {
|
|
if (document.readyState === "loading") {
|
|
document.addEventListener("DOMContentLoaded", initializeDecoder, { once: true });
|
|
} else {
|
|
initializeDecoder();
|
|
}
|
|
}
|
|
})(typeof globalThis !== "undefined" ? globalThis : this);
|