106 lines
2.8 KiB
JavaScript
106 lines
2.8 KiB
JavaScript
// ChirpStack v4+ Codec (JavaScript)
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// LSN50 v2.x - Production codec for PA12 + Downlink control (TDC + 5VT)
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//
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// Verified mapping (uplink): PA12 = bytes[6] bit1 (0x02) on FPort 2 (MOD=1, 11 bytes)
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// Downlink commands (Dragino common):
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// - Set TDC (seconds): 0x01 + 3 bytes (big-endian)
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// - Set 5VT (ms): 0x07 + 2 bytes (big-endian)
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const CFG = {
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INVERT_LOGIC: false,
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EXPECTED_UP_FPORT: 2,
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EXPECTED_UP_LEN: 11,
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CMD_FPORT: 2,
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LIMITS: {
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TDC_SEC_MIN: 5,
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TDC_SEC_MAX: 86400,
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VT_MS_MIN: 0,
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VT_MS_MAX: 60000
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}
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};
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function decodeUplink(input) {
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const b = input.bytes || [];
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const fPort = input.fPort;
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const rawHex = b.map(x => x.toString(16).padStart(2, "0")).join("");
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const byte6 = (b.length > 6) ? b[6] : 0x00;
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const pa12 = (byte6 & 0x02) ? 1 : 0;
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const drenaje = CFG.INVERT_LOGIC ? (pa12 ? 0 : 1) : pa12;
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const warnings = [];
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if (fPort !== CFG.EXPECTED_UP_FPORT) warnings.push(`Unexpected fPort=${fPort}, expected ${CFG.EXPECTED_UP_FPORT}`);
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if (b.length !== CFG.EXPECTED_UP_LEN) warnings.push(`Unexpected payload length=${b.length}, expected ${CFG.EXPECTED_UP_LEN}`);
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return {
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data: {
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drenaje,
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pa12,
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byte6,
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payload_len: b.length,
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payload_hex: rawHex,
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warnings: warnings.length ? warnings : undefined
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}
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};
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}
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function u16be(n) {
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return [(n >> 8) & 0xff, n & 0xff];
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}
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function u24be(n) {
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return [(n >> 16) & 0xff, (n >> 8) & 0xff, n & 0xff];
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}
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function assertInt(name, v) {
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if (typeof v !== "number" || !isFinite(v) || Math.floor(v) !== v) {
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throw new Error(`${name} must be an integer`);
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}
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}
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function clampInt(name, v, min, max) {
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assertInt(name, v);
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if (v < min || v > max) throw new Error(`${name} out of range [${min}, ${max}]: ${v}`);
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return v;
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}
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function encodeDownlink(input) {
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const data = (input && input.data) ? input.data : {};
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const cmd = data.cmd;
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if (!cmd) {
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return { bytes: [] };
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}
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if (cmd === "set_tdc") {
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const tdc = clampInt("tdc_sec", data.tdc_sec, CFG.LIMITS.TDC_SEC_MIN, CFG.LIMITS.TDC_SEC_MAX);
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const bytes = [0x01].concat(u24be(tdc));
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return {
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fPort: CFG.CMD_FPORT,
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bytes
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};
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}
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if (cmd === "set_5vt") {
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const vt = clampInt("vt_ms", data.vt_ms, CFG.LIMITS.VT_MS_MIN, CFG.LIMITS.VT_MS_MAX);
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const bytes = [0x07].concat(u16be(vt));
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return {
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fPort: CFG.CMD_FPORT,
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bytes
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};
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}
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if (cmd === "profile_active") {
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const vt = clampInt("vt_ms", (data.vt_ms ?? 2000), CFG.LIMITS.VT_MS_MIN, CFG.LIMITS.VT_MS_MAX);
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const bytes = [0x07].concat(u16be(vt));
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return { fPort: CFG.CMD_FPORT, bytes };
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}
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if (cmd === "profile_sleep") {
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const vt = clampInt("vt_ms", (data.vt_ms ?? 0), CFG.LIMITS.VT_MS_MIN, CFG.LIMITS.VT_MS_MAX);
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const bytes = [0x07].concat(u16be(vt));
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return { fPort: CFG.CMD_FPORT, bytes };
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}
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throw new Error(`Unknown cmd: ${cmd}`);
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} |