MILESIGHT - Em500 Smtc

Codec Preview

/* eslint-disable no-use-before-define */ /* eslint-disable no-plusplus */ /** * Payload Decoder for The Things Network * * Copyright 2021 Milesight IoT * * @product EM500-SMTC */ function Decoder(bytes) { const decoded = {}; for (let i = 0; i < bytes.length;) { const channel_id = bytes[i++]; const channel_type = bytes[i++]; // BATTERY if (channel_id === 0x01 && channel_type === 0x75) { decoded.battery = bytes[i]; i += 1; } // TEMPERATURE else if (channel_id === 0x03 && channel_type === 0x67) { // ℃ decoded.temperature = readInt16LE(bytes.slice(i, i + 2)) / 10; i += 2; // ℉ // decoded.temperature = readInt16LE(bytes.slice(i, i + 2)) / 10 * 1.8 + 32; // i +=2; } // HUMIDITY // old resolution 0.5 else if (channel_id === 0x04 && channel_type === 0x68) { decoded.humidity = bytes[i] / 2; i += 1; } // new resolution 0.01 else if (channel_id === 0x04 && channel_type === 0xCA) { decoded.humidity = readUInt16LE(bytes.slice(i, i + 2)) / 100; i += 2; } // EC else if (channel_id === 0x05 && channel_type === 0x7F) { decoded.ec = readUInt16LE(bytes.slice(i, i + 2)); i += 2; } else { break; } } return decoded; } /* ****************************************** * bytes to number ******************************************* */ function readUInt16LE(bytes) { const value = (bytes[1] << 8) + bytes[0]; return value & 0xffff; } function readInt16LE(bytes) { const ref = readUInt16LE(bytes); return ref > 0x7fff ? ref - 0x10000 : ref; } const ignore_vars = ["metadata", "downlink_url", "fcnt", "port", "raw_packet"]; function toTagoFormat(object_item, serie, prefix = "") { const result = []; for (const key in object_item) { if (ignore_vars.includes(key)) continue; if (typeof object_item[key] === "object") { result.push({ variable: object_item[key].variable || `${prefix}${key}`, value: object_item[key].value, serie: object_item[key].serie || serie, metadata: object_item[key].metadata, location: object_item[key].location, unit: object_item[key].unit, }); } else { result.push({ variable: `${prefix}${key}`, value: object_item[key], serie, }); } } return result; } const payload_raw = payload.find((x) => x.variable === "payload_raw" || x.variable === "payload" || x.variable === "data"); if (payload_raw) { try { // Convert the data from Hex to Javascript Buffer. const buffer = Buffer.from(payload_raw.value, "hex"); const serie = new Date().getTime(); let payload_aux = Decoder(buffer); payload_aux = toTagoFormat(payload_aux, serie); payload = payload.concat(payload_aux.map((x) => ({ ...x, serie }))); } catch (e) { // Print the error to the Live Inspector. console.error(e); // Return the variable parse_error for debugging. payload = [{ variable: "parse_error", value: e.message }]; } }