MILESIGHT - Vs121

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/* eslint-disable no-plusplus */ /** * Payload Decoder for The Things Network * * Copyright 2020 Milesight IoT * * @product VS121 */ // bytes to number function readUInt16BE(bytes) { const value = (bytes[0] << 8) + bytes[1]; return value & 0xffff; } 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; } // bytes to version function readVersion(bytes) { const temp = []; for (let idx = 0; idx < bytes.length; idx++) { temp.push((bytes[idx] & 0xff).toString(10)); } return temp.join("."); } // bytes to string function readString(bytes) { const temp = []; for (let idx = 0; idx < bytes.length; idx++) { temp.push(`0${(bytes[idx] & 0xff).toString(16)}`.slice(-2)); } return temp.join(""); } function Decoder(bytes) { const decoded = {}; for (let i = 0; i < bytes.length; ) { const channel_id = bytes[i++]; const channel_type = bytes[i++]; // PROTOCOL VESION if (channel_id === 0xff && channel_type === 0x01) { decoded.protocol_version = bytes[i]; i += 1; } // SERIAL NUMBER else if (channel_id === 0xff && channel_type === 0x08) { decoded.sn = readString(bytes.slice(i, i + 6)); i += 6; } // HARDWARE VERSION else if (channel_id === 0xff && channel_type === 0x09) { decoded.hardware_version = readVersion(bytes.slice(i, i + 2)); i += 2; } // FIRMWARE VERSION else if (channel_id === 0xff && channel_type === 0x0a) { decoded.firmware_version = readVersion(bytes.slice(i, i + 4)); i += 4; } // PEOPLE COUNTER else if (channel_id === 0x04 && channel_type === 0xc9) { decoded.people_counter_all = bytes[i]; decoded.region_count = bytes[i + 1]; const region = readUInt16BE(bytes.slice(i + 2, i + 4)); for (let idx = 0; idx < decoded.region_count; idx++) { const tmp = `region_${idx}`; decoded[tmp] = (region > idx) & 1; } i += 4; } // PEOPLE IN/OUT else if (channel_id === 0x05 && channel_type === 0xcc) { decoded.in = readInt16LE(bytes.slice(i, i + 2)); decoded.out = readInt16LE(bytes.slice(i + 2, i + 4)); i += 4; } // PEOPLE MAX else if (channel_id === 0x06 && channel_type === 0xcd) { decoded.people_max = bytes[i]; i += 1; } else { break; } } return decoded; } const ignore_vars = []; 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 }]; } }