/** * Payload Decoder for Chirpstack and Milesight network server * * Copyright 2021 Milesight IoT * * @product AM307 / AM319 */ function Decode(fPort, bytes) { var decoded = {}; decoded.devEUI = LoRaObject.devEUI; decoded.rssi = LoRaObject.rxInfo[0].rssi; for (var i = 0; i < bytes.length;) { var channel_id = bytes[i++]; var 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 else if (channel_id === 0x04 && channel_type === 0x68) { decoded.humidity = bytes[i] / 2; i += 1; } // PIR else if (channel_id === 0x05 && channel_type === 0x00) { decoded.pir = bytes[i] === 1 ? "trigger": "idle"; i += 1; } // LIGHT else if (channel_id === 0x06 && channel_type === 0xCB) { decoded.light_level = bytes[i]; i += 1; } // CO2 else if (channel_id === 0x07 && channel_type === 0x7D) { decoded.co2 = readUInt16LE(bytes.slice(i, i + 2)); i += 2; } // TVOC else if (channel_id === 0x08 && channel_type === 0x7D) { decoded.tvoc = readUInt16LE(bytes.slice(i, i + 2)); i += 2; } // PRESSURE else if (channel_id === 0x09 && channel_type === 0x73) { decoded.pressure = readUInt16LE(bytes.slice(i, i + 2)) / 10; i += 2; } // HCHO else if (channel_id === 0x0A && channel_type === 0x7D) { decoded.hcho = readUInt16LE(bytes.slice(i, i + 2)) / 100; i += 2; } // PM2.5 else if (channel_id === 0x0B && channel_type === 0x7D) { decoded.pm2_5 = readUInt16LE(bytes.slice(i, i + 2)); i += 2; } // PM10 else if (channel_id === 0x0C && channel_type === 0x7D) { decoded.pm10 = readUInt16LE(bytes.slice(i, i + 2)); i += 2; } // O3 else if (channel_id === 0x0D && channel_type === 0x7D) { decoded.o3 = readUInt16LE(bytes.slice(i, i + 2)) / 100; i += 2; } // BEEP else if (channel_id === 0x0E && channel_type === 0x01) { decoded.beep = bytes[i] === 1 ? "yes" : "no"; i += 1; } else { break; } } return decoded; } /* ****************************************** * bytes to number ********************************************/ function readUInt16LE(bytes) { var value = (bytes[1] << 8) + bytes[0]; return value & 0xffff; } function readInt16LE(bytes) { var ref = readUInt16LE(bytes); return ref > 0x7fff ? ref - 0x10000 : ref; }