TTN Smart Sensor (Dingtek)

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//IEEE754 hex to float convert function hex2float(num) { var sign = num & 0x80000000 ? -1 : 1; var exponent = ((num >> 23) & 0xff) - 127; var mantissa = 1 + (num & 0x7fffff) / 0x7fffff; return sign * mantissa * Math.pow(2, exponent); } function decodeUplink(input) { if (input.fPort != 3) { return { errors: ['unknown FPort'], }; } switch (input.bytes.length) { case 18: return { // Decoded data data: { level: (input.bytes[5] << 8) + input.bytes[6], alarmLevel: Boolean(input.bytes[11] >> 4), alarmBattery: Boolean(input.bytes[12] & 0x0f), temperature: input.bytes[8], volt: ((input.bytes[13] << 8) + input.bytes[14]) / 100, frameCounter: (input.bytes[15] << 8) + input.bytes[16], }, }; case 12: return { // Decoded data data: { firmware: input.bytes[5] + "." +input.bytes[6], uploadInterval: input.bytes[7], detectInterval: input.bytes[8], levelThreshold: input.bytes[9], workMode: input.bytes[10], }, }; default: return { errors: ['wrong length'], }; } } // Encode downlink function. // // Input is an object with the following fields: // - data = Object representing the payload that must be encoded. // - variables = Object containing the configured device variables. // // Output must be an object with the following fields: // - bytes = Byte array containing the downlink payload. function encodeDownlink(input) { if (input.data.uploadInterval != null && !isNaN(input.data.uploadInterval)) { var uploadInterval = input.data.uploadInterval; var uploadInterval_high = uploadInterval.toString(16).padStart(2, '0').toUpperCase()[0].charCodeAt(0); var uploadInterval_low = uploadInterval.toString(16).padStart(2, '0').toUpperCase()[1].charCodeAt(0); if (uploadInterval > 255 || uploadInterval < 1) { return { errors: ['upload interval range 1-255 hours.'], }; } else { return { // LoRaWAN FPort used for the downlink message fPort: 3, // Encoded bytes bytes: [0x38, 0x30, 0x30, 0x32, 0x39, 0x39, 0x39, 0x39, 0x30, 0x31, uploadInterval_high, uploadInterval_low, 0x38, 0x31], }; } } if (input.data.detectInterval != null && !isNaN(input.data.detectInterval)) { var detectInterval = input.data.detectInterval; var detectInterval_high = detectInterval.toString(16).padStart(2, '0').toUpperCase()[0].charCodeAt(0); var detectInterval_low = detectInterval.toString(16).padStart(2, '0').toUpperCase()[1].charCodeAt(0); if (detectInterval > 255 || detectInterval < 1) { return { errors: ['detection interval range 1-255 minutes.'], }; } else { return { // LoRaWAN FPort used for the downlink message fPort: 3, // Encoded bytes bytes: [0x38, 0x30, 0x30, 0x32, 0x39, 0x39, 0x39, 0x39, 0x30, 0x38, detectInterval_high, detectInterval_low, 0x38, 0x31], }; } } if (input.data.levelThreshold != null && !isNaN(input.data.levelThreshold)) { var levelThreshold = input.data.levelThreshold; var levelThreshold_high = levelThreshold.toString(16).padStart(2, '0').toUpperCase()[0].charCodeAt(0); var levelThreshold_low = levelThreshold.toString(16).padStart(2, '0').toUpperCase()[1].charCodeAt(0); if (levelThreshold > 3 || levelThreshold < 1) { return { errors: ['Air quality alarm threshold range 1-3.'], }; } else { return { // LoRaWAN FPort used for the downlink message fPort: 3, // Encoded bytes bytes: [0x38, 0x30, 0x30, 0x32, 0x39, 0x39, 0x39, 0x39, 0x30, 0x32, levelThreshold_high, levelThreshold_low, 0x38, 0x31], }; } } if (input.data.workMode != null && !isNaN(input.data.workMode)) { var workMode = input.data.workMode; if (workMode === 0) { return { // LoRaWAN FPort used for the downlink message fPort: 3, // Encoded bytes bytes: [0x38, 0x30, 0x30, 0x32, 0x39, 0x39, 0x39, 0x39, 0x30, 0x39, 0x30, 0x35, 0x38, 0x31], }; } else if(workMode === 1) { return { // LoRaWAN FPort used for the downlink message fPort: 3, // Encoded bytes bytes: [0x38, 0x30, 0x30, 0x32, 0x39, 0x39, 0x39, 0x39, 0x30, 0x39, 0x30, 0x36, 0x38, 0x31], }; }else{ return { errors: ['Work mode range 0-1.'], } } } return { errors: ['invalid downlink parameter.'], }; } function decodeDownlink(input) { var input_length = input.bytes.length; if (input.fPort != 3) { return { errors: ['invalid FPort.'], }; } if ( input_length < 12 || input.bytes[0] != 0x38 || input.bytes[1] != 0x30 || input.bytes[2] != 0x30 || input.bytes[3] != 0x32 || input.bytes[4] != 0x39 || input.bytes[5] != 0x39 || input.bytes[6] != 0x39 || input.bytes[7] != 0x39 || input.bytes[input_length - 2] != 0x38 || input.bytes[input_length - 1] != 0x31 ) { return { errors: ['invalid format.'], }; } var option = parseInt(String.fromCharCode(input.bytes[8]) + String.fromCharCode(input.bytes[9]), 16); var value = parseInt(String.fromCharCode(input.bytes[10]) + String.fromCharCode(input.bytes[11]), 16); switch (option) { case 1: return { data: { uploadInterval: value, }, }; case 8: return { data: { detectInterval: value, }, }; case 2: return { data: { levelThreshold: value, }, }; case 9: switch (value) { case 0x05: return { data: { workMode: 0, }, }; case 0x06: return { data: { workMode: 1, }, }; default: return { errors: ['invalid parameter value.'], }; } default: return { errors: ['invalid parameter key.'], }; } }