//e.g. parseSigFox('10b67dcc0006efda3d9816c2') //In an attempt to make the code clearer, I will not be using ArrayBuffer function hex2Bytes(val) { if (!val) { return []; } val = val.trim(); if (val.startsWith('0x')) { val = val.substring(2); //get rid of starting '0x' } var numBytes = val.length / 2; var bytes = []; for (var i = 0; i < numBytes; i++) { bytes.push(parseInt(val.substring(i*2, (i*2) + 2), 16)); } return bytes; } function parseLittleEndianInt32(buffer, offset) { return (buffer[offset + 3] << 24) + (buffer[offset + 2] << 16) + (buffer[offset + 1] << 8) + (buffer[offset]); } function parseLittleEndianInt16(buffer, offset) { return (buffer[offset + 1] << 8) + (buffer[offset]); } function parseLittleEndianInt16Bits(buffer, offset, bitOffset, bitLength) { var temp = parseLittleEndianInt16(buffer, offset); temp = temp >> bitOffset; var mask = 0xffff >> (16 - bitLength); return temp & mask; } //e.g. 10b67dcc0006efda3d9816c2 function parseSigFox(data) { var buffer = hex2Bytes(data); if (!buffer) { return null; } var recordType = buffer[0] & 0x0f; switch (recordType) { case 0: //positional data return parsePositionalData(buffer); case 1: //downlink ACK return parseDownlinkAck(buffer); case 2: //device data return parseDeviceStats(buffer); case 3: //extended positional data return parseExtendedData(buffer); default: return null; } } function parsePositionalData(buffer) { var flags = buffer[0] & 0xF0; var inTrip = (flags & 0x10) > 0; var lastFixFailed = (flags & 0x20) > 0; var latitudeRaw = parseLittleEndianInt32(buffer, 1); var longitudeRaw = parseLittleEndianInt32(buffer, 5); var headingRaw = buffer[9]; var speedRaw = buffer[10]; var batteryRaw = buffer[11]; return { MessageType: 0, InTrip: inTrip, LastFixFailed: lastFixFailed, Latitude: latitudeRaw * 1e-7, Longitude: longitudeRaw * 1e-7, Heading: headingRaw * 2, SpeedKmH: speedRaw, BatteryVoltage: (batteryRaw * 25) / 1000.0 }; } function parseDownlinkAck(buffer) { var flags = buffer[0] & 0xF0; var downlinkAccepted = (flags & 0x10) > 0; var firmwareMajor = buffer[2]; var firmwareMinor = buffer[3]; var data = []; for (var i = 0; i < 8; i++) { data.push(i + 4); } return { MessageType: 1, DownlinkAccepted: downlinkAccepted, FirmwareVersion: firmwareMajor + '.' + firmwareMinor, DownlinkData: data }; } function parseDeviceStats(buffer) { var uptimeWeeks = parseLittleEndianInt16Bits(buffer, 0, 4, 9/*bits*/); var txCountRaw = parseLittleEndianInt16Bits(buffer, 1, 5, 11 /*bits*/); var rxCountRaw = buffer[3]; var tripCountRaw = parseLittleEndianInt16Bits(buffer, 4, 0, 13 /*bits*/); var gpsSuccessRaw = parseLittleEndianInt16Bits(buffer, 5, 5, 10 /*bits*/); var gpsFailuresRaw = parseLittleEndianInt16Bits(buffer, 6, 7, 8 /*bits*/); var averageFixTime = parseLittleEndianInt16Bits(buffer, 7, 7, 9/*bits*/); var averageFailTime = parseLittleEndianInt16Bits(buffer, 9, 0, 9/*bits*/); var averageFreshenTime = parseLittleEndianInt16Bits(buffer, 10, 1, 8/*bits*/); var wakeupsPerTrip = buffer[11] >> 1; return { MessageType: 2, UptimeWeeks: uptimeWeeks, TxCount: txCountRaw * 32, RxCount: rxCountRaw * 32, TripCount: tripCountRaw, GpsSuccessCount: gpsSuccessRaw * 32, GpsFailureCount: gpsFailuresRaw * 32, AverageFixTimeSeconds: averageFixTime, AverageFailTimeSeconds: averageFailTime, AverageFreshenTimeSeconds: averageFreshenTime, WakeUpsPerTrip: wakeupsPerTrip }; } function parseExtendedData(buffer) { var headingRaw = buffer[0] >> 4; var latitudeRaw = buffer[1] + buffer[2] * 256 + buffer[3] * 65536; if (latitudeRaw >= 0x800000) // 2^23 latitudeRaw -= 0x1000000; // 2^24 var longitudeRaw = buffer[4] + buffer[5] * 256 + buffer[6] * 65536; if (longitudeRaw >= 0x800000) // 2^23 longitudeRaw -= 0x1000000; // 2^24 var posAccRaw = buffer[7]; var batteryRaw = buffer[8]; var speedRaw = buffer[9] & 0x3F; var inTrip = (buffer[9] & 0x40) > 0; var lastFixFailed = (buffer[9] & 0x80) > 0; return { MessageType: 3, Heading: headingRaw * 22.5, Latitude: (latitudeRaw * 256) / 1e7, Longitude: (longitudeRaw * 256) / 1e7, PosAccM: posAccRaw * 1, BatteryVoltage: (batteryRaw * 25) / 1000.0, SpeedKmH: speedRaw * 2.5, InTrip: inTrip, LastFixFailed: lastFixFailed }; } function toTagoFormat(object_item, serie, prefix = '') { const result = []; for (const key in object_item) { // if (ignore_vars.includes(key)) continue; // ignore chosen vars result.push({ variable: `${prefix}${key}`, value: object_item[key], serie, }); } return result; } // Find the variable data from the payload, ignore the parse if the variable was not sent. let data = payload.find(x => x.variable ==='data'); if (data) { // get the data serie or generate a new one. const serie = data.serie || new Date().getTime(); data = data.value; const vars_to_tago = parseSigFox(data); let location; if (vars_to_tago.Longitude && vars_to_tago.Latitude) { location = { variable : 'location', value: `${vars_to_tago.Latitude}, ${vars_to_tago.Longitude}`, location: { lat: vars_to_tago.Latitude, lng: vars_to_tago.Longitude }, serie, }; delete vars_to_tago.Latitude; delete vars_to_tago.Longitude; } payload = toTagoFormat(vars_to_tago, serie); if (location) payload.push(location); // payload.push({ variable: 'payload_raw', value: data, serie }); // uncomment this line to maintain the raw payload. // Here's an example of how to add unit to a temperature variable. You can replicate the following code to do other changes // Ex: // const temp_var = payload.find(x => x.variable == 'temperature'); // if (temp_var) { temp_var.unit = "C"; } }

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