271 lines
7.7 KiB
JavaScript
271 lines
7.7 KiB
JavaScript
// Decoder for device payload encoder "PACKED"
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// copy&paste to TTN Console -> Applications -> PayloadFormat -> Decoder
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function Decoder(bytes, port) {
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var decoded = {};
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if (bytes.length === 0) {
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return {};
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}
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if (port === 1) {
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// only wifi counter data, no gps
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if (bytes.length === 2) {
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return decode(bytes, [uint16], ['wifi']);
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}
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// wifi + ble counter data, no gps
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if (bytes.length === 4) {
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return decode(bytes, [uint16, uint16], ['wifi', 'ble']);
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}
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// combined wifi counter and gps data
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if (bytes.length === 15) {
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return decode(bytes, [uint16, latLng, latLng, uint8, hdop, altitude], ['wifi', 'latitude', 'longitude', 'sats', 'hdop', 'altitude']);
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}
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// combined wifi + ble counter and gps data
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if (bytes.length === 17) {
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return decode(bytes, [uint16, uint16, latLng, latLng, uint8, hdop, altitude], ['wifi', 'ble', 'latitude', 'longitude', 'sats', 'hdop', 'altitude']);
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}
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}
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if (port === 2) {
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// device status data
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if (bytes.length === 17) {
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return decode(bytes, [uint16, uptime, uint8, uint32, uint8, uint8], ['voltage', 'uptime', 'cputemp', 'memory', 'reset0', 'reset1']);
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}
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}
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if (port === 3) {
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// device config data
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return decode(bytes, [uint8, uint8, uint16, uint8, uint8, uint8, uint8, bitmap1, bitmap2, version], ['lorasf', 'txpower', 'rssilimit', 'sendcycle', 'wifichancycle', 'blescantime', 'rgblum', 'flags', 'payloadmask', 'version']);
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}
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if (port === 4) {
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// gps data
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return decode(bytes, [latLng, latLng, uint8, hdop, altitude], ['latitude', 'longitude', 'sats', 'hdop', 'altitude']);
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}
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if (port === 5) {
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// button pressed
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return decode(bytes, [uint8], ['button']);
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}
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if (port === 6) {
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// beacon proximity alarm
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return decode(bytes, [uint8, uint8], ['rssi', 'beacon']);
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}
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if (port === 7) {
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// BME680 sensor data
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return decode(bytes, [float, uint16, ufloat, ufloat], ['temperature', 'pressure', 'humidity', 'air']);
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}
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if (port === 8) {
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// battery voltage
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return decode(bytes, [uint16], ['voltage']);
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}
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if (port === 9) {
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// timesync request
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if (bytes.length === 1) {
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decoded.timesync_seqno = bytes[0];
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return decoded;
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}
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// epoch time answer
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if (bytes.length === 5) {
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return decode(bytes, [uint32, uint8], ['time', 'timestatus']);
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}
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}
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}
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// ----- contents of /src/decoder.js --------------------------------------------
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// https://github.com/thesolarnomad/lora-serialization/blob/master/src/decoder.js
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var bytesToInt = function (bytes) {
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var i = 0;
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for (var x = 0; x < bytes.length; x++) {
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i |= (bytes[x] << (x * 8));
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}
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return i;
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};
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var version = function (bytes) {
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if (bytes.length !== version.BYTES) {
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throw new Error('version must have exactly 10 bytes');
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}
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return String.fromCharCode.apply(null, bytes).split('\u0000')[0];
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};
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version.BYTES = 10;
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var uint8 = function (bytes) {
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if (bytes.length !== uint8.BYTES) {
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throw new Error('uint8 must have exactly 1 byte');
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}
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return bytesToInt(bytes);
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};
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uint8.BYTES = 1;
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var uint16 = function (bytes) {
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if (bytes.length !== uint16.BYTES) {
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throw new Error('uint16 must have exactly 2 bytes');
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}
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return bytesToInt(bytes);
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};
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uint16.BYTES = 2;
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var uint32 = function (bytes) {
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if (bytes.length !== uint32.BYTES) {
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throw new Error('uint32 must have exactly 4 bytes');
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}
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return bytesToInt(bytes);
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};
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uint32.BYTES = 4;
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var latLng = function (bytes) {
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if (bytes.length !== latLng.BYTES) {
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throw new Error('Lat/Long must have exactly 4 bytes');
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}
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return bytesToInt(bytes) / 1e6;
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};
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latLng.BYTES = 4;
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var uptime = function (bytes) {
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if (bytes.length !== uptime.BYTES) {
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throw new Error('Uptime must have exactly 8 bytes');
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}
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return bytesToInt(bytes);
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};
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uptime.BYTES = 8;
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var hdop = function (bytes) {
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if (bytes.length !== hdop.BYTES) {
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throw new Error('hdop must have exactly 2 bytes');
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}
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return bytesToInt(bytes) / 100;
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};
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hdop.BYTES = 2;
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var altitude = function (bytes) {
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if (bytes.length !== altitude.BYTES) {
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throw new Error('Altitude must have exactly 2 bytes');
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}
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var alt = bytesToInt(bytes) / 4 - 1000;
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return +alt.toFixed(1);
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};
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altitude.BYTES = 2;
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var float = function (bytes) {
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if (bytes.length !== float.BYTES) {
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throw new Error('Float must have exactly 2 bytes');
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}
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var isNegative = bytes[0] & 0x80;
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var b = ('00000000' + Number(bytes[0]).toString(2)).slice(-8)
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+ ('00000000' + Number(bytes[1]).toString(2)).slice(-8);
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if (isNegative) {
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var arr = b.split('').map(function (x) { return !Number(x); });
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for (var i = arr.length - 1; i > 0; i--) {
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arr[i] = !arr[i];
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if (arr[i]) {
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break;
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}
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}
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b = arr.map(Number).join('');
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}
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var t = parseInt(b, 2);
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if (isNegative) {
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t = -t;
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}
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return +(t / 100).toFixed(1);
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};
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float.BYTES = 2;
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var ufloat = function (bytes) {
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if (bytes.length !== ufloat.BYTES) {
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throw new Error('Ufloat must have exactly 2 bytes');
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}
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var h = bytesToInt(bytes);
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return +(h / 100).toFixed(1);
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};
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ufloat.BYTES = 2;
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var pressure = function (bytes) {
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if (bytes.length !== pressure.BYTES) {
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throw new Error('Pressure must have exactly 2 bytes');
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}
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var h = bytesToInt(bytes);
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return +(h / 10).toFixed(1);
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};
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pressure.BYTES = 2;
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var bitmap1 = function (byte) {
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if (byte.length !== bitmap1.BYTES) {
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throw new Error('Bitmap must have exactly 1 byte');
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}
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var i = bytesToInt(byte);
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var bm = ('00000000' + Number(i).toString(2)).substr(-8).split('').map(Number).map(Boolean);
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return ['adr', 'screensaver', 'screen', 'countermode', 'blescan', 'antenna', 'filter', 'alarm']
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.reduce(function (obj, pos, index) {
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obj[pos] = +bm[index];
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return obj;
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}, {});
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};
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bitmap1.BYTES = 1;
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var bitmap2 = function (byte) {
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if (byte.length !== bitmap2.BYTES) {
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throw new Error('Bitmap must have exactly 1 byte');
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}
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var i = bytesToInt(byte);
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var bm = ('00000000' + Number(i).toString(2)).substr(-8).split('').map(Number).map(Boolean);
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return ['gps', 'alarm', 'bme', 'counter', 'sensor1', 'sensor2', 'sensor3', 'battery']
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.reduce(function (obj, pos, index) {
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obj[pos] = +bm[index];
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return obj;
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}, {});
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};
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bitmap2.BYTES = 1;
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var decode = function (bytes, mask, names) {
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var maskLength = mask.reduce(function (prev, cur) {
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return prev + cur.BYTES;
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}, 0);
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if (bytes.length < maskLength) {
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throw new Error('Mask length is ' + maskLength + ' whereas input is ' + bytes.length);
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}
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names = names || [];
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var offset = 0;
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return mask
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.map(function (decodeFn) {
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var current = bytes.slice(offset, offset += decodeFn.BYTES);
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return decodeFn(current);
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})
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.reduce(function (prev, cur, idx) {
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prev[names[idx] || idx] = cur;
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return prev;
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}, {});
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};
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if (typeof module === 'object' && typeof module.exports !== 'undefined') {
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module.exports = {
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uint8: uint8,
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uint16: uint16,
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uint32: uint32,
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uptime: uptime,
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float: float,
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ufloat: ufloat,
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pressure: pressure,
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latLng: latLng,
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hdop: hdop,
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altitude: altitude,
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bitmap1: bitmap1,
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bitmap2: bitmap2,
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version: version,
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decode: decode
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};
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} |