ESP32-PaxCounter/src/TTN/packed_decoder.js
2019-04-06 21:10:33 +02:00

261 lines
7.4 KiB
JavaScript

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