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waveplus.js
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waveplus.js
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const EventEmitter = require('events').EventEmitter;
const struct = require('python-struct');
class WavePlusDevice extends EventEmitter {
constructor (data) {
super();
this.id = data.id;
this.serialNumber = data.serialNumber;
this.address = data.address;
this.connectable = data.connectable;
}
}
class WavePlus extends EventEmitter {
constructor (adapter) {
super();
this.uuid = ['b42e2a68ade711e489d3123b93f75cba'];
this._adapter = adapter;
this._foundDevices = []; // this array will contain registered Wave Plus devices
this._deviceLookup = {};
this._readingLookup = {};
this._readingTimeout = {};
this.sensorData = [];
const registerDevice = device => {
this._foundDevices.push(device);
this._deviceLookup[device.id] = device;
};
this._adapter.on('warning', warning => {
console.error(new Error(warning));
});
this._adapter.on('discover', peripheral => {
let newDevice;
const manufacturerData = peripheral.advertisement ? peripheral.advertisement.manufacturerData : undefined;
if (manufacturerData) {
const deviceInfo = struct.unpack('<HLH', manufacturerData);
if (deviceInfo[0] === 0x0334) {
if (!this._deviceLookup[peripheral.id]) {
newDevice = new WavePlusDevice({
id: peripheral.id,
serialNumber: deviceInfo[1],
address: peripheral.address,
connectable: peripheral.connectable
});
registerDevice(newDevice);
this.emit('found', newDevice);
}
}
}
// Check if it is an advertisement by an already found Wave Plus device, emit "updated" event
const device = this._deviceLookup[peripheral.id];
if (device) {
connect(this, device, peripheral);
}
});
}
}
module.exports = WavePlus;
function connect (wavePlus, device, peripheral) {
if (wavePlus._readingLookup[peripheral.id]) {
return;
}
wavePlus._readingTimeout[peripheral._id] = setTimeout(() => {
if (wavePlus._readingLookup[peripheral._id]) {
disconnect(device, peripheral);
}
}, 60 * 1000);
wavePlus._readingLookup[peripheral.id] = true;
wavePlus._adapter.stop();
peripheral.connect((error) => {
if (error) {
throw new Error(error);
}
const serviceUUIDs = [];
const characteristicUUIDs = wavePlus.uuid;
peripheral.discoverSomeServicesAndCharacteristics(serviceUUIDs, characteristicUUIDs, (error, _services, characteristics) => {
if (error) {
throw new Error(error);
}
characteristics[0].read((error, data) => {
if (error) {
throw new Error(error);
}
const rawData = struct.unpack('BBBBHHHHHHHH', data);
const { rssi } = peripheral;
const humidity = rawData[1] / 2.0;
const radonStAvg = rawData[4];
const radonLtAvg = rawData[5];
const temperature = rawData[6] / 100.0;
const pressure = rawData[7] / 50.0;
const co2 = rawData[8] * 1.0;
const voc = rawData[9] * 1.0;
device.emit('updated', {
rssi,
humidity,
temperature,
pressure,
co2,
voc,
radonLtAvg,
radonStAvg
});
disconnect(wavePlus, peripheral);
});
});
});
}
function disconnect (wavePlus, peripheral) {
peripheral.disconnect(function (error) {
if (error) {
throw new Error(error);
}
clearTimeout(wavePlus._readingTimeout[peripheral._id]);
wavePlus._readingLookup[peripheral.id] = null;
wavePlus._adapter.start();
});
}