continued work on bluez implementation

This commit is contained in:
icanos 2020-01-19 20:08:48 +00:00
parent ff04e8da41
commit 682a181a28

View file

@ -3,11 +3,12 @@ const crypto = require('crypto');
const xor = require('buffer-xor'); const xor = require('buffer-xor');
const _ = require('lodash'); const _ = require('lodash');
const EventEmitter = require('events'); const EventEmitter = require('events');
const sleep = require('sleep');
let debug = ''; let debug = 'console';
const getLogger = () => { const getLogger = () => {
const consoleLogger = msg => console.log('plejd', msg); const consoleLogger = msg => console.log('plejd-ble', msg);
if (debug === 'console') { if (debug === 'console') {
return consoleLogger; return consoleLogger;
} }
@ -19,11 +20,11 @@ const getLogger = () => {
const logger = getLogger(); const logger = getLogger();
// UUIDs // UUIDs
const PLEJD_SERVICE = "31ba000160854726be45040c957391b5" const PLEJD_SERVICE = '31ba0001-6085-4726-be45-040c957391b5';
const DATA_UUID = "31ba000460854726be45040c957391b5" const DATA_UUID = '31ba0004-6085-4726-be45-040c957391b5';
const LAST_DATA_UUID = "31ba000560854726be45040c957391b5" const LAST_DATA_UUID = '31ba0005-6085-4726-be45-040c957391b5';
const AUTH_UUID = "31ba000960854726be45040c957391b5" const AUTH_UUID = '31ba0009-6085-4726-be45-040c957391b5';
const PING_UUID = "31ba000a60854726be45040c957391b5" const PING_UUID = '31ba000a-6085-4726-be45-040c957391b5';
const STATE_IDLE = 'idle'; const STATE_IDLE = 'idle';
const STATE_SCANNING = 'scanning'; const STATE_SCANNING = 'scanning';
@ -56,15 +57,10 @@ class PlejdService extends EventEmitter {
// Keeps track of the current state // Keeps track of the current state
this.state = STATE_IDLE; this.state = STATE_IDLE;
// Keeps track of discovered devices
this.devices = {};
// Keeps track of the currently connected device
this.device = null;
this.deviceAddress = null;
this.deviceIdx = 0;
this.writeQueue = []; this.writeQueue = [];
this.plejdService = null;
this.bleDevices = [];
this.plejdDevices = {}; this.plejdDevices = {};
this.connectEventHooked = false; this.connectEventHooked = false;
@ -72,11 +68,13 @@ class PlejdService extends EventEmitter {
this.characteristics = { this.characteristics = {
data: null, data: null,
lastData: null, lastData: null,
lastDataProperties: null,
auth: null, auth: null,
ping: null ping: null
}; };
this.bus = dbus.systemBus(); this.bus = dbus.systemBus();
this.adapter = null;
logger('wiring events and waiting for BLE interface to power up.'); logger('wiring events and waiting for BLE interface to power up.');
this.wireEvents(); this.wireEvents();
@ -90,70 +88,126 @@ class PlejdService extends EventEmitter {
const bluez = await this.bus.getProxyObject(BLUEZ_SERVICE_NAME, '/'); const bluez = await this.bus.getProxyObject(BLUEZ_SERVICE_NAME, '/');
this.objectManager = await bluez.getInterface(DBUS_OM_INTERFACE); this.objectManager = await bluez.getInterface(DBUS_OM_INTERFACE);
let objs = await this.objectManager.GetManagedObjects(); // We need to find the ble interface which implements the Adapter1 interface
console.log(objs); const managedObjects = await this.objectManager.GetManagedObjects();
let result = await this._getInterface(managedObjects, BLUEZ_ADAPTER_ID);
if (result) {
this.adapter = result[1];
}
if (!this.adapter) {
console.log('plejd-ble: error: unable to find a bluetooth adapter that is compatible.');
return;
}
for (let path of Object.keys(managedObjects)) {
const interfaces = Object.keys(managedObjects[path]);
if (interfaces.indexOf(BLUEZ_DEVICE_ID) > -1) {
const proxyObject = await this.bus.getProxyObject(BLUEZ_SERVICE_NAME, path);
const device = await proxyObject.getInterface(BLUEZ_DEVICE_ID);
const connected = managedObjects[path][BLUEZ_DEVICE_ID].Connected.value;
if (connected) {
console.log('plejd-ble: disconnecting ' + path);
await device.Disconnect();
}
await this.adapter.RemoveDevice(path);
}
}
this.objectManager.on('InterfacesAdded', this.onInterfacesAdded.bind(this));
this.objectManager.on('InterfacesRemoved', this.onInterfacesRemoved.bind(this));
this.adapter.SetDiscoveryFilter({
'UUIDs': new dbus.Variant('as', [PLEJD_SERVICE]),
'Transport': new dbus.Variant('s', 'le')
});
await this.adapter.StartDiscovery();
setTimeout(async () => {
await this._internalInit();
}, 2000);
}
async _internalInit() {
console.log('plejd-ble: got ' + this.bleDevices.length + ' device(s).');
for (const plejd of this.bleDevices) {
console.log('inspecting ' + plejd['path']);
try {
const proxyObject = await this.bus.getProxyObject(BLUEZ_SERVICE_NAME, plejd['path']);
const device = await proxyObject.getInterface(BLUEZ_DEVICE_ID);
const properties = await proxyObject.getInterface(DBUS_PROP_INTERFACE);
plejd['rssi'] = (await properties.Get(BLUEZ_DEVICE_ID, 'RSSI')).value;
plejd['instance'] = device;
console.log('plejd-ble: discovered ' + plejd['path'] + ' with rssi ' + plejd['rssi']);
}
catch (err) {
console.log('plejd-ble: failed inspecting ' + plejd['path'] + ' error: ' + err);
}
}
const sortedDevices = this.bleDevices.sort((a, b) => b['rssi'] - a['rssi']);
let connectedDevice = null;
for (const plejd of sortedDevices) {
try {
logger('connecting to ' + plejd['path']);
await plejd['instance'].Connect();
connectedDevice = plejd;
break
}
catch (err) {
console.log('plejd-ble: failed connecting to plejd, error: ' + err);
}
}
setTimeout(async () => {
await this.onDeviceConnected(connectedDevice);
await this.adapter.StopDiscovery();
}, 2000);
}
async _getInterface(managedObjects, iface) {
const managedPaths = Object.keys(managedObjects);
for (let path of managedPaths) {
const pathInterfaces = Object.keys(managedObjects[path]);
if (pathInterfaces.indexOf(iface) > -1) {
console.log('plejd-ble: found ble interface \'' + iface + '\' at ' + path);
try {
const adapterObject = await this.bus.getProxyObject(BLUEZ_SERVICE_NAME, path);
return [path, adapterObject.getInterface(iface), adapterObject];
}
catch (err) {
console.log('plejd-ble: error: failed to get interface \'' + iface + '\': ' + err);
}
}
}
return null;
} }
async onInterfacesAdded(path, interfaces) { async onInterfacesAdded(path, interfaces) {
const [adapter, dev, service, characteristic] = path.split('/').slice(3); const [adapter, dev, service, characteristic] = path.split('/').slice(3);
const interfaceKeys = Object.keys(interfaces);
if ('org.bluez.Adapter1' in interfaces) { if (interfaceKeys.indexOf(BLUEZ_DEVICE_ID) > -1) {
console.log('has org.bluez.Adapter1'); if (interfaces[BLUEZ_DEVICE_ID]['UUIDs'].value.indexOf(PLEJD_SERVICE) > -1) {
console.log('found ' + path);
const props = interfaces['org.bluez.Adapter1']; this.bleDevices.push({ 'path': path });
console.log(props); } else {
this.adapter_props = props; console.log('uh oh, no Plejd device.');
}
if ('org.bluez.Device1' in interfaces) {
console.log('has org.bluez.Device1');
const props = interfaces['org.bluez.Device1'];
console.log(props);
this.devices[props.Address] = path;
this.emit('device', props.Address, props);
}
if ('org.bluez.GattService1' in interfaces) {
console.log('has org.bluez.GattService1');
const props = interfaces['org.bluez.GattService1'];
console.log(props);
const iface = await this.getInterface('org.bluez', path, 'org.bluez.GattService1');
const service = new Service(iface);
const dev = await this.getDevice(props.Device);
if (this._path[path]) {
// Characteristic was registered before service, copy them over
service.characteristics = this._path[path].characteristics || {};
} }
dev.services[props.UUID] = service;
this._path[path] = service;
}
if ('org.bluez.GattCharacteristic1' in interfaces) {
console.log('has org.bluez.GattCharacteristic1');
const props = interfaces['org.bluez.GattCharacteristic1'];
console.log(props);
const iface = await this.getInterface('org.bluez', path, 'org.bluez.GattCharacteristic1');
const changed = await this.getInterface('org.bluez', path, 'org.freedesktop.DBus.Properties');
const characteristic = new Characteristic(iface, changed);
if (this._path[path]) {
// Descriptor was registered before characteristic, copy them over
characteristic.descriptors = this._path[path].descriptors || {};
}
if (!this._path[props.Service]) {
// service not jet created
this._path[props.Service] = { characteristics: {} };
}
this._path[props.Service].characteristics[props.UUID] = characteristic;
this._path[path] = characteristic;
} }
} }
@ -252,186 +306,45 @@ class PlejdService extends EventEmitter {
this.write(payload); this.write(payload);
} }
scan() {
console.log('scan()');
if (this.state === STATE_SCANNING) {
console.log('error: already scanning, please wait.');
return;
}
// this.state = STATE_SCANNING;
// noble.startScanning([PLEJD_SERVICE]);
// setTimeout(() => {
// noble.stopScanning();
// this.state = STATE_IDLE;
// const foundDeviceCount = Object.values(this.devices).length;
// console.log('scan completed, found ' + foundDeviceCount + ' device(s).');
// if (foundDeviceCount == 0) {
// console.log('warning: no devices found. will not do anything else.');
// }
// else {
// this.emit('scanComplete', this.devices);
// }
// }, 5000);
}
connect(uuid = null) {
const self = this;
if (this.state === STATE_CONNECTING) {
console.log('warning: currently connecting to a device, please wait...');
return;
}
// if (!uuid) {
// this.device = Object.values(this.devices)[this.deviceIdx];
// }
// else {
// this.device = this.devices[uuid];
// if (!this.device) {
// console.log('error: could not find a device with uuid: ' + uuid);
// return;
// }
// }
// if (!this.device) {
// console.log('error: reached end of device list. cannot continue.');
// return;
// }
// this.deviceAddress = this._reverseBuffer(
// Buffer.from(
// String(this.device.address)
// .replace(/\-/g, '')
// .replace(/\:/g, ''), 'hex'
// )
// );
// console.log('connecting to ' + this.device.id + ' with addr ' + this.device.address + ' and rssi ' + this.device.rssi);
// setTimeout(() => {
// if (self.state !== STATE_CONNECTED && self.state !== STATE_AUTHENTICATED) {
// if (self.deviceIdx < Object.keys(self.devices).length) {
// logger('connection timed out after 10 s. cleaning up and trying next.');
// self.disconnect();
// self.deviceIdx++;
// self.connect();
// }
// }
// }, 10 * 1000);
// this.state = STATE_CONNECTING;
// if (!this.connectEventHooked) {
// this.device.once('connect', (state) => {
// self.onDeviceConnected(state);
// this.connectEventHooked = false;
// });
// this.connectEventHooked = true;
// }
// this.device.connect();
}
disconnect() { disconnect() {
console.log('disconnect()'); console.log('disconnect()');
clearInterval(this.pingRef); clearInterval(this.pingRef);
// if (this.device) {
// this.device.removeAllListeners('servicesDiscover');
// this.device.removeAllListeners('connect');
// this.device.removeAllListeners('disconnect');
// }
// if (this.characteristics.auth) {
// this.characteristics.auth.removeAllListeners('read');
// this.characteristics.auth.removeAllListeners('write');
// }
// if (this.characteristics.data) {
// this.characteristics.data.removeAllListeners('read');
// this.characteristics.data.removeAllListeners('write');
// }
// if (this.characteristics.lastData) {
// this.characteristics.lastData.removeAllListeners('read');
// this.characteristics.lastData.removeAllListeners('write');
// }
// if (this.characteristics.ping) {
// this.characteristics.ping.removeAllListeners('read');
// this.characteristics.ping.removeAllListeners('write');
// }
this.connectEventHooked = false;
// this.unsubscribeCharacteristics();
// this.device.disconnect();
this.state = STATE_DISCONNECTED;
} }
authenticate() { async authenticate() {
console.log('authenticate()'); console.log('authenticate()');
const self = this; const self = this;
if (this.state !== STATE_CONNECTED) { try {
console.log('error: need to be connected and not previously authenticated (new connection).'); console.log('sending challenge');
return; await this.characteristics.auth.WriteValue([0], {});
console.log('reading response');
const challenge = await this.characteristics.auth.ReadValue({});
const response = this._createChallengeResponse(this.cryptoKey, challenge);
await this.characteristics.auth.WriteValue([...response], {});
this.emit('authenticated');
}
catch (err) {
console.log('plejd-ble: error: failed to authenticate: ' + err);
} }
// this.characteristics.auth.write(Buffer.from([0]), false, (err) => {
// if (err) {
// console.log('error: failed to authenticate: ' + err);
// return;
// }
// self.characteristics.auth.read((err, data) => {
// if (err) {
// console.log('error: failed to read auth response: ' + err);
// return;
// }
// var resp = self._createChallengeResponse(self.cryptoKey, data);
// self.characteristics.auth.write(resp, false, (err) => {
// if (err) {
// console.log('error: failed to challenge: ' + err);
// return;
// }
// self.state = STATE_AUTHENTICATED;
// self.emit('authenticated');
// });
// })
// });
} }
write(data) { async write(data, retry = true) {
if (this.state !== STATE_AUTHENTICATED) { try {
logger('error: not connected.'); const encryptedData = this._encryptDecrypt(this.cryptoKey, this.plejdService.addr, data);
this.writeQueue.push(data); await this.characteristics.data.WriteValue([...encryptedData], {});
return false;
} }
catch (err) {
console.log('plejd-ble: write failed ' + err);
await this.init();
// try { if (retry) {
// const encryptedData = this._encryptDecrypt(this.cryptoKey, this.deviceAddress, data); await this.write(data, false);
// this.characteristics.data.write(encryptedData, false); }
}
// let writeData;
// while ((writeData = this.writeQueue.shift()) !== undefined) {
// this.characteristics.data.write(this._encryptDecrypt(this.cryptoKey, this.deviceAddress, writeData), false);
// }
// }
// catch (error) {
// console.log('error: writing to plejd: ' + error);
// console.log('will reconnect and try again.');
// this.writeQueue.push(data);
// this.disconnect();
// this.connect();
// }
} }
onAuthenticated() { onAuthenticated() {
@ -440,21 +353,13 @@ class PlejdService extends EventEmitter {
this.startPing(); this.startPing();
} }
startPing() { async startPing() {
console.log('startPing()'); console.log('startPing()');
clearInterval(this.pingRef); clearInterval(this.pingRef);
this.pingRef = setInterval(async () => { this.pingRef = setInterval(async () => {
if (this.state === STATE_AUTHENTICATED) { logger('ping');
logger('ping'); await this.ping();
this.ping();
}
else if (this.state === STATE_DISCONNECTED) {
console.log('warning: device disconnected, stop ping.');
}
else {
console.log('error: ping failed, not connected.');
}
}, 3000); }, 3000);
} }
@ -462,184 +367,144 @@ class PlejdService extends EventEmitter {
logger('pong: ' + nr); logger('pong: ' + nr);
} }
onPingFailed(error) { async onPingFailed(error) {
logger('onPingFailed(' + error + ')'); logger('onPingFailed(' + error + ')');
console.log('plejd-ble: ping failed, reconnecting.');
logger('ping failed, reconnecting.'); clearInterval(this.pingRef);
this.disconnect(); await this.init();
this.connect();
// clearInterval(this.pingRef);
// this.unsubscribeCharacteristics();
// this.state = STATE_DISCONNECTED;
// this.characteristicState = STATE_UNINITIALIZED;
// this.connect(this.device.id);
} }
ping() { async ping() {
logger('ping()'); logger('ping()');
if (this.state !== STATE_AUTHENTICATED) { var ping = crypto.randomBytes(1);
console.log('error: needs to be authenticated before pinging.'); let pong = null;
try {
await this.characteristics.ping.WriteValue([...ping], {});
pong = await this.characteristics.ping.ReadValue({});
}
catch (err) {
console.log('error: writing to plejd: ' + err);
this.emit('pingFailed', 'write error');
return; return;
} }
const self = this; if (((ping[0] + 1) & 0xff) !== pong[0]) {
var ping = crypto.randomBytes(1); console.log('error: plejd ping failed');
this.emit('pingFailed', 'plejd ping failed ' + ping[0] + ' - ' + pong[0]);
return;
}
// try { this.emit('pingSuccess', pong[0]);
// this.characteristics.ping.write(ping, false, (err) => {
// if (err) {
// console.log('error: unable to send ping: ' + err);
// self.emit('pingFailed');
// return;
// }
// this.characteristics.ping.read((err, data) => {
// if (err) {
// console.log('error: unable to read ping: ' + err);
// self.emit('pingFailed');
// return;
// }
// if (((ping[0] + 1) & 0xff) !== data[0]) {
// self.emit('pingFailed');
// return;
// }
// else {
// self.emit('pingSuccess', data[0]);
// }
// });
// });
// }
// catch (error) {
// console.log('error: writing to plejd: ' + error);
// self.emit('pingFailed', error);
// }
} }
onDeviceConnected(err) { async _processPlejdService(path, characteristics) {
const proxyObject = await this.bus.getProxyObject(BLUEZ_SERVICE_NAME, path);
const service = await proxyObject.getInterface(GATT_SERVICE_ID);
const properties = await proxyObject.getInterface(DBUS_PROP_INTERFACE);
const uuid = (await properties.Get(GATT_SERVICE_ID, 'UUID')).value;
if (uuid !== PLEJD_SERVICE) {
console.log('plejd-ble: not a Plejd device.');
return null;
}
const dev = (await properties.Get(GATT_SERVICE_ID, 'Device')).value;
const regex = /dev_([0-9A-F_]+)$/;
const dirtyAddr = regex.exec(dev);
const addr = this._reverseBuffer(
Buffer.from(
String(dirtyAddr[1])
.replace(/\-/g, '')
.replace(/\:/g, ''), 'hex'
)
);
for (const chPath of characteristics) {
const chProxyObject = await this.bus.getProxyObject(BLUEZ_SERVICE_NAME, chPath);
const ch = await chProxyObject.getInterface(GATT_CHRC_ID);
const prop = await chProxyObject.getInterface(DBUS_PROP_INTERFACE);
const chUuid = (await prop.Get(GATT_CHRC_ID, 'UUID')).value;
if (chUuid === DATA_UUID) {
logger('found DATA characteristic.');
this.characteristics.data = ch;
}
else if (chUuid === LAST_DATA_UUID) {
logger('found LAST_DATA characteristic.');
this.characteristics.lastData = ch;
this.characteristics.lastDataProperties = prop;
}
else if (chUuid === AUTH_UUID) {
logger('found AUTH characteristic.');
this.characteristics.auth = ch;
}
else if (chUuid === PING_UUID) {
logger('found PING characteristic.');
this.characteristics.ping = ch;
}
}
return {
addr: [...addr]
};
}
async onDeviceConnected(device) {
console.log('onDeviceConnected()'); console.log('onDeviceConnected()');
const self = this;
// if (err) { const objects = await this.objectManager.GetManagedObjects();
// console.log('error: failed to connect to device: ' + err + '. picking next.'); let characteristics = [];
// this.deviceIdx++;
// this.disconnect();
// this.connect();
// return;
// }
// this.state = STATE_CONNECTED; console.log(objects);
// if (this.characteristicState === STATE_UNINITIALIZED) { for (const path of Object.keys(objects)) {
// // We need to discover the characteristics const interfaces = Object.keys(objects[path]);
// logger('discovering services and characteristics'); if (interfaces.indexOf(GATT_CHRC_ID) > -1) {
characteristics.push(path);
}
}
// setTimeout(() => { for (const path of Object.keys(objects)) {
// if (this.characteristicState === STATE_UNINITIALIZED) { const interfaces = Object.keys(objects[path]);
// console.log('error: discovering characteristics timed out. trying next device.'); console.log(interfaces);
// self.deviceIdx++; if (interfaces.indexOf(GATT_SERVICE_ID) > -1) {
// self.disconnect(); let chPaths = [];
// self.connect(); for (const c of characteristics) {
// } if (c[0] === '/') {
// }, 5000); chPaths.push(c);
}
}
// this.device.discoverSomeServicesAndCharacteristics([PLEJD_SERVICE], [], async (err, services, characteristics) => { console.log('trying ' + chPaths.length + ' characteristics');
// if (err) {
// console.log('error: failed to discover services: ' + err);
// return;
// }
// if (self.state !== STATE_CONNECTED || self.characteristicState !== STATE_UNINITIALIZED) { this.plejdService = await this._processPlejdService(path, chPaths);
// // in case our time out triggered before we got here. if (this.plejdService) {
// console.log('warning: found characteristics in invalid state. ignoring.'); break;
// return; }
// } }
}
// logger('found ' + characteristics.length + ' characteristic(s).'); console.log(this.plejdService);
// characteristics.forEach((ch) => { if (!this.plejdService) {
// if (DATA_UUID == ch.uuid) { console.log('plejd-ble: error: unable to connect to the Plejd mesh.');
// logger('found DATA characteristic.'); return;
// self.characteristics.data = ch; }
// }
// else if (LAST_DATA_UUID == ch.uuid) {
// logger('found LAST_DATA characteristic.');
// self.characteristics.lastData = ch;
// }
// else if (AUTH_UUID == ch.uuid) {
// logger('found AUTH characteristic.');
// self.characteristics.auth = ch;
// }
// else if (PING_UUID == ch.uuid) {
// logger('found PING characteristic.');
// self.characteristics.ping = ch;
// }
// });
// if (self.characteristics.data this.emit('deviceCharacteristicsComplete');
// && self.characteristics.lastData
// && self.characteristics.auth
// && self.characteristics.ping) {
// self.characteristicState = STATE_INITIALIZED;
// // subscribe to notifications
// this.subscribeCharacteristics();
// self.emit('deviceCharacteristicsComplete', self.device);
// }
// });
// }
} }
onDeviceCharacteristicsComplete(device) { onDeviceCharacteristicsComplete() {
logger('onDeviceCharacteristicsComplete(' + device.id + ')'); logger('onDeviceCharacteristicsComplete()');
this.authenticate(); this.authenticate();
} }
onDeviceDiscovered(device) {
logger('onDeviceDiscovered(' + device.id + ')');
if (device.advertisement.localName === 'P mesh') {
logger('device is P mesh');
this.devices[device.id] = device;
}
}
onDeviceDisconnected() {
logger('onDeviceDisconnected()');
this.disconnect();
if (!this.device) {
console.log('warning: reconnect will not be performed.');
return;
}
// we just want to reconnect
// this.connect(this.device.id);
}
onDeviceScanComplete() {
console.log('onDeviceScanComplete()');
console.log('trying to connect to the mesh network.');
this.connect();
}
// onInterfaceStateChanged(state) {
// console.log('onInterfaceStateChanged(' + state + ')');
// if (state === 'poweredOn') {
// this.scan();
// }
// else {
// noble.stopScanning();
// }
// }
onLastDataUpdated(data, isNotification) { onLastDataUpdated(data, isNotification) {
const decoded = this._encryptDecrypt(this.cryptoKey, this.deviceAddress, data); const decoded = this._encryptDecrypt(this.cryptoKey, this.plejdService.addr, data);
let state = 0; let state = 0;
let dim = 0; let dim = 0;
@ -684,43 +549,12 @@ class PlejdService extends EventEmitter {
console.log('wireEvents()'); console.log('wireEvents()');
const self = this; const self = this;
// noble.on('stateChange', this.onInterfaceStateChanged.bind(self));
// noble.on('discover', this.onDeviceDiscovered.bind(self));
// noble.on('disconnect', this.onDeviceDisconnected.bind(self));
this.on('scanComplete', this.onDeviceScanComplete.bind(this));
this.on('deviceCharacteristicsComplete', this.onDeviceCharacteristicsComplete.bind(self)); this.on('deviceCharacteristicsComplete', this.onDeviceCharacteristicsComplete.bind(self));
this.on('authenticated', this.onAuthenticated.bind(self)); this.on('authenticated', this.onAuthenticated.bind(self));
this.on('pingFailed', this.onPingFailed.bind(self)); this.on('pingFailed', this.onPingFailed.bind(self));
this.on('pingSuccess', this.onPingSuccess.bind(self)); this.on('pingSuccess', this.onPingSuccess.bind(self));
} }
subscribeCharacteristics() {
// if (this.characteristics.lastData) {
// this.characteristics.lastData.subscribe((err) => {
// if (err) {
// console.log('error: could not subscribe to event.');
// }
// });
// this.characteristics.lastData.on('data', this.onLastDataUpdated.bind(this));
// }
}
unsubscribeCharacteristics() {
// if (this.characteristics.lastData) {
// try {
// this.characteristics.lastData.unsubscribe((err) => {
// if (err) {
// console.log('error: could not unsubscribe from event.');
// }
// });
// }
// catch (error) {
// console.log('warning: could not unsubscribe from lastData, probably already disconnected: ' + error);
// }
// }
}
_createChallengeResponse(key, challenge) { _createChallengeResponse(key, challenge) {
const intermediate = crypto.createHash('sha256').update(xor(key, challenge)).digest(); const intermediate = crypto.createHash('sha256').update(xor(key, challenge)).digest();
const part1 = intermediate.subarray(0, 16); const part1 = intermediate.subarray(0, 16);