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1080 lines (899 loc) · 33.3 KB
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require('env2')('config.env');
var events = require('events');
var debug = require('debug')('ws-slave');
var WebSocket = require('ws');
var async = require('async');
var util = require('util');
var colors = require('colors');
var noble = require('./lib/noble');
var utils = require('./lib/utils');
var port = 0xB1e;
var ws;
var wss;
var peripherals = {};
var servicesCache=[];
var localMacAddress='';
var targetPeripheralId='';
var keepTargetConnected=false;
var initialized=false;
var connected=false;
var isClientConnected=false;
var eventEmitter = new events.EventEmitter();
console.log('GATTacker ws-slave');
wss = new WebSocket.Server({
port: port,
perMessageDeflate: false
});
wss.on('connection', function(ws_) {
console.log('ws -> connection');
ws = ws_;
sendEvent({
type: 'stateChange',
state: noble.state
});
ws.on('message', onMessage);
ws.on('close', function() {
console.log('ws -> close');
//stop keeping connection to target device
if (targetPeripheralId) {
deinitialize(targetPeripheralId, function(peripheralId){
debug('deinitialized: ' + peripheralId);
});
}
noble.stopScanning();
});
});
//handle raw notifications
noble._bindings.on('handleNotify', onRawNotify);
function sendEvent(event) {
var message = JSON.stringify(event);
console.log('ws -> send: '.blue + message);
var clients = wss.clients;
for (var i = 0; i < clients.length; i++) {
clients[i].send(message);
}
}
noble.on('scanStop', function(){
sendEvent({
type: "stopScanning"
})
});
noble.on('scanStart', function(){
sendEvent({
type: "startScanning"
})
});
//check local MAC address
noble._bindings._hci.on('addressChange', function(address){
debug('Local MAC: ' + address);
localMacAddress = address;
})
var {
console.log('ws -> message: '.green + message);
var command = JSON.parse(message);
var action = command.action;
var peripheralId = command.peripheralId;
var serviceUuids = command.serviceUuids;
var serviceUuid = command.serviceUuid;
var characteristicUuids = command.characteristicUuids;
var characteristicUuid = command.characteristicUuid;
var data = command.data ? new Buffer(command.data, 'hex') : null;
var withoutResponse = command.withoutResponse;
var broadcast = command.broadcast;
var notify = command.notify;
var descriptorUuid = command.descriptorUuid;
var handle = handle;
var peripheral = peripherals[peripheralId];
var service = null;
var characteristic = null;
var descriptor = null;
if (peripheral && serviceUuid) {
var service = servicesCache[peripheralId].services[serviceUuid];
if (!service) {
debug('service not found!'.red);
} else {
var characteristic = servicesCache[peripheralId].services[serviceUuid].characteristics[characteristicUuid];
if (!characteristic) {
debug('-- Characteristic not found : '.red + characteristicUuid + '\nservice object:\n\n' + util.inspect( service, {showHidden: false, depth: 2, colorize: true}));
}
}
}
if (action === 'read') {
readRaw(peripheralId, serviceUuid, characteristicUuid)
} else if (action === 'write') {
writeRaw(peripheralId, serviceUuid, characteristicUuid, data, withoutResponse);
} else if (action === 'notify') {
subscribeRaw(peripheralId, serviceUuid, characteristicUuid, notify);
} else if (action === 'explore') {
explore(peripheralId, command.readValues);
} else if (action === 'initialize'){
if (command.servicesJsonData) {
initialize(peripheralId, command.servicesJsonData, command.keepConnected);
} else {
initializeWithoutServices(peripheralId);
}
} else if (action === 'clientConnection') {
clientConnection(command.clientAddress, command.state);
} else if (action === 'macAddress') {
sendEvent({
type: 'macAddress',
macAddress: localMacAddress
});
} else if (action === 'startScanning') {
noble.startScanning(serviceUuids, command.allowDuplicates);
} else if (action === 'stopScanning') {
noble.stopScanning();
} else if (action === 'connect') {
peripheral.connect();
} else if (action === 'disconnect') {
peripheral.disconnect();
} else if (action === 'updateRssi') {
peripheral.updateRssi();
} else if (action === 'discoverServices') {
peripheral.discoverServices(command.uuids);
} else if (action === 'discoverIncludedServices') {
service.discoverIncludedServices(serviceUuids);
} else if (action === 'discoverCharacteristics') {
service.discoverCharacteristics(characteristicUuids);
} else if (action === 'broadcast') {
characteristic.broadcast(broadcast);
} else if (action === 'discoverDescriptors') {
characteristic.discoverDescriptors();
} else if (action === 'readValue') {
descriptor.readValue();
} else if (action === 'writeValue') {
descriptor.writeValue(data);
} else if (action === 'readHandle') {
peripheral.readHandle(handle);
} else if (action === 'writeHandle') {
peripheral.writeHandle(handle, data, withoutResponse);
}
};
function initializeWithoutServices(peripheralId) {
//was previously initialized for other device
if (targetPeripheralId && targetPeripheralId != peripheralId) {
deinitialize(targetPeripheralId, function(){
console.log('re-initialize for other device ');
})
}
targetPeripheralId = peripheralId;
sendEvent({
type: 'initializeStatus',
peripheralId: peripheralId,
status: 'about to explore services'
})
explore(peripheralId, false, function(servicesJson){
//give it a second to settle for reconnect after exploring, otherwise "unknown connection identifier"
setTimeout(function() {
peripherals[peripheralId].connect(function(error){
if (error) {
debug('Connect error! '.red + error)
sendEvent({
type: 'initializeStatus',
peripheralId: peripheralId,
status: 'connect error' + error
})
} else {
sendEvent({
type: 'initialized',
peripheralId: peripheralId
})
}
})
}, 1000);
})
}
function initialize(peripheralId, servicesJson, keepConnected) {
debug('Initialize JSON services for ' + peripheralId)
sendEvent({
type: 'initializeStatus',
peripheralId: peripheralId,
status: 'JSON services received'
})
//was previously initialized for other device
if (targetPeripheralId && targetPeripheralId != peripheralId) {
deinitialize(targetPeripheralId, function(){
console.log('re-initialize for other device ');
})
}
keepTargetConnected=keepConnected;
targetPeripheralId = peripheralId;
if (!servicesCache[peripheralId]) {
servicesCache[peripheralId] = {
services : [],
handles : []
}
}
//parse JSON to servicesCache array, indexed by uuids
for (sindex = 0; sindex < servicesJson.length; ++sindex) {
service = servicesJson[sindex];
if (!servicesCache[peripheralId].services[service.uuid]) {
servicesCache[peripheralId].services[service.uuid] = { characteristics : []};
}
debug("Setting up service: " + service.uuid);
for (cindex = 0; cindex<service.characteristics.length; ++cindex) {
characteristic = service.characteristics[cindex];
debug(" Setting up Characteristic: " + characteristic.uuid);
debug(" Handle: " + characteristic.valueHandle);
debug(" Properties: " + characteristic.properties);
servicesCache[peripheralId].services[service.uuid].characteristics[characteristic.uuid]= {
handle: characteristic.valueHandle,
properties : characteristic.properties,
descriptors : []
};
//store handle association for quick raw notifications lookup
servicesCache[peripheralId].handles[characteristic.valueHandle] = {
serviceUuid : service.uuid,
uuid : characteristic.uuid
}
if (characteristic.descriptors.length > 0) {
debug(" Descriptors: ");
for (dindex = 0; dindex < characteristic.descriptors.length; ++dindex) {
descriptor = characteristic.descriptors[dindex];
debug(" " + descriptor.uuid + ' handle ' + descriptor.handle)
servicesCache[peripheralId].services[service.uuid].characteristics[characteristic.uuid].descriptors[descriptor.uuid]=descriptor.handle;
}
}
}
}
if (!peripherals[peripheralId]) {
debug('Peripheral not yet discovered, start scanning...')
sendEvent({
type: 'initializeStatus',
peripheralId: peripheralId,
status: 'start scanning for target peripheral'
})
noble.startScanning();
eventEmitter.once('targetDiscovered', function(){
noble.stopScanning();
sendEvent({
type: 'initializeStatus',
peripheralId: peripheralId,
status: 'target peripheral discovered, trying to connect...'
})
//connect to target peripheral
peripherals[peripheralId].connect(function(error){
if (error) {
sendEvent({
type: 'initializeStatus',
peripheralId: peripheralId,
status: 'connect error'
});
} else {
sendEvent({
type: 'initialized',
peripheralId: peripheralId
});
}
})
})
} else { //previously discovered
sendEvent({
type: 'initializeStatus',
peripheralId: peripheralId,
status: 'target peripheral previously discovered, trying to connect...'
})
//connect to target peripheral
peripherals[peripheralId].connect(function(error){
if (error) {
sendEvent({
type: 'initializeStatus',
peripheralId: peripheralId,
status: 'connect error'
});
} else {
sendEvent({
type: 'initialized',
peripheralId: peripheralId
});
}
})
}
}
//read by handle
function readRaw(peripheralId, serviceUuid, uuid, callback){
//todo catch exceptions
var handle = servicesCache[peripheralId].services[serviceUuid].characteristics[uuid].handle;
var peripheral = peripherals[peripheralId];
//if not connected, connect
checkConnected(peripheral, function(){
peripheral.readHandle(handle, function(error, data){
if (error) {
debug('readHandle error : '.red + error)
}
debug('read handle data :' + data.toString('hex'));
sendEvent({
type: 'read',
peripheralId: peripheralId,
serviceUuid: serviceUuid,
characteristicUuid: uuid,
data: data.toString('hex'),
isNotification: false
});
if (callback) { callback(error, data); }
});
})
}
//write by handle
function writeRaw(peripheralId, serviceUuid, uuid, data, withoutResponse, callback){
//todo catch exceptions
var handle = servicesCache[peripheralId].services[serviceUuid].characteristics[uuid].handle;
var peripheral = peripherals[peripheralId];
//if not connected, connect
checkConnected(peripheral, function(){
peripheral.writeHandle(handle, new Buffer(data,'hex'), withoutResponse, function(error){
if (error) {
debug('Write handle error! '. red + error);
}
debug('write handle sent ' + peripheralId + ' : ' + serviceUuid + ' : ' + uuid )
sendEvent({
type: 'write',
peripheralId: peripheralId,
serviceUuid: serviceUuid,
characteristicUuid: uuid
});
});
})
}
//raw subscription to indication/notification
function subscribeRaw(peripheralId, serviceUuid, uuid, state, callback) {
//todo catch exceptions
var peripheral = peripherals[peripheralId];
var characteristic = servicesCache[peripheralId].services[serviceUuid].characteristics[uuid];
var handle = characteristic.descriptors['2902'];
if (state == false) {
value = '0000';
} else {
if (characteristic.properties == 'indicate'){
value = '0200';
} else {// notify
value = '0100';
}
}
//if not connected, connect
checkConnected(peripheral, function(){
peripheral.writeHandle(handle, new Buffer(value, 'hex'), false, function(error){
if (error){
debug('Subscribe error '.red + peripheralId + ' : ' + serviceUuid + ' : ' + uuid )
}
sendEvent({
type: 'notify',
peripheralId: peripheralId,
serviceUuid: serviceUuid,
characteristicUuid: uuid,
state: state
});
});
})
checkRawNotificationListeners();
}
//Debug
function checkRawNotificationListeners() {
listenersCount=noble._bindings.listeners('handleNotify').length;
// debug('Raw notification listeners: ' + util.inspect(noble._bindings.listeners('handleNotify')));
if (!listenersCount) {
noble._bindings.on('handleNotify', onRawNotify);
}
}
function onRawNotify(peripheralId, handle, data){
//todo catch exceptions
var serviceUuid = servicesCache[peripheralId].handles[handle].serviceUuid;
var uuid = servicesCache[peripheralId].handles[handle].uuid;
debug('Raw notify: ' + peripheralId + ' : ' + handle + ' : ' + data.toString('hex'));
sendEvent({
type: 'read',
peripheralId: peripheralId,
serviceUuid: serviceUuid,
characteristicUuid: uuid,
data: data.toString('hex'),
isNotification: true
});
}
function deinitialize(peripheralId, callback){
targetPeripheralId='';
initialized=false;
if (peripherals[peripheralId]) {
if (peripherals[peripheralId].connected) {
debug('disconnecting peripheral');
peripherals[peripheralId].disconnect();
}
}
if (callback) {
callback(peripheralId);
}
}
function clientConnection(clientAddress, state) {
var dis = '';
if (state != true) {
dis='dis';
}
console.log('client ' + dis + 'connected : ' + clientAddress);
isClientConnected = state;
// send confirmation event for reconnect
eventEmitter.emit('clientConnection', clientAddress, state);
}
//check whether connected to peripheral, if not - reconnect, and then invoke peripheral function
function checkConnected(peripheral, callback){
if (peripheral.state === 'connected') {
debug(' - connected');
if (callback) { callback(); }
} else if (peripheral.state === 'connecting'){
debug(' - connecting....');
//wait until the connection completes, invoke callback
peripheral.once('connect', function(){
if (callback){
callback();
}
})
}
else { //not connected
debug(' - not connected');
//if peripheral is lost by noble<
8
/div>
if (! noble._peripherals[peripheral.id]) {
console.log('No such peripheral! This should not happen, restart manually...');
return
}
peripheral.connect( function(error) {
if (error) {
debug('checkconnected -> reconnect error !'.red + error)
} else {
debug('checkconnected -> reconnect');
}
if (callback) { callback(error); };
});
}
}
noble.on('discover', function(peripheral) {
var alreadyDiscovered=false;
if (peripherals[peripheral.id]) {
alreadyDiscovered=true;
}
peripherals[peripheral.id] = peripheral;
debug('DISCOVER: '+ peripheral.id + ', target: ' + targetPeripheralId)
if ((peripheral.id === targetPeripheralId)) {
eventEmitter.emit('targetDiscovered');
}
sendEvent({
type: 'discover',
peripheralId: peripheral.id,
address: peripheral.address,
addressType: peripheral.addressType,
connectable: peripheral.connectable,
advertisement: {
localName: peripheral.advertisement.localName,
txPowerLevel: peripheral.advertisement.txPowerLevel,
serviceUuids: peripheral.advertisement.serviceUuids,
manufacturerData: (peripheral.advertisement.manufacturerData ? peripheral.advertisement.manufacturerData.toString('hex') : null),
//todo convert object to array
serviceData: (peripheral.advertisement.serviceData ? peripheral.advertisement.serviceData.toString('hex') : null),
eir: (peripheral.advertisement.eir ? peripheral.advertisement.eir.toString('hex') : null),
scanResponse: (peripheral.advertisement.scanResponse ? peripheral.advertisement.scanResponse.toString('hex') : null)
},
rssi: peripheral.rssi
});
if (alreadyDiscovered) {
//return - we do not need to setup the event listeners again
return
}
peripheral.on('connect', function() {
sendEvent({
type: 'connect',
peripheralId: this.uuid
});
});
peripheral.on('disconnect', function() {
sendEvent({
type: 'disconnect',
peripheralId: this.uuid
});
for (var i in this.services) {
for (var j in this.services[i].characteristics) {
for (var k in this.services[i].characteristics[j].descriptors) {
this.services[i].characteristics[j].descriptors[k].removeAllListeners();
}
this.services[i].characteristics[j].removeAllListeners();
}
this.services[i].removeAllListeners();
}
this.removeAllListeners();
if (keepTargetConnected) {
debug('Keep connected ')
if (!isClientConnected) {
// we wait here for the targeted mobile phone to connect to bleno-cloned device
// otherwise we will most probably connect to ourselves
// TODO: as an option, it will not be a problem if remote or different MAC
sendEvent({
type: 'initializeStatus',
peripheralId: peripheral.id,
status: 'waiting with reconnect to target device for client connection to bleno...'
});
if (! eventEmitter.listeners('clientConnected').length) {
eventEmitter.once('clientConnected', function(){
sendEvent({
type: 'initializeStatus',
peripheralId: peripheral.id,
status: 'client connection to bleno, reconnecting to target device'
});
checkConnected(peripheral);
})
}
} else {
debug('reconnect');
checkConnected(peripheral);
}
}
}); //on disconnect
peripheral.on('rssiUpdate', function(rssi) {
sendEvent({
type: 'rssiUpdate',
peripheralId: this.uuid,
rssi: rssi
});
});
peripheral.on('servicesDiscover', function(services) {
debug('--- on servicesDiscover');
var peripheral = this;
var exportServices = [];
var includedServicesDiscover = function(includedServiceUuids) {
sendEvent({
type: 'includedServicesDiscover',
peripheralId: peripheral.id,
serviceUuid: this.uuid,
includedServiceUuids: includedServiceUuids
});
};
var characteristicsDiscover = function(characteristics) {
var service = this;
var discoveredCharacteristics = [];
var read = function(data, isNotification) {
var characteristic = this;
sendEvent({
type: 'read',
peripheralId: peripheral.id,
serviceUuid: service.uuid,
characteristicUuid: characteristic.uuid,
data: data.toString('hex'),
isNotification: isNotification
});
};
var write = function() {
var characteristic = this;
sendEvent({
type: 'write',
peripheralId: peripheral.id,
serviceUuid: service.uuid,
characteristicUuid: characteristic.uuid
});
};
var broadcast = function(state) {
var characteristic = this;
sendEvent({
type: 'broadcast',
peripheralId: peripheral.id,
serviceUuid: service.uuid,
characteristicUuid: characteristic.uuid,
state: state
});
};
var notify = function(state) {
var characteristic = this;
sendEvent({
type: 'notify',
peripheralId: peripheral.id,
serviceUuid: service.uuid,
characteristicUuid: characteristic.uuid,
state: state
});
};
var descriptorsDiscover = function(descriptors) {
var characteristic = this;
var discoveredDescriptors = [];
var valueRead = function(data) {
var descriptor = this;
sendEvent({
type: 'valueRead',
peripheralId: peripheral.id,
serviceUuid: service.uuid,
characteristicUuid: characteristic.uuid,
descriptorUuid: descriptor.uuid,
data: data.toString('hex')
});
};
var valueWrite = function(data) {
var descriptor = this;
sendEvent({
type: 'valueWrite',
peripheralId: peripheral.id,
serviceUuid: service.uuid,
characteristicUuid: characteristic.uuid,
descriptorUuid: descriptor.uuid
});
};
//have to get it from _gatts, only there is handle number stored
var rawDescriptors = peripheral._noble._bindings._gatts[peripheral.id]._descriptors[service.uuid][characteristic.uuid];
for (var k in descriptors) {
var descriptorValue='';
var descriptorUuid = descriptors[k].uuid;
descriptors[k].on('valueRead', valueRead);
descriptors[k].on('valueWrite', valueWrite);
var exportDescriptor = {
handle: rawDescriptors[descriptorUuid].handle,
uuid: descriptorUuid,
}
discoveredDescriptors.push(exportDescriptor);
}
sendEvent({
type: 'descriptorsDiscover',
peripheralId: peripheral.id,
serviceUuid: service.uuid,
characteristicUuid: this.uuid,
descriptors: discoveredDescriptors
});
};
for (var j = 0; j < characteristics.length; j++) {
var characteristic = characteristics[j];
characteristic.on('read', read);
characteristic.on('write', write);
characteristic.on('broadcast', broadcast);
characteristic.on('notify', notify);
characteristic.on('descriptorsDiscover', descriptorsDiscover);
discoveredCharacteristics.push({
uuid: characteristic.uuid,
name: characteristic.name,
properties: characteristic.properties,
//we have to get it from internal noble _gatts objects
startHandle : peripheral._noble._bindings._gatts[peripheral.id]._characteristics[service.uuid][characteristic.uuid].startHandle,
valueHandle : peripheral._noble._bindings._gatts[peripheral.id]._characteristics[service.uuid][characteristic.uuid].valueHandle,
endHandle : peripheral._noble._bindings._gatts[peripheral.id]._characteristics[service.uuid][characteristic.uuid].endHandle
});
}
sendEvent({
type: 'characteristicsDiscover',
peripheralId: peripheral.id,
serviceUuid: this.uuid,
characteristics: discoveredCharacteristics
});
};
for (var i in services) {
service=services[i];
service.on('includedServicesDiscover', includedServicesDiscover);
service.on('characteristicsDiscover', characteristicsDiscover);
var exportService = {
uuid: service.uuid,
name: service.name,
type: service.type,
//we have to get handle numbers from _gatts
startHandle: peripheral._noble._bindings._gatts[peripheral.id]._services[service.uuid].startHandle,
endHandle: peripheral._noble._bindings._gatts[peripheral.id]._services[service.uuid].endHandle,
};
exportServices.push(exportService);
}
sendEvent({
type: 'servicesDiscover',
peripheralId: this.uuid,
services: exportServices
});
});
peripheral.on('handleRead', function(handle, data) {
sendEvent({
type: 'handleRead',
peripheralId: this.uuid,
handle: handle,
data: data.toString('hex')
});
});
peripheral.on('handleWrite', function(handle) {
sendEvent({
type: 'handleWrite',
peripheralId: this.uuid,
handle: handle
});
});
});
function explore(peripheralId, readValues, callback) {
var peripheral=peripherals[peripheralId];
/*
//was previously initialized for other device
if (targetPeripheralId && targetPeripheralId != peripheralId) {
deinitialize(targetPeripheralId, function(){
console.log('re-initialize for other device ');
})
}
targetPeripheralId = peripheralId;
*/
if (!peripheral) {
sendEvent({
type:'explore',
peripheralId: peripheralId,
state: 'startScan'
})
targetPeripheralId = peripheralId;
noble.startScanning();
eventEmitter.once('targetDiscovered', function(){
noble.stopScanning();
sendEvent({
type: 'explore',
peripheralId: peripheralId,
state: 'discovered'
})
exploreServices(peripherals[peripheralId], readValues, callback);
})
} else {
exploreServices(peripherals[peripheralId], readValues, callback);
}
}
function exploreServices(peripheral, readValues, callback) {
var exportServices=[];
var peripheralId = peripheral.id;
sendEvent({
type:'explore',
peripheralId: peripheral.id,
state: 'start'
})
peripheral.connect( function(error) {
if (error){
console.log('Explore: connect error: '.red + error + ' - try hciconfig reset...');
}
peripheral.discoverServices([], function(error, services) {
debug('Explore: discoverServices');
var serviceIndex = 0;
if (!servicesCache[peripheralId]) {
servicesCache[peripheralId] = {
services : [],
handles : []
}
}
async.whilst(
function () {
return (serviceIndex < services.length);
},
function(callback) {
var service = services[serviceIndex];
var serviceInfo = service.uuid;
var exportService = {
uuid: service.uuid,
name: service.name,
type: service.type,
startHandle: peripheral._noble._bindings._gatts[peripheral.id]._services[service.uuid].startHandle,
endHandle: peripheral._noble._bindings._gatts[peripheral.id]._services[service.uuid].endHandle,
characteristics: []
};
if (service.name) {
serviceInfo += ' (' + service.name + ')';
}
debug(serviceInfo);
if (!servicesCache[peripheralId].services[service.uuid]) {
servicesCache[peripheralId].services[service.uuid] = { characteristics : []};
}
service.discoverCharacteristics([], function(error, characteristics) {
var characteristicIndex = 0;
var userDescriptorValue='';
async.whilst(
function () {
return (characteristicIndex < characteristics.length);
},
function(callback) {
var characteristic = characteristics[characteristicIndex];
var exportCharacteristic = {uuid: characteristic.uuid, name: characteristic.name, properties: characteristic.properties, value: "", descriptors: []};
var characteristicInfo = ' ' + characteristic.uuid;
servicesCache[peripheralId].services[service.uuid].characteristics[characteristic.uuid]= {
properties : characteristic.properties,
descriptors : []
};
if (characteristic.name) {
characteristicInfo += ' (' + characteristic.name + ')';
}
async.series([
//get the descriptors, fill 2901 (user descriptor) value
function(callback) {
characteristic.discoverDescriptors(function(error, descriptors) {
async.detect(
descriptors,
function(descriptor, callback) {
return callback(null, descriptor.uuid === '2901');
},
function(error, userDescriptionDescriptor){
if (userDescriptionDescriptor && readValues) {
userDescriptionDescriptor.readValue(function(error, data) {
if (data) {
userDescriptorValue=data.toString();
// debug(' Descriptor value: '+ userDescriptorValue);
characteristicInfo += ' (' + userDescriptorValue + ')';
} else userDescriptorValue='';
callback();
});
} else {
callback();
}
}
);
});
},
function(callback){
var descriptorIndex = 0;
var exportDescriptor;
//have to get it from _gatts, only there is handle # stored
var rawDescriptors = peripheral._noble._bindings._gatts[peripheral.id]._descriptors[service.uuid][characteristic.uuid];
var descriptorValue = '';
for (var descriptorUuid in rawDescriptors) {
servicesCache[peripheralId].services[service.uuid].characteristics[characteristic.uuid].descriptors[descriptorUuid]=rawDescriptors[descriptorUuid].handle;
//get value of user description
if (descriptorUuid === '2901') {
//from previous async series function
descriptorValue = userDescriptorValue;
}
// else if (descriptorUuid === '2902') {
// 2902 - bit 0 = notifications: enabled/disabled, bit 1 = indications enabled/disabled
// it may be helpful after reconnect
// descriptorValue = '';
// }
else descriptorValue='';