Ble Multi device

controller.js

$scope.onError = function(err) {
    console.log('Error: '+err);
  };

  $scope.onData = function(id, data) {
    console.log(data+' from '+id);
    var a = new Uint8Array(data);
  };

  var Peripheral = function (deviceId) {
    this.deviceId = deviceId;
  };

  Peripheral.prototype.connect = function() {
    var self = this;
    var q = $q.defer();
    console.log('Trying to connect to '+self.deviceId);
    ble.connect(self.deviceId, function(event) {
      q.notify('Connected. Reading DevInfo');
      ble.read(self.deviceId, '180A', '2A29', function(data) { $scope.onData(self.deviceId, data); }, $scope.onError);
      ble.notify(self.deviceId,
        BUDDI_UUIDS.service,
        BUDDI_UUIDS.notification,
        function(data) {
          $scope.onData(self.deviceId, data);
        }, function(err) {
          q.reject(err);
        }
      );
      q.resolve('Done');
    }, function(err) {
      q.reject(err);
    });

    return q.promise;
  };

  ionic.Platform.ready(function() {
    if($scope.doOnce) {
      $scope.doOnce = false;
      ble.isEnabled(
        function() {
          ble.scan([], 5, function(dev) { console.log(dev.name+' : '+dev.rssi+'dBm : '+dev.id+' : '+angular.equals(dev.id, 'D0:39:72:F1:E9:72')); }, function(err) { $scope.onError(err); });
          var band1 = new Peripheral('D0:39:72:F1:E9:72');
          band1.connect().then(function(msg) {
            console.log('Success: ' + msg);
            $scope.devices.push(band1);
          }, function(err) {
            console.log('Error: ' + err);
          }, function(update) {
            console.log('Notification: ' + update);
          });
          var band2 = new Peripheral('D0:39:72:F1:EA:81');
          band2.connect().then(function(msg) {
            console.log('Success: ' + msg);
            $scope.devices.push(band2);
          }, function(err) {
            console.log('Error: ' + err);
          }, function(update) {
            console.log('Notification: ' + update);
          });
          if($scope.devices.length > 0) {
            $scope.connectionCheck();
          }
        },
        function() {
          var alertPopup = $ionicPopup.alert({
            title: 'Bluetooth disabled',
            template: 'Please enable bluetooth on your device before continuing'
          });
          alertPopup.then(function(res) {
            // if(ionic.Platform.isAndroid())
            ionic.Platform.exitApp();
          });
        }
      );
    } else {
      console.log('Skipping call to Platform.ready');
    }