addDevice(device) {
    if(!this.devices) {
      this.devices = new Set();
    }

    this.devices.add(device);
  }
/**
   * Adds a new object to the set of devices
   *
   * @param {binding.Entity} device will be added to the device set to receive the push notification
   */
Adds a new object to the set of devices
@param {binding.Entity} device will be added to the device set to receive the push notification
Adds a new object to the set of devices @param { binding . Entity } device will be added to the device set to receive the push notification
addDevice(device) {
    if(!this.devices) {
      this.devices = new Set();
    }
    this.devices.add(device);
  }
addDevice ( device ) { if ( ! this . devices ) { this . devices = new Set ( ) ; } this . devices . add ( device ) ; }
Adds a new object to the set of devices
 @param {binding.Entity} device will be added to the device set to receive the push notification
Adds a new object to the set of devices @param { binding . Entity } device will be added to the device set to receive the push notification