public MainPage(BluetoothDevice btDevice) { InitializeComponent(); if (btDevice != null) { MessageLabel.Text = $"Trying to connect to Bluetooth device {btDevice.Name}..."; _btDevice = btDevice; _bluetoothDeviceHelper = DependencyService.Get <IBluetoothDeviceHelper>(); Connect2BluetoothDevice(); } else { MessageLabel.Text = "No Bluetooth device found."; } Device.StartTimer(TimeSpan.FromMilliseconds(_timerDelay), OnTimerTick); }