Print in bluetooth device-Xamarin - xamarin

Question

I am developing a cross platform app.
I need print in printer Intermec PR2
I use this codes:
Class in .Droid
[assembly: Xamarin.Forms.Dependency(typeof(clsBluetooth))]
namespace Bluetooth.Droid
{
public class clsBluetooth : IBluetooth
{
private BluetoothAdapter adapter = BluetoothAdapter.DefaultAdapter;
private BluetoothSocket socket = null;
private BufferedWriter outReader = null;
private BluetoothDevice device = null;
public void Imprimir(string pStrNomBluetooth, int intSleepTime, string pStrTextoImprimir)
{
try
{
string bt_printer = (from d in adapter.BondedDevices
where d.Name == pStrNomBluetooth
select d).FirstOrDefault().ToString();
device = adapter.GetRemoteDevice(bt_printer);
UUID applicationUUID = UUID.FromString("00001101-0000-1000-8000-00805f9b34fb");
socket = device.CreateRfcommSocketToServiceRecord(applicationUUID);
socket.Connect();
outReader = new BufferedWriter(new OutputStreamWriter(socket.InputStream));
outReader.WriteAsync(pStrTextoImprimir);
}
catch (Exception)
{
throw;
}
finally
{
}
}
public ObservableCollection<string> PairedDevices()
{
ObservableCollection<string> devices = new ObservableCollection<string>();
foreach (var bd in adapter.BondedDevices)
devices.Add(bd.Name);
return devices;
}
}
}
Interface in Potable
public interface IBluetooth
{
ObservableCollection<string> PairedDevices();
void Imprimir(string pStrNomBluetooth, int intSleepTime, string pStrTextoImprimir);
}
Call of method
DependencyService.Get<IBluetooth>().Imprimir(SelectedBthDevice,200,"HolaMundo");
My error happens when I enter the class in the .Droid and it executes the sentence socket.Connect (); Does not seem to connect to the device.
Someone could help me to see the script or how the code could change so that the connection to the device works correctly

Answer 1

Try creating the insecure socket communication like:
socket = device.CreateInsecureRfcommSocketToServiceRecord(applicationUUID);
instead of the existing secure one:
socket = device.CreateRfcommSocketToServiceRecord(applicationUUID);
If you are able to connect after that you can write to printer as follows:
byte[] buffer = Encoding.UTF8.GetBytes(pStrTextoImprimir);
socket.OutputStream.Write(buffer, 0, buffer.Length);
For further details refer to.