Question

I’m designin an application in Android that connects the mobile to a bluetooth device. I can do this, as I open a BluetoothSocket like this:

Method m = device.getClass().getMethod("createRfcommSocket", new Class[] {int.class});
socket = (BluetoothSocket) m.invoke(device, 1);
socket.connect();

Where device is the paired device with the mobile bluetooth desired. The thing is, this external device is a bit special, and it has different times for writing and answering to the mobile, so I need to put some timeouts on my socket for reading and writing, but I’ve searched a lot and it seems like BluetoothSocket doesn’t support this.

Can anybody tell me a different way to admin timeouts on reading and writing to the port on the BluetoothSocket class for Android?

Thank you!

Answer 1

Here is the code for reading and writing code:

Writng code on port:

try
{
    // Enviamos los bytes
    DataOutputStream dOut = null;
    dOut = new DataOutputStream(socket.getOutputStream());
    // Send message
    dOut.writeBytes(res);
    dOut.flush();
}
catch (IOException e)
{
    Dialogs.showErrorDialog("Error al recuperar la fecha y hora del dispositivo Nonin.", this);
}

Then, reading from port until response available:

DataInputStream dIn = null;
// We receive the answer
try
{
     dIn = new DataInputStream(socket.getInputStream());
}
catch (IOException e)
{
    Dialogs.showAlertDialog("An exception occured during bluetooth io stream creation", this);
}

while (true)
{
    try
    {
         String data = dIn.readLine(); // readLine();
         byte[] total = EncodingUtils.getBytes(data, "ASCII");
         Dialogs.showInfoDialog("Mensaje ok: " + data.toString(), this);
    }
    catch (IOException e)
    {
          break;
     }
}

The thing is that I think the writing works, as I convert the desired string into bytes, and it works. But then, when I’m waiting for response, it mixes further responses with the desired, and I think this is because timings.

There’s no more code in the middle related with sockets. First, I create it. Then, I try to send a byte String. Then I wait until I receive the answer for the byte String that I just sent.

Thank you in advance.