How to send and receive files using Bluetooth in xamrin android help m

Please check this and let me know if any other help required

byte[] Talk2BTsocket(BluetoothSocket socket, byte[] cmd, Mutex _mx, int timeOut = 150)
{
var buf = new byte[0x20];
_mx.WaitOne();
try
{
using (var ost = socket.OutputStream)
{
var _ost = (ost as OutputStreamInvoker).BaseOutputStream;
_ost.Write(cmd, 0, cmd.Length);
}
// needed because when skipped, it can cause no or invalid data on input stream
Thread.Sleep(timeOut);
using (var ist = socket.InputStream)
{
var _ist = (ist as InputStreamInvoker).BaseInputStream;
var aa = 0;
if ((aa = _ist.Available()) > 0)
{
var nn = _ist.Read(buf, 0, aa);
System.Array.Resize(ref buf, nn);
}
}
}
catch (System.Exception ex)
{
DisplayAlert(ex.Message);
}
finally
{
_mx.ReleaseMutex(); // must be called here !!!
}
return buf;
}

3 Replies

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Rajanikant Hawaldar5y ago
Accepted answer
Please check this and let me know if any other help required
byte[] Talk2BTsocket(BluetoothSocket socket, byte[] cmd, Mutex _mx, int timeOut = 150)
{
    var buf = new byte[0x20];
    _mx.WaitOne();
    try
    {
        using (var ost = socket.OutputStream)
        {
            var _ost = (ost as OutputStreamInvoker).BaseOutputStream;
            _ost.Write(cmd, 0, cmd.Length);
        }
        // needed because when skipped, it can cause no or invalid data on input stream
        Thread.Sleep(timeOut);
        using (var ist = socket.InputStream)
        {
            var _ist = (ist as InputStreamInvoker).BaseInputStream;
            var aa = 0;
            if ((aa = _ist.Available()) > 0)
            {
                var nn = _ist.Read(buf, 0, aa);
                System.Array.Resize(ref buf, nn);
            }
        }
    }
    catch (System.Exception ex)
    {
        DisplayAlert(ex.Message);
    }
    finally
    {
        _mx.ReleaseMutex();     // must be called here !!!
    }
    return buf;
}
Sachin Singh5y ago
In addition to @Rajnikant sir answer
if you want to explore more
visit https://riptutorial.com/xamarin-android/example/32518/send-and-receive-data-from-and-to-bluetooth-device-using-socket
Andy5y ago
OK I will check and let you know