how to send text file to HC 05 bluetooth from android application - bluetooth

Question

My HC 05 Bluetooth module is connected with 8051 at receive side.
I want to send simple text file using android mobile to HC 05 module.
How could i do that?

Answer 1

If you use Java.
First of all, you should get default Bluetooth adapter:
BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
Next you should get MAC address of your HC-05, you can just check it in connection list in Bluetooth settings of your phone, or you can scan nearby devices in your app and check their names:
/* Check HC-05 in paired devices */
public void findInPairedDevices() {
Set<BluetoothDevice> pairedDevices = adapter.getBondedDevices();
if (pairedDevices.size() > 0) {
for (BluetoothDevice device : pairedDevices) {
if (device.getName().equals("HC-05")) {
MACaddress = device.getAddress();
}
}
}
}
/* Scan nearby devices for HC-05 */
public void findInAvailableDevices() {
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
if (device.getName().equals("HC-05")) {
MACaddress = device.getAddress();
adapter.cancelDiscovery();
}
}
}
};
activity.registerReceiver(broadcastReceiver, filter);
int MY_PERMISSIONS_REQUEST_ACCESS_COARSE_LOCATION = 1;
/* Permission for Bluetooth search */
ActivityCompat.requestPermissions(activity,
new String[]{Manifest.permission.ACCESS_COARSE_LOCATION},
MY_PERMISSIONS_REQUEST_ACCESS_COARSE_LOCATION);
adapter.startDiscovery();
}
After getting MAC address you can get your HC-05:
BluetoothDevice device = adapter.getRemoteDevice(MACaddress);
And can create socket:
BluetoothSocket socket = device.createRfcommSocketToServiceRecord(myUUID);
Where myUUID is your UUID which you can get using:
myUUID = UUID.fromString("Your UUID string");
Finally, start socket:
socket.connect();
Next you can use InputStream and OutputStream for communicating with HC-05:
if (socket.isConnected()) {
InputStream inputStream = socket.getInputStream();
OutputStream outputStream = socket.getOutputStream();
}
For reading input message:
byte[] buffer = new byte[256];
int bytes;
bytes = inputStream.read(buffer);
String inMsg = new String(buffer, 0, bytes);
And for writing output message:
String outStr = "Meow";
outputStream.write(outStr.getBytes());
After work you should close streams and socket:
inputStream.close();
outputStream.close();
socket.close();
Note: you mustn't forget about exceptions.