Android Device as BLE peripheral and GATT client

Question

I am trying to build an Android application which acts as a BLE peripheral and also as GATT client.

These are the steps I am trying to achieve:

1. The Android device starts advertising itself. A second device starts scanning and as soon as it detects the android device it initiates a connection.

2. The Android devices acts as a GATT client and tries to connect to the server device.

The first step seems to work fine, I am able to advertise and the other device (a Bluegiga Evalboard in my case) is able to see the Android device and can establish a connection.

But how am I notified on the Android device that a connection could be established in order to call the function device.connectGatt(context, false, gattCb) to connect to the GATT server?

I also tried it by obtaining the remote device after starting the advertisement.

BluetoothDevice device = bleAdapter.getRemoteDevice(remoteAddress); device.connectGatt(context, false, gattCb);

The only thing that happens, the onConnectionStateChange(BluetoothGatt gatt, int status, int newState) function gets called called from the BluetoothGattCallback just to inform me that the device has disconnected.

What am I missing?

Answer 1

I would suggest to try using, after the advertising period, the getBondedDevices method from your BluetoothAdapter instead of the getRemoteDevice one as you did.