Communicating between iOS and Android with Bluetooth LE

Question

I\'ve got a working app using CoreBluetooth to communicate between an iPad (central) and iPhone (peripheral). I have one service that has two characteristics. I have a Nexus

Answer 1

I am doing something similar with an Android central and an iOS peripheral. I found that they would disconnect if nothing subscribed to any of the peripheral's services.

Don't forget to update the descriptor when subscribing else it doesn't actually do anything (i.e. call the delegate method on the iOS side).

public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic, boolean enabled) {
    if (mBluetoothAdapter == null || mBluetoothGatt == null) {
        Log.v(TAG, "BluetoothAdapter not initialized");
        return;
    }

    UUID uuid = UUID.fromString("00002902-0000-1000-8000-00805f9b34fb");    // UUID for client config desc
    BluetoothGattDescriptor descriptor = characteristic.getDescriptor(uuid);
    descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
    mBluetoothGatt.writeDescriptor(descriptor);

    mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);
}

It might also be of note that I couldn't even see the iOS device doing an normal BLE scan on the Android device (startLeScan), but starting a BT Classic scan with a broadcast receiver solved the problem (startDiscovery).