Connecting a BluetoothLE Remote Shutter to an APP

Hello everybody,

I trie to connect an BLE Remote Shutter (hama BRS3) with my app. With the Tutorial "App Inventor + IoT: Basic
Bluetooth Connection Setup" i made the connection. So the problem now is to receive the button-click (Volume-up). Which UUID do I have to use with which command (ReadStrings/ReadBytes...)???

Here are the informations about the hama BRS3:

I would be very grateful for any help!!! :slight_smile: