Question with app inventor bluetooth

Good morning . At school they asked me to make an application with app inventor with bluthooth on bitbloq. Seeing the different possibilities I had to make an application, I came up with one using the bitbloq board where by pressing a button I could move an object to one side or the other. The problem is that I don't know if the board does not receive messages from the application or if it cannot interpret them. Since the board flashes saying that it is connected but the send light does not flash. The board, by the way, is the zum core2.0. I would like to know what blocks I should use within the Bluetooth LE1 section within app inventor so that it can read the message sent from the board. Thank you so much