I need a PROTOCOL of PractiScore APP to develop a new device

Hello everyone, It’s really good to communicate with each other. Now I have a problem. I am developing a new device that it can connects with the PractiScore APP by BLE. But I don’t know send what formatted data because I have no protocol. So I have no idea to send what messages to APP to display or record scores or something. Any body can help me? I will appreciate for you very much.