https://www.airsistant.com/home
I was able to capture the bluetooth-communication with the app, but i have no idea how to do the next steps with wireshark. If someone is interested, they can use this:
https://mega.nz/file/QQN3xDbI#RWRLOK17N0noKzXKHNevyefXt2vB2LqlfB95l3Mqtis