bluetooth connection broken

I am trying to print a picture on a printer. Using another application on my smartphone, I checked the work with this printer via Bluetooth. Everything works. I added permissions to the manifest. In my application, I successfully found out the MAC address of the printer. The search for Bluetooth...

Dear All I would appreciate some help, please. I am trying to create a little app, that can receive a defined set of characters via a Bluetooth connection. As a starting point I used an example I found in the forum using the BluetoothManager class. Unfortunately, the connection to my Bluetooth...