I'm using a Raspberry Pi 3+ with Stretch installed and updated. I'm trying to connect my Android phone to send and receive commands. After reading hundreds of articles about Bluetooth and Raspi without a solution on Stretch, I'm here to ask how it works. I can connect the devices but I don't get an rfcomm device. The serial protocol is activated. When I pair the devices over the GUI, I get the following error:
Connetion failed-GDBus.Error.org.bluez Error.Failed: Protocol not available. Try to connect manually
I thought that the serial protocol is missing, but also after activating it and reboot, I get the same error.
Any hints on what to do here?