A bluetooth speaker that is also a serial port / 2020-12-23

I acquired a Blaupunkt BLP6100 Bluetooth speaker. Which turns out to support the following services via bluetooth:

• Headset (audio for phone calls)
• Handsfree operation (use buttons to accept, hangup or reject calls)
• Audio sink (the main function of a bluetooth speaker)
• Serial port

That last one I did not expect. I have tried opening the port with minicom and it will say carrier detect but sofar trying to wake it at 115200 or 9600 hasn't resulted in anything.

As a linux audio device it works fine. Or as a bluetooth speaker for my phone so I can listen to podcasts while walking around at home.

But the serial port makes me wonder!