Mycroft with bluetooth

Archive - Mycroft Project Archive - Former Random Mycroft Category
1

Hi.
I am trying to setup mycroft with bluetooth. I know it is not supported, but I got it working on an x86 machine pretty easily.
When moving to an ARM machine, i had some issues with pulseaudio but they were fixed after following this:
https://hackaday.io/project/165208-an-old-rotary-phone-as-bluetooth-set/log/162491-setting-up-the-bluetooth

Now my linux machine can play sound just fine from the bluetooth speaker even when paired through a HSP profile.
However now i am in a weird state:

  • microphone works fine, picks up wake work and understands commands
  • when mycroft hears the wake word, a ‘ping’ is heard though the HDMI connection (even though the bluetooth speaker is the default speaker and all other system sounds go there)
  • when mycroft wants to say something, i don’t hear anything. Not from the bluetooth speaker, nor from the HDMI connected TV.
 22:15:25.840 | INFO     |  2122 | __main__:handle_wakeword:67 | Wakeword Detected: hey jarvis
 22:15:26.965 | INFO     |  2122 | __main__:handle_record_begin:37 | Begin Recording...
 22:15:26.982 | ERROR    |  2116 | VolumeSkill | Couldn't allocate mixer, ALSAAudioError('Unable to find mixer control Master,0 [default]')
 22:15:28.964 | ERROR    |  2116 | VolumeSkill | Couldn't allocate mixer, ALSAAudioError('Unable to find mixer control Master,0 [default]')
 22:15:28.944 | INFO     |  2122 | __main__:handle_record_end:45 | End Recording...
 22:15:30.011 | ERROR    |  2116 | VolumeSkill | Couldn't allocate mixer, ALSAAudioError('Unable to find mixer control Master,0 [default]')
 22:15:30.237 | INFO     |  2122 | __main__:handle_utterance:72 | Utterance: ["what's the time"]

That is what mycroft prints out when detecting the wake word.

Does anyone know what might be wrong, or how i can force mycroft to use a specific output?

LaterEdit: Running this on a pi 4 with raspberry pi os

2

Hey there,

I’d first try setting the default pulseaudio sink (aka output).

If that doesn’t work you could set your play commands as described here and use the -D flag to specify the output device to be used.

3

Thanks!
Initially setting the default pulseaudio sink didnt work, but after a few restarts and some messing around, it did. Having the aplay and arecord comands (from the links you sent) helped me speed up debugging by a lot :D.
It works now sort of. Only problem i now have is that the bluetooth microphone is very noisy when connected to the pi… Looks like headset bluetooth devices are kinda broken on ARM :frowning: