Hi,
We are using Raspberry Pi4 with Zero Pi Codec. We are getting audio from a stereo mic and want to transmit this audio to Bluetooth headphones. The program works fine until we want to connect it to Bluetooth. It connects for 5 seconds but it disconnects. We are using the code in Python and using Alsa API. Is it something you can help with?
This is the error we get:
Running ['vc4hdmi0', 'vc4hdmi1', 'Zero']
HFPDevice class is initialised, using 00:14:BE:65:46:CA
Starting HSP/HFP found on RFCOMM channel 10
HSP/HFP service level connection is established
> AT+BRSF=955 < +BRSF: 0
< OK > AT+CIND=? < +CIND: ("service",(0,1)),("call",(0,1))
< OK >
AT+CIND?
< +CIND: 1,0 <
OK > AT+CMER=3, 0, 0, 1
< OK Read loop start Audio connection is established, mtu = 64
> AT+VGS=10 < ERROR > AT+VGM=00
< ERROR > AT+BTRH? < ERROR >
AT+XAPL=0012-000-0100,3 < ERROR > AT+IPHONEACCEV=2,1,9,2,0
< ERROR > AT+IPHONEACCEV=2,1,9,2,0 < ERROR > AT+BIA=0,1,0
ERROR Capture audio failed Read loop stop Service level connection disconnected: [Errno 103] Software caused connection abort

And we we run the "sudo systemctl status bluetooth" on the consol, we get the error

 

I don't know if this will help, but it was the first thing that popped up searching "bluetooth sap server"

https://raspberrypi.stackexchange.com/questions/40839/sap-error-on-bluetooth-service-status