docs: add audio recording debug instructions to README

README.md

@@ -61,6 +61,12 @@ sudo ./provision_domain_hostname.sh <new_hostname> <new_domain>
 - If you have issues with mDNS name resolution, check for conflicting mDNS stacks (e.g., systemd-resolved, Bonjour, or other daemons).
 - Some Linux clients may not resolve multi-label mDNS names via NSS—test with `avahi-resolve-host-name` and try from another device if needed.
 
+# record audio and save to file for debugging
+pw-record --target="AVIOUSB-8f6326 : 2:receive_Left" --rate=48000 --channels=1 --format=s24 /tmp/aes67_test.wav &
+RECORD_PID=$!
+sleep 30
+kill $RECORD_PID
+
 # uart reset over hci does not work:
 stty -F /dev/ttyAMA3 -hupcl
 stty -F /dev/ttyAMA3 -a | grep -o 'hupcl' || echo "-hupcl is set"