Bluetooth communication using LinkKey is not possible with balenaOS 2.43.0 + rev1

When balenaOS is updated to balenaOS 2.43.0 + rev1, Bluetooth communication using LinkKey is not possible.

I was running a python program with systemd service, and used pyserial to communicate with it.

And the following command was executed in the container, but communication is not possible.

root@HOSTNAME :/home/pi# hciconfig hci0 sspmode 0
root@HOSTNAME :/home/pi# hciconfig hci0 auth
root@HOSTNAME :/home/pi# hciconfig hci0 encrypt
root@HOSTNAME :/home/pi# rfcomm bind 0 XX:XX:XX:XX:XX:11
DBUS_SYSTEM_BUS_ADDRESS=unix:path=/host/run/dbus/system_bus_socket bluetoothctl
[NEW] Controller XX:XX:XX:XX:XX:00 HOSTNAME [default]
[bluetooth]# agent KeyboardOnly 
Agent registered
[NEW] Device XX:XX:XX:XX:XX:11 BT_Device
[DEL] Device XX:XX:XX:XX:XX:11 BT_Device
[bluetooth]# default-agent 
Default agent request successful
[NEW] Device XX:XX:XX:XX:XX:11 BT_Device
Request PIN code
[agent] Enter PIN code: hogehoge
[CHG] Device XX:XX:XX:XX:XX:11 Connected: yes
[CHG] Device XX:XX:XX:XX:XX:11 ServicesResolved: yes
[CHG] Device XX:XX:XX:XX:XX:11 Paired: yes
[CHG] Device XX:XX:XX:XX:XX:11 ServicesResolved: no
[CHG] Device XX:XX:XX:XX:XX:11 Connected: no
[CHG] Device XX:XX:XX:XX:XX:11 Connected: yes
[CHG] Device XX:XX:XX:XX:XX:11 Connected: no
[bluetooth]# exit
Agent unregistered
[DEL] Controller XX:XX:XX:XX:XX:00 HOSTNAME [default]
Failed to unregister advertisement method

When you execute the above, LinkKey information is saved in /var/lib/bluetooth/XX:XX:XX:XX:XX:00/XX:XX:XX:XX:XX:11/info of Host OS.

The bluetoothd log is below.

root@HOSTNAME:/var/lib/bluetooth# journalctl -u bluetooth -xfe
Date HOSTNAME bluetoothd[167]: Starting SDP server
Date HOSTNAME bluetoothd[167]: binding L2CAP socket: Address already in use
Date HOSTNAME bluetoothd[167]: Server initialization failed
Date HOSTNAME bluetoothd[167]: Bluetooth management interface 1.14 initialized
Date HOSTNAME bluetoothd[167]: Failed to start listening: l2cap_bind: Address already in use (98)
Date HOSTNAME bluetoothd[167]: Failed to create GATT database for adapter
Date HOSTNAME bluetoothd[167]: Unable to register new adapter

I suspect that the container side cannot communicate using the Host OS LinkKey, but I don’t know how to solve it.

Please give me your help.

I looks like there are two bind actions on that device. Could you check the output of rfcomm show 0 before issuing the bind command?
Kind regards,

Thank you for your reply.

The output of “rfcomm show 0” before issuing the bind command is as follows.
It also shows the output of “rfcomm show 0” after issuing the bind command.

root@HOSTNAME:/home/pi# rfcomm show 0
Get info failed: No such device
root@HOSTNAME:/home/pi# rfcomm bind 0 XX:XX:XX:XX:XX:11
root@HOSTNAME:/home/pi# rfcomm show 0
rfcomm0: XX:XX:XX:XX:XX:11 channel 1 closed

That’s all, thank you very much.

Hi @t-higashi
What device are you running this on? Is it a Raspberry Pi?
If yes, I wonder if our balenaSound project works on your device with LinkKey.