Bluetooth - Multiple Controllers
When local device / computer supporting multiple Bluetooth controller, must ensure we select the correct one before connecting.
List of connected Bluetooth controllers
Reference: Using Multiple Bluetooth Controller
bluetoothctl list
Select a default controller
Select a Bluetooth controller by MAC address
For convenient, using controller name convert to MAC address:
read "Choose a name of default controller" dev_name
bluetoothctl select $(bluetoothctl list | grep "$dev_name" | awk '{ print $2 }')