No Luck with Bluetooth connection

[WP-Rue]

Hi,
just cloned the today dbus-btbattery repo again, beginning from step 9 of readme ( after deleting the old folder)

The scan shows 2 of 3 BMS and the MPPT's.. but the next input

./dbus-btbattery.py A5:C2:37:27:04:F4

shows:

root@raspberrypi4:/opt/victronenergy/dbus-btbattery# ./dbus-btbattery.py a5:c2:37:27:04:f4
INFO:BluetoothBattery:Connecting to A5:C2:37:27:04:F4
INFO:BluetoothBattery:Creating virtual battery D-Bus service: com.victronenergy.battery.A5C2372704F4
WARNING:root:USING OUTDATED REGISTRATION METHOD!
WARNING:root:Please set register=False, then call the register method after adding all mandatory paths. See https://github.com/victronenergy/venus/wiki/dbus-api
INFO:BluetoothBattery:Setting up D-Bus paths for virtual battery
INFO:BluetoothBattery:Setting up cell paths for 16 cells with format 1
INFO:BluetoothBattery:D-Bus service initialized: com.victronenergy.battery.A5C2372704F4
ERROR:BluetoothBattery:Connection failed to A5:C2:37:27:04:F4: Failed to connect to peripheral A5:C2:37:27:04:F4, addr type: public
INFO:BluetoothBattery:Connecting to A5:C2:37:27:04:F4
ERROR:BluetoothBattery:Connection failed to A5:C2:37:27:04:F4: Failed to connect to peripheral A5:C2:37:27:04:F4, addr type: public
INFO:BluetoothBattery:Connecting to A5:C2:37:27:04:F4
INFO:BluetoothBattery:Connected successfully to A5:C2:37:27:04:F4
ERROR:BluetoothBattery:Failed to write command to A5:C2:37:27:04:F4: Device disconnected
INFO:BluetoothBattery:Connecting to A5:C2:37:27:04:F4
ERROR:BluetoothBattery:Connection failed to A5:C2:37:27:04:F4: Failed to connect to peripheral A5:C2:37:27:04:F4, addr type: public
INFO:BluetoothBattery:Connecting to A5:C2:37:27:04:F4
INFO:BluetoothBattery:Connected successfully to A5:C2:37:27:04:F4
WARNING:BluetoothBattery:Device A5:C2:37:27:04:F4 disconnected.
ERROR:BluetoothBattery:Timeout waiting for initial general data from A5:C2:37:27:04:F4
ERROR:BTBattery:Failed to get initial battery settings.
ERROR:BTBattery:Failed to create DBUS service, exiting.

-> With the original bradcagle repo I had little more effort: I saw for a short moment the data of one BMS in remote console - but than it disappears again...
So I guess it is somehow complicate to connect with Bluetooth to (several) BMS with Raspberry running Venus OS.
My plan for future will be either serial connection :-( or take a try with an extra ESP32, publishing data with MQTT...
Thanks for your efforts!
Greetings Rue