Hi,
Thanks a lot, it works.
If I remove mysensors from the yaml I can actually call a reboot again without problems.

i had only the serial usb-gateway in the configuration.yaml

MySensors now works without the entry in the yaml. After a reboot all entities are listed and work. but how can i change the parameters, e.g. the serial port of the gateway?

here the section which concerns mysensors.

mysensors:
gateways:

• device: '/dev/serial/by-id/usb-1a86_USB2.0-Serial-if00-port0'
  optimistic: true
  persistence: true
  version: 'V2.0'

logger:
default: info
logs:
homeassistant.components.mysensors: debug
mysensors: debug

when changing from a tcp gateway (wemos D1) to a serial gateway, i noticed that there must be some differences between the two gateways.

the serial interface does not connect S_Mutimeter and V_Voltage
the TCP gateway can do that without problems

i tried it with my own sketch as well as with MockMySensors.ino.

in mockMysSensors i activate 3 entities. one of them is S_Multimeter.
with the serial gateway only 2 entities are recognized
with the TCP Gateway all 3 entities are recognized.

i use homeassistant version 2023.3.4
MySensors version 2.3.2

who can help here?

best regards
branther

Translated with www.DeepL.com/Translator (free version)

Sorry, also here you can close the post
it turned out that some components were defective.
it took me a long time to discover it and I disposed of the components.
serial gateway works flawlessly with my voltmeter un my motor vehicle.

greetings
branther