Pubsub Mqtt ClientID

[activationsactions]

Hi everybody,
I would like to ask your help about opcua pubsub latest bera version.

I really cannot understand how to change the default mqtt clientID.
I tried with connectionparameters adding the clientid with the syntax specified in the docs:
Name=connection-.
I read the doc but I cannot understand whether there is a limitazioni or I miss samething.

Hoping to get your help
Thank you Frank