Thanks a lot for your prompt responses.
I am using the same approach than in io.temporal.samples.hello.HelloSignal now and it works like a charm.
@tihomir Just for the sake of documentation for potential further readers, I deliberately do not use workflow interfaces to decouple in this way: springboot-microservices-managed-by-temporal-io-rabbitmq since multiple microservices will rely on Temporal queues to communicate together with NO shared code.
Thanks, Seb.