Project Reactor Sink replacement for ApplicationEvent (when not needed transaction)?

[kalwinskidawid]

Hey,
I am interested in the modulith solution, but I can't find a suitable solution. I know that this solution is quite young, so that I can not find many examples.
Let's say I have a Device module that contains create, modify operations, but also the module is responsible for creating a websocket connection to a physical device.

I first created DeviceState in the same module, but the module became huge, so I separated DeviceState into StateManagement module, which is responsible for storing the historical state and returning the latest state.

How should I send the state received in the Device module to the DeviceState module? I don't need transaction in onMessage (ws handler) so I can't use ApplicationEvent.publish.

A good replacement would be Reactor Sink, which is just a simple asynchronous message broker. I have used it before in another project and create events / subscribing worked very smoothly - no transaction creation is required.