Hi Franck,
As George commented in the issue, the apps are not currently maintained. The browser wallet implementation was only suitable as a POC – it did sign the right states in the right order, but wasn’t designed well to work at scale.
We have implemented a node-js wallet that runs in the server. This may be a good place to try out Waku, as the messaging layer is now configurable.
For instance, a socket-io message service is implemented here. It’s used in one of our e2e tests here.
You could try implementing a WakuMessagingService, and we could see if it works in the e2e test. Is that a sensible thing to do?