there is a real-time voice broadcast scenario where the server pushes messages to the client APP
the self-built WebSocket service always fails to receive messages from customers

then adopted the real-time communication engine of some third-party manufacturer really good news loss rate greatly reduced user feedback

but now that manufacturer is going offline for some reason

We investigated the MQTT protocol and ran away with demo, but he didn"t implement the sync message mechanism. If you want to use it, you still need to write a lot of logic

I have also seen several MQTT news scenarios such as EMQ, which do not quite meet our needs.
do you have any better solutions