Communication: New message notification not being sent to web socket

[anian03]

Describe the bug

When a new message is written to a conversation/channel that I participate in, there should be notifications about it on the web socket topic /user/topic/metis/courses/{courseId}/conversations/user/{userId} with type MetisCrudAction.NEW_MESSAGE. I found this function in the code base that is supposed to be doing this, but it doesn't seem to be called anywhere.

Artemis/src/main/java/de/tum/cit/aet/artemis/communication/service/conversation/ConversationService.java

Line 292 in e3f1c92

public void notifyAllConversationMembersAboutNewMessage(Course course, Conversation conversation, Set<User> recipients) {

Because of this, the unread indicators on the iOS app are not being updated when new messages arrive (ls1intum/artemis-ios#214).

To Reproduce

1. Open a course's conversation page on Artemis
2. Open the dev tools and go to the network tab
3. Click on websocket
4. Open the same course as another user in another tab/device
5. Send a message to a conversation
6. Observe that in the original tab, no message arrives in the web socket topic /user/topic/metis/courses/{courseId}/conversations/user/{userId}.
   The client is only notified about the message itself on other topics if subscribed, such as /topic/metis/courses/{courseId}.

Expected behavior

A payload with type MetisCrudAction.NEW_MESSAGE should be sent to the /user/topic/metis/courses/{courseId}/conversations/user/{userId} topic via the web socket.

Screenshots

No response

Which version of Artemis are you seeing the problem on?

7.7.1

What browsers are you seeing the problem on?

Safari

Additional context

No response

Relevant log output

No response