feat(non-participant-messages) Add a new JitiConferenceEvent for messages ignored by ENDPOINT_MESSAGE_RECEIVED

JitsiConferenceEventManager.js

@@ -421,10 +421,9 @@ JitsiConferenceEventManager.prototype.setupChatRoomListeners = function() {
                     JitsiConferenceEvents.ENDPOINT_MESSAGE_RECEIVED,
                     participant, payload);
             } else {
-                logger.warn(
-                    'Ignored XMPPEvents.JSON_MESSAGE_RECEIVED for not existing '
-                    + `participant: ${from}`,
-                    payload);
+                conference.eventEmitter.emit(
+                    JitsiConferenceEvents.NON_PARTICIPANT_MESSAGE_RECEIVED,
+                    id, payload);
             }
         });
 

JitsiConferenceEvents.js

@@ -190,6 +190,12 @@ export const NO_AUDIO_INPUT = 'conference.no_audio_input';
  */
 export const NOISY_MIC = 'conference.noisy_mic';
 
+/**
+ * Indicates that a message from the local user or from the Prosody backend
+ * was received on the data channel.
+ */
+export const NON_PARTICIPANT_MESSAGE_RECEIVED = 'conference.non_participant_message_received';
+
 /**
  * New private text message was received.
  */