• Request when inviting / disinviting a user to a meeting (used to notify other users that know about that room but might be connected to another room):
  

  nextcloud-spreed-signaling/talk/api.go

  Line 116 in d6264df

  AllUserIds []string `json:"alluserids,omitempty"`

  
  

  nextcloud-spreed-signaling/talk/api.go

  Line 125 in d6264df

  AllUserIds []string `json:"alluserids,omitempty"`

• Request when a room is updated (used to notify other users that know about that room but might be connected to another room):
  

  nextcloud-spreed-signaling/talk/api.go

  Line 129 in d6264df

  type BackendRoomUpdateRequest struct {

• Request when a room is deleted (used to notify other users that know about that room but might be connected to another room):
  

  nextcloud-spreed-signaling/talk/api.go

  Line 135 in d6264df

  UserIds []string `json:"userids,omitempty"`

• Request when the "InCall" flag of a user changed:
  

  nextcloud-spreed-signaling/talk/api.go

  Line 143 in d6264df

  Users []api.StringMap `json:"users,omitempty"`

• Request when user properties changed:
  

  nextcloud-spreed-signaling/talk/api.go

  Line 148 in d6264df

  Users []api.StringMap `json:"users,omitempty"`

• Request when switching sessions to a different room (might not be relevant for large rooms):
  

  nextcloud-spreed-signaling/talk/api.go

  Lines 165 to 170 in d6264df

  	// Sessions is either a BackendRoomSwitchToSessionsList or a
  	// BackendRoomSwitchToSessionsMap.
  	// In the map, the key is the session id, the value additional details
  	// (or null) for the session. The details will be included in the request
  	// to the connected client.
  	Sessions json.RawMessage `json:"sessions,omitempty"`

@danxuliu FYI