total number of participants in the room
Optionaladdedids of added participants, always present (if any) so participants would be able to identify their presence in particular room
Optionaladdedoptional, data for added participants
Optionalremovedoptional, depending on the context may contain either markers for all (sorted) lists available or be empty (if client fails to support chunked participants)
Информация об обновлении комнаты