I set up the internal chat function within my cloud. But I can only write to single users, isn’t i possible to write to all users, like in a real chat?
Nice definition of a “real chat”… 
The internal backend doesn’t support group chats, so you have to use your own xmpp server, or try our managed one. But there will still be no automatic broadcast function.
true 
what a pity, then I cant use it for my purposes…