Multiroom chat

Hi, all!
I have a simple question.
How to create multiroom chat on Photon Server (not on photon cloud)?

I found on client:
- keepMasterConnection - fot staing in master lobby always
- masterPeer.sendOperation - for sending to master
on server almost nothing.. maybe AppLobbyType.ChannelLobby

I also found Photon.Chat.ChatClient with subscriptions and so on, but it's not work with Photon Server (maybe only with cloud)

Someone?