How can I create multiple chatrooms using the Drupalchat module?
This question is pretty similar to the (still active) issue about Multiple public chat rooms - role controlled, here is a partial quote from that issue:


  Any chance you can allow the administrator to create more global chat rooms? I would like to create a chat room for Children so Adults cannot gain access and adult rooms where teens and children cannot access.


Comment nr 4 (from the module owner of the DrupalChat module) states the following: this option only exists in "iFlyChat Servers" polling method.

Here are some more details about iFlyChat (= quote from https://iflychat.com/):


  With iFlyChat, websites need not worry about setting chat server of their own. iFlyChat server will take care of the hosting part and will provide a hassle free setup of chat system. We use latest onCloud technology which gives a faster chatting experience to all users of your website.