peer-connection

https://tools.ietf.org/html/rfc8261

For now all users that can join the audio stream are admins. I've extended userController by

    const role = users.length === 0 ? 'admin' : 'visitor'
    const user = {id,name,room,role};
...
    const role = usersInVoice.length === 0 ? 'admin' : 'visitor'
    const user = {id,name,room,role};

and replaced user:admin with user:user.role. In result, we have two roles of users.

making changes to the backend in express.js