Multi User Chat - Maximum Number of users

Hi ,
We are assigned to develop a broadcast system for healthcare sector. Our idea is to use ejabberd , but requirements is, app should be able broadcast message to huge number of participants,(600K users), Only group admin can broadcast , but participants may reply, which is only visible to admin. is it possible to handle 600k users in one room ? Or do I need to consider some other design ?

I think pubsub is best for

I think pubsub is best for that kind of use case.

I develop my own muc module

I develop my own muc module and send xmpp messages to online users' app only. While offline users' app can get the message back while they are online

I that case client and server

I that case client and server has to parse and route all incoming packet. I think it is less optimized than to use pubsub.

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