Setting the notification for all users to follow as standard

And there is mobile apps at Play Store and Apple App Store that can use chat server URL and username and password to login to hcat

RocketChat Experimental by RocketChat

For each board, you can set separate webhook that sends messages to some specific chat channels

at RocketChat Admin Panel Integrations

Wekan has Outgoing Webhook, to RocketChat Incoming Webhook

So in RocketChat Admin Panel you create incoming webhook URL, and paste it to Wekan Board Outgoig Webhook

It is also possible to limit webhook data https://github.com/wekan/wekan/issues/2830

At Admin Panel is also Global Webhooks https://github.com/wekan/wekan/pull/2665

So it send all changes of all boards to webhook

so it you add all users to RocketChat channel, all get notifications of changes

Although using Global Webhooks could make Wekan slower. I'm looking how to make Wekan faster.

it depends how many changes are happening at all boards at once, it could be very many notifications.

Anyway, it RocketChat is the advantage, that you can scroll up to see old messages