Listen to events on the board

[NNSTH]

Hello,

Thanks for the great job with this package! We're using it as a docker container and insert an iframe for the board in our app page.
Now, we want to notify the peer user for changes in the board (e.g. if he is offline now), but don't find the correct way to listen to the change events.
We can watch for changes on the json files, but than we can not be sure who created the change and to whom the notify has to be sent.

Any help with this will be appreciated!