- How often do they communicate?
It depends on how long you set the heartbeat interval. Default is 4 hours.
- Can I set this time interval to a desired value?
Yes.
- If yes, what are the limits?
The farthest that can be configured is 48 hours.
- Can both sides start communication, or only one of them?
Yes.
In Push mode the SEPM pushes updates down to the clients.
In Pull mode the clients initiate communication and pull down updates.