Yamm module embed a server-side scheduler which will allow you to send scheduled synchronization orders to clients.
This scheduler is implemented using a DataSync job (may be a simple cron run in future, but always prefer the DataSync job if you can use it).
The job is simple, it sends a push order to all registered clients that have are in activated state.

To use it, enable the Yamm scheduler module, on the server Drupal instance.
To schedule the job execution, refers to DataSync module documentation on how to set up a scheduled job.