Communication between two Home Assistans on an interval


I have the need of having two HASS installations communicating with eachother, however since my internet connection on one side are capped and I need to keep the data transferred at a minimum, I only want the data to be sent every 30 minutes or so.

The MQTT Eventstream and Statestream seems to fit my purposes, but I can’t find a way to set intervals or schedule ut

Does anyone has any ideas how to do that, or have any other suggestions on how to have to HASS instances communicating on an interval?