Server to Server communication

Hi,
what's the best way to send data between xymon servers when http is not available. Our network will be very restricted and we can only send files through.
I have setup a centralized master xymon server ready to go just trying to find the best solution of getting the data to it from the child servers. All I have found so far is creating pre generated report for the master server to read.

Regards,
Trev