Rebooting the machine via some sort of a signal

I have pfSense installed on a small desktop PC. I also have a tool that monitors status of the box - if it's responsive or not while I'm outside of the office. Now when for some reason the box fails to function properly (i.e. it doesn't successfully boot after regular reboot) or it just simply stops working - is there a way to send some sort of a signal to it so that it reboots itself? Don't know if this is possible but I thought I might as well ask.
 
This question is related to FreeBSD, I have only mentioned pfsense to explain the purpose of the box.
 
Although pfSense uses FreeBSD the way it's configured is completely different. So, what works on FreeBSD may not work on pfSense.
 
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