I had an alarm system in my trailer with GPS and cell phone paging but it self destructed. I'm left with the motion detector, magnetic reed switches on both doors, an alarm, and a keyed on/off switch. But no brain to run it.
I want to put this already paid for equipment back into use without going the way of the $1000+ systems that are pretty much all I can find on the internet. Any advice would be greatly appreciated.
Alternatively I'd consider an all new system but for now I'd like to forgo the paging and GPS route.
(BTW, I added an independent GPS tracker that works reasonably well for not much money.)