Bill Pretty, who specializes in security, wrote a detailed project account on Building a Home Security System with BeagleBone. The book includes a compact overview of the components, wiring and secure implementation of a DIY Internet-connected intrusion alarm, and features a chapter on our relay service:
Under normal circumstances, your firewall or mobile router blocks the access to your alarm system. In this case, Yaler acts as a secure "man in the middle", who handles two-way communication between your web client and your alarm system.
Nicely put. And thanks a lot for using Yaler.