I also use the Control By Web relay (X-WR-4R3-I) to turn off 24v to the bay meters and toggle the power to the change machines to reset them. I use (X-408) to monitor the status of everything like power outages, water leaks,
changer - out of service, bay power tripped, and
door open/closed. It runs through an
app on your phone that you can customize to fit your needs and then set your notifications accordingly. I had previously used, and still do use a few sensors, from a company called Monnit. It’s a wireless platform that worked well, but has a little lag time in the ability to turn the bay power off.