Simusolar was trying to get the PAYGO concept to work across all their products, like water pumps, but found their products couldn’t “communicate” using the same protocol.
For example, when a customer failed to pay on time, it would be much easier for Simusolar to remotely control the products in the same standard way, in order to turn them off or on. AirLink was created to standardize communication operations for Simusolar, but could work for many other companies as well.
Bluetooth is available for communication in proximity, and can be leveraged to make things much easier.