I have a SmartSolar charge controller and it is working. What is not working is connecting to a device via bluetooth. On both the iPhone (12) and the iPad the apps have been uninstalled and reinstalled. They are up to date. Using only one device at a time, I can see the controller in the app. What I can't see is the controller under the bluetooth settings. I have disconnected the controller from the battery and solar panels. I am 12" away from the controller. When I try to connect in the app it will not pair because the controller is not available via bluetooth. What is wrong?