I have both a SmartShunt and SmartSolar MPPT on my boat. I can get both to connect to my wife's iPhone using the default PIN code of 0000. But, neither of the devices will connect to my Android Phone (OnePlus 12) or Android Tablet (Samsung). The phone is new but the tablet is 4 years old. Both the phone and tablet "see" the shunt and mppt as available devices with which to pair, but connection goes to about 80% and then fails every time. Once they connected to my wife's iPhone they both updated their software, but the update did not help create an Android connection. I also have a Vesper Cortex AIS installed and that is refusing to connect to everything I try, whether Apple or Android.