I've had a
bluetooth virtual keyboard for years.
I originally played with it with Palm devices. There is an
Android driver, but that's for Android 2.x. It crashes repeatedly on my Android 5 and 6 devices (mainly a Nexus 7 2012 tablet) - every few seconds you get a "Stopped" report. From what I read, it doesn't need a driver if the device supports HID. So far, I have not seen any characters on screen on Android (it worked OK on Palm, of course).
I'm pretty-much at the edge of my knowledge. Any suggestions on directions to go in trying to get this working? It's partly just for fun...
Oh, and in its configuration it has a box for "address", presumably the keyboard address. That's blank. It has a Scan feature, but nothing happens. Would it be the MAC address, and how would I get that, given that the keyboard doesn't have it printed on?