While that might be interesting to some, to me it is over-complicating things. If I wanted to do complete custom programming, I would program the Android myself. I don't want to have to send text from the device to program the phone
As I said, I want a remote button interface that sends short sequences (typically 1 character) to the microprocessor at a distance. At the moment, I have one button that I want two different texts sent (one for the button being touched on the screen, and one for it being released), and several toggles where I don't need both up/down, just button being pressed. I want to have as little interaction with the phone as possible, and I need to be able to do it one handed on the phone. Typing in text is 4 different key motions on different parts of the phone, and I would not be able to do it while holding something else in my other hand. Yes, I could do this with a second microprocessor, but that requires another set of batteries, etc.