Botspine

The easiest way to connect electronics to your phone. BotSpine lets you control robots and read sensors with your phone, without programming firmware. It acts like a spinal cord for robotics.
you can program the botspine board with easy basic code.
see here :
https://github.com/kaiateic/BotSpine/wiki

The BotSpine app sends simple command strings to the BotSpine board, where the firmware interprets and executes them.
The app is open source and the code, as well as instructions for customization.