Makeblock dev team has always been improving our support for the App Inventor. We just released the 1.9 version.
Changes:
- Uses Bluetooth 4.0 (BLE), which simplifies the connecting experience. Now you may connect your mBot with even only one button.
- Added support for 9g mini servo
- Now sensor values are read through events, easier for programming.
try it out at:
http://learn.makeblock.com/en/use-mbot-with-app-inventor/