Bluetooth Motor Control App

I need a straightforward mobile application that runs on both iOS and Android and pairs over Bluetooth with a small motor-driven mechanism. Once connected, the app will send simple commands to spin the motor clockwise to enlarge a box and anticlockwise to shrink it... (Budget: ₹12500 - ₹37500 INR, Jobs: Android, Android SDK, Arduino, Bluetooth, Flutter, iOS, iPhone, Mobile App Development)