Simple code to communicate with an App on your Android phone (MIT App Inventor) to an ESP32 (Arduino). Works on Android Phones only. Please make sure that your ESP32 has integrated Bluetooth. Device used for coding: ESP32-WROOM-32D. Youtube explanation is available (see below).

Code for bi-directional communication between ESP32 and Phone (with MIT App Inventor)

This Code provides an example of how to send values larger than 256 between ESP32 and MIT App Inventor and a simple protocol is introduced to send over an ID with an associated value. This is practical for sending over control and/or sensor values. Please make sure that your ESP32 has integrated Bluetooth. Device used for coding: ESP32-WROOM-32D. Youtube explanation is available (see description).

MoThunderz Bluetooth control app