https://evothings.com/control-an-led-using-hm-10-ble-module-an-arduino-and-a-mobile-app/
Control an Arduino via the HM-10 BLE module, from a mobile app on your smartphone was last modified: May 19th, 2018 by
Control an Arduino via the HM-10 BLE module, from a mobile app on your smartphone
Jovan Stosic