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Adding Bluetooth to Your Arduino Project with an HC-05 or HC-06 Bluetooth Module
Send a message from smartphone to Arduino
Send a message from Arduino to smartphone
Bluetooth texting with arduino
Arduino LoRa Free SMS over Long distance without GSM Network, Arduino send SMS | LoRa Bluetooth
Arduino Based Wireless notice board using Bluetooth (Android app) in Tamil
453 Use your Arduino and ESP32/ESP8266 from your Smartphone. No Cloud! (RemoteXY)
Simple Bluetooth Chat in Python