Learn how to establish full two-way communication with IoT projects from anywhere in the world in this comprehensive Arduino WiFi tutorial. Create a SQL database as a central hub for 'things' to send and receive information. Dive into PHP code to enable ESP communication with the database and build a simple web interface. Follow along with step-by-step instructions on setting up the database, implementing PHP code, and creating an Arduino sketch. Explore practical applications like querying data, sending text messages, and controlling devices remotely. Access provided resources including PHP code, Arduino code, and ESP8266 firmware for hands-on implementation. Perfect for makers and IoT enthusiasts looking to expand their skills in creating globally accessible projects.