Tutorial 1:What is MQTT? IoT Devices Communication.----https://microdigisoft.com/what-is-mqtt-iot-devices-communication/#google_vignette Tutorial 2: ESP8266 NodeMCU ...
Tutorial 1: ESP32 Wi-Fi and MQTT Manager using EEPROM----https://microdigisoft.com/esp32-wi-fi-and-mqtt-manager-using-eeprom/ Tutorial 2: ESP32-TTGO T-Call SIM800L ...