An example to set MQTT-Port and MQTT-Feeds from Webportal
V2021.10.16 I had invested some time in this example because I couldn't find any suitable examples in netz. Now all makers should benefit from it ...
testet whit ESP8266 on Platformio ... Espressif 8266 (3.2.0) > WeMos D1 R2 and mini
Lib: https://github.com/prampec/IotWebConf V3.0.2 ==> Parameter transfer work also whit Wifimanager
https://github.com/adafruit/Adafruit_MQTT_Library V2.4.2 https://github.com/bblanchon/ArduinoJson V6.18.3 (only for set tests over USB (Json-File))
works whit "Adafruit IO"
enjoy!!