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After a year of testing, my IoT project come to an end. It operates mainly on RPI0 using Python code, and ESP32 using MicroPython code, all connected using MQTT protocol running on RPI3.

Now i;m trying to build a basic App for my iPhone to control all those switches- today I'm using a very primitive MQTT App to type action and status command, and I'm looking for a more GUI kind of App.

Can anyone refer for a easy, preferably free ?