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Welcome to B4X forum!
B4X is a set of simple and powerful cross platform RAD tools:
- B4A (free) - Android development
- B4J (free) - Desktop and Server development
- B4i - iOS development
- B4R (free) - Arduino, ESP8266 and ESP32 development
Android Question how to control arduino from my app via internet or wifi
- Thread starter adnan551
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There are many options. A nice and simple one is to use CloudMQTT: https://www.b4x.com/android/forum/threads/mqtt.65669/#content