Library error: was not declared in this scope drive me Nuts(Kinda solved)

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In your cpp file you implement the function serialEvent1(), which is global namespace. However, the Gestion_de_donee() function is of namespace Uart_WIFI. You must creat an object of that class to use the function. Or you make the function static and call it with Uart_WIFI::Gestion_de_donnee().

The same for the functions serialEvent2 and 3.