I want to have an interface between my Arduino board (uno R3) and my ardroid phone using use serial communication , I tried these extension ( [Free] Arduino USB Serial Extension - #ThunkableClassicExtensions - Thunkable Community) but I can’t make it work , so if anyone have example for it , even for the block code or even another method
I think this post on the same topic might help you:
I tried it still not working 
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rewrite code in kodular using internal component of Kodular Eagle got an error. mycode works on appybuilder.
try one by one service or wait some day ill also working on same project