Getting Runtime Error when trying to use Serial to communicate to Arduino

[Juan_Antonio]

@b8301131

to solve this problem

This works for me on Android 9:

Serial OTG. Arduino CH340. FTDI. rkl099's Extension

7.- Testing version 2022-10-19. p10A_OTG_Add.aia (190.4 KB) https://github.com/rkl099/Appinventor_Debug Arduino UNO (CH340). Cable OTG. Cable USB. [otg17b] Settings / Additional settings / OTG / Enable OTG. [otg26] Android 9. MIT Companion and installed. [otg_3] [otg_4] Arduino UNO (CH340) String a; String b; int c; int d; void setup() { Serial.begin(9600); } void loop() { if(Serial.available()) { a = Serial.readStringUntil(','); b = Serial.readStringUntil('\n'…