I have added support for Physicaloid library stopbits in SerialOTG.
StopBits(n) and n=StopBits. Value n 0=>1, 1=>1.5, 2=>2 stopbits .
Please test and report what adapter you are using (or selected driver).
(Adapter type can be tested with a Linux system and terminal cmd dmesg) The extension can be found at GitHub - rkl099/Appinventor_Debug: Debug versions: SerialOTG Add support for ATTINY85+Stopbits, Modbus add 32b reg R
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