Winsoft ComPort for Android USB 3.0 Full Source
Delphi and C++ Builder serial communication library for USB connected devices for Android.
uses usb-serial-for-android library
supports FT232R, CDC/ACM (Arduino Uno), CP2102 and CH34x chips
no special root access privileges needed
available for Delphi/C++ Builder XE6 - 10.3
source code included in registered version
royalty free distribution in applications