SerialTest app
SerialTest is Connectivity tool that is open source under the GPL-3.0-only license. A versatile test tool running on Windows/Linux/Android.Works as data transceiver/realtime plotter/shortcut/file transceiver.
Supports serial port, Bluetooth SPP client/server, Bluetooth LE client, TCP client/server, UDP.
(Serial port is not supported on Android now)
(You can download/build the PC version in https://github.com/wh201906/SerialTest)