The site has no software documentation on the device.
Here's an easy experiment to try with the device, if you have one,
based on the idea that Android is descended from unix and
unix devices respond to file names and file operations .
Pull in a File component, and write this text to file
'/dev/ttyMT2' : 'Hello World\r\n'
and see if it prints anything.
I give it only a 1 in 4 chance of working, but it's an easy test.
ABG