add DTR/RTS functions to the test suite
add DTR/RTS functions to the test suite

moteus/librs232,moteus/librs232,jjonethal/librs232,ynezz/librs232,ynezz/librs232,jjonethal/librs232,1linux/librs232,jjonethal/librs232,1linux/librs232,ynezz/librs232,moteus/librs232,1linux/librs232