-s<serialport> eg -s/dev/ttyS0 normally necessary
-w<repeatdelay> usleep; 0 = no usleep; default is -1 = don't repeat at all
-i<iterations> default is 0 = infinite; -1 means don't repeat
-s<serialport> eg -s/dev/ttyS0 normally necessary
-w<repeatdelay> usleep; 0 = no usleep; default is -1 = don't repeat at all
-i<iterations> default is 0 = infinite; -1 means don't repeat