* set up magellan printer and scale.
 * 1, need to configure the device to the desired baudrate and simbelogy for the barcode scaner.
 * setup and test , ean8, ean13, code 39, interleft 2of5, make sure turn off global label id, for the one have check digit need to read, and for the one have leading zero need to read.
 * 2, after that run netserial on the host machine with the right baudrate and port
 * 3, add scale printer tcp:hostname:port
 * 4, teaad -> serial barcode prefix S08, use single cable mode, and scale_port to the scale printer