zmtx and zmrz implement the ZMODEM error correcting protocol used to send/receive files over a dial-in serial port. And they do one thing and only one thing -- transmit files. They don't do file conversions, they don't do remote commands, or any of that other stuff. Note, zmtx-zmrx is not derived from Chuck Forsberg's rzsz package. The only restriction is that you will not use this software for commercial purposes. (commercial licenses are available contact the author for info)
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