Java xmodem file transfer

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The world's dumbest dumb terminal. This is the first byte that indicates that the file transfer is ready to start. If the recipient takes too long or an error occurs, the sender will stop waiting or "Time Out". File transfers will restart when they expired. NAK is also sent if the recipient does not receive a valid package within ten seconds while waiting for data due to a lack of EOT character. Assume that the packet number sent is the same as the actual packet number, i.

In the event of a discrepancy, send a CAN byte to cancel the transfer. The packet's checksum is calculated after retrieval and compares with that received from the sender at the end of the package. If the situation is not satisfactory, the NAK byte is sent, signifying that the transmitter will re-send the byte. If the sender sends another EOT immediately after that, the recipient sends the ACK byte, and the transfer is complete.

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