...
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Client Server Action
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<ESC "i"> Request for File CRC-32CRC32
<FileName><ESC "Z"> -> waiting
Calculating CRC-32CRC32 of file...
<ESC "N">
<CRC-32><CRC32> HEXADECIMAL ASCII string of CRC-32CRC32, for example "42ECA515"
waiting <- <ESC "Z"> File found.
or
waiting <- <ESC "Z"> File not found.
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...