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[FW1] Inspect code?



We have a custom application that requires opening a TCP connection on a
specific port.

After the connection is opened, we need to see a data packet arrive that
must match a general pattern:  the first character must be in a certain
range of ascii characters, followed by a specific (non-changing) ascii
character/byte value.

Can anyone tell me if it would be practical to write inspect code to check
for this?  And where I would start reading?



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