another Port sniffer#12

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andrewsan13 wants to merge 14 commits intokottans:masterfrom

andrewsan13:port-sniffer

Commits on Nov 9, 2019

Commits on Nov 10, 2019

rename TCP_PORT to tcp_port, cause uppercase is the name for global var
andrewsan13
committed

Commits on Nov 12, 2019

add start of string ^ and end of string $ into regex :)
andrewsan13
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add exception for socket.timeout if data cannot be safe in 300ms
andrewsan13
committed

Commits on Nov 13, 2019

add check, for each number in IP address should be less than 256
andrewsan13
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moved instructions that do not raise an exception in the else block
andrewsan13
committed