How can I monitor the traffic on a single port?

How can I monitor the traffic on a single port?

I am developing a python messenger client but I feel this is more targeted to superuser than StackOverflow. My server application seems not to get the data sent from time to time, so I want to see what exactly is being sent each time over a specific port such as 42222. I tried wireshark but I am having trouble filtering data on this port specifically.

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bert [Entry]

"Your WireShark solution will work, you just need to use the correct filter:

port 42222

You may want to read the WireShark wiki on capture filters, there is an abundance of useful filters you can use."