How can I add any field in wireshark in order to analyse packet

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Thank you so much for your kind reply. I am doing project in networking in contiki operating system. I am using wireshark to analyse packet. As we know in wireshark we will get source address, destination address, payload length etc things. Now I want to add a new field (parameter or variable) same as source address e.g ABC : 12. I will write code for value. But I want to how to add that parameter in wireshark? How to modify wireshark for that value. Currently, I am using wireshark 2.2.6. Can you please help me? Thanks in advance.

Is the field that you want to add an existing field in an already dissected protocol? If so, you can select that field in the packet details tree, right click it and select "Apply as Column".

If your field is not currently dissected, then you will need to add a dissector. You can use any of the approaches in my presentation.

I want to add one more new field. But I didn't understand how to add dissector and what is dissector ? Thanks in advance.

As I tried to explain above, a dissector is a bit of code that knows how to "interpret" the bytes in the packet and adds them to the Wireshark display.

If your data is already (partially) dissected by Wireshark, then you will need to modify the existing dissector. If this is a new protocol, not already handled by Wireshark, then you will need to write a new dissector.

Can you post your capture file (as a link to the file on an external file sharing site, e.g. CloudShark, Google Drive, DropBox etc.) with details of how you would like it displayed?

I added this link https://www.dropbox.com/s/ua5yx019dkt.... Here I underlined some text. In the similar way I want to add text, which will be seen in wireshark. Can you please help me? Ok I will search for dissector.