how to modify pcap file for Additional Information in packet

I have one Pcap File which consist of Some Information. ------------------------------------------------------- I need to modify the data in the file. Example: As you can see There are details of packets and in **Additional Record** section I have TXT value

=Room 110

Now please help me to change the TXT value > Example: from

: fn=Room 110

to

: fn=Room 1234

## Things I have Done So Far ## ### 1. Used Scapy and Hex Editor To change the Metadata. ### with Scapy I have done changes like Changing Destination address or mac address and ports. But unable to change the TXT records with scapy. With Hex I am able to change TXT value by converting the String to hex, but I face challenge in different length. > Example: I can Chnage

: fn=Room 110

to

: fn=Room 123

> But Can't Change from

: fn=Room 110

to

: fn=Room 1234

In this case, the generated pcap gets invalid. #### Here is a sample working Screenshot Using Python #### This code Changes The Destination Mac, Source IP and TXT=Room And That TXT value is being modified by Checking the HEX Value before and after the "TXT: fn=Room" of the packet. ### Any help regarding this Issue is very very appreciated ### Thank you.