How to add a payload to the packet?

[thekioskman]

I tried to add a payload to the TCP packet by just increasing the packet size. But then when I tried to test this against PA2 test cases it failed every test case. I can't figure out why this is happening when I add an empty payload.

[Pusnow]

How do you resize the packets?

For now, you can create a new packet and copy original packet's contents to new one.
I admit that it is little inconvenient to resize packets. I'll add an easy method for resizing soon.

[thekioskman]

I just changed the input size to the packet constructor, and then kept the same code for writing the header into the packet

[Pusnow]

Did you calculate checksum correctly?

Try turning on checksum verification in Wireshark: https://wiki.wireshark.org/TCP_Checksum_Verification .

[Pusnow]

I'm not sure if this relates to you, but now you can increase the size of internal buffer by using setSize.
You can git pull or re-download KENS from Github to use this new feature.