Question #165293 on rohc changed:
https://answers.launchpad.net/rohc/+question/165293
Status: Open => Answered
Didier Barvaux proposed the following answer:
Hello,
There are 5 profiles implemented yet:
- Uncompressed
- IP-only
- IP/UDP
- IP/UDP-Lite
- IP/UDP/RTP
You're right, the IP/ESP profile is not implemented yet.
A good start would be:
- Read the main part of RFC 3095 to fully understand how the ROHC protocol
works in general.
- Read the parts that describes the ESP profile in RFC 3095. The ESP profile
is very similar to the UDP one. You may ask question on the mailing list.
- Get familiar the ROHC library (build it, install it, use it in a small
program).
- Read the code of the Uncompressed profile (compression and decompression
parts). Try to see how the different functions are called by the core of the
library. The Uncompressed profile is the simpliest one.
- Read the code of the UDP profile (compression and decompression parts). The
ESP profile is very similar to the UDP one.
- Create a PCAP capture of ESP packets you want to compress. Try to write the
ESP profile that compresses them and then decompresses them. The decompressed
packets must be strictly identical to the original ones. The non-regression
tool present in the test/non_regression/ directory in the sources of the
library may help you in that task.
Start with the code of the trunk, not the 1.2.x or 1.3.x branches. The
trunk is more up-to-date.
If you got questions about the ROHC protocol or the ROHC library, send
your question to the mailing list.
Regards,
Didier
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