|Re: IP Header for BER Message [message #1793490 is a reply to message #1793403]
||Thu, 09 August 2018 06:45
|| Elemer Lelik
Registered: January 2015
Protocols are embedded one into another as Matrioshka dolls:
The IP payload is usually a transport layer protocol , TCP or UDP, which carries a higher layer protocol, in your case GCP.
In TTCN-3 you have to do decoding layer by layer: assuming that you start from IP ( that is your test port receives structured IP messages) , first you will have to decode the TCP ( or UDP ) layer; now decoding TCP also assumes that you want to handle the TCP protocol from that layer which is not practical; for UDP this is not a problem.
From the structured UDP (or TCP ) message obtained you can extract the GCP payload and decode it with the BER codec.
This leads to the following architecture:
some IP test port that handles structured IP messages ;
here , a combination of the LANL2 test port and the IP protocol module (with teh associated RAW codec) can be used ( see product list on https://github.com/eclipse/titan.core)
in the next step , the TCP/UDP messages can be (binary RAW) decoded/encoded with the TCP/UDP protocol module
Finally , the extracted GCP payload is transferred to the BER codec
On every protocol level, the headers can be analyzed and verified as needed.
To bridge the gap between distant protocol layers its practical to use the translation port feature that has been described in several posts.
Now I understand you have an existing framework. The exact answer to your question depends on how this is structured already. If you have access to IP messages than just simply decode them along the way using the IP protocol module.
I hope this helps
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[Updated on: Thu, 09 August 2018 07:23]
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