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fixeria has posted comments on this change. ( https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/33072 )

Change subject: BTS_Tests: add TC_data_rtp_tch* for CSD ......................................................................

Patch Set 3:

(1 comment)

This change is ready for review.

Commit Message:

https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/33072/comment/1b112452_e0fc1... PS1, Line 10: temporarily

For now I am trying to get the basic stuff to work. […]

Now that osmo-bts implements the rate adaptation, we cannot expect whatever we send on L1CTL to show up on the RTP (and vice versa). Implementing the rate adaptation in TTCN-3 would require more work and time, so instead of doing that I quickly implemented the loopback mode for the `RTP_Emulation` component.

As the name suggests, in this mode all RTP PDUs received by the emulation component are simply echoed back. This allows us verifying the scheduling by sending something on Uplink and expecting the same payload on Downlink.