Attention is currently required from: laforge, lynxis lazus, pespin.

fixeria has posted comments on this change by pespin. ( 
https://gerrit.osmocom.org/c/erlang/osmo-s1gw/+/37924?usp=email )

Change subject: s1ap_proxy: Support replying errors
......................................................................


Patch Set 6:

(2 comments)

Patchset:

PS2:
> So what is the status here? Why do we have no unit nor functional/integration 
> tests for this patch?  […]
Done. I added a unit test and also developed a TTCN-3 testcase.


Patchset:

PS4:
> Please do whatever you deem necessary so it can finally get merged.

I ended up extending the idea and reworking the patch significantly:

* `s1ap_proxy:proc` (former `s1ap_proxy:handle_pdu`) now returns a forwarding 
action:
 * `{forward, binary()}` -- forward to the other peer,
 * `{reply, binary()}` -- reply to the sending peer.
* I don't see a use case for forwarding something and replying to the sending 
peer at the same time, so this is no longer possible. We can re-introduce this 
if needed in form of `[{forward, binary()}, {reply, binary()}]`, but for now 
let's avoid additional complexity without the need for such functionality.
* `handle_pdu/3` becomes `handle_pdu/2` and does not accept the raw binary 
anymore, it can simply return `forward` alone to indicate the the binary blob 
should be forwarded as-is (handled in `proc/2`).



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