Teach test::Proxy to send packets in reverse direction

[gavv]

test::Proxy is a class that we use in integration tests for C API.

Proxy is inserted between sender and receiver. Instead of connecting sender to receiver, we connect sender to proxy and proxy to receiver. Mostly, proxy just forwards packets as is and calculates some metrics, but it can also simulate network losses by dropping some packets.

Currently Proxy supports two uni-directional endpoints: one for source packets (audio packets sent from sender to receiver) and another for repair packets (redundancy packets sent from sender to receiver). See docs.

We want to teach Proxy to support optional endpoint for control packets. This endpoint should be bidirectional, i.e. sender sends control packets to receiver (via proxy), and receiver sends control packets to sender (via proxy).

This would allow us to improve tests for metrics.

[kiranlahiri]

Hi! I would like to work on this!

[gavv]

@kiranlahiri Hi, sorry for late reply. Please let me know if you're still interested.

[kiranlahiri]

No worries. Yes, I am still interested!

[gavv]

You're welcome then, let me know if you have any questions.

[gavv]

@kiranlahiri Feel free to ping me if you'll decide to work on this. For now, unassigning the issue so that someone could pick it up.