ACKs not sent after change in IP address

[wesmwoo]

I'm running some experiments with aioquic, looking at how mobility across networks is handled by the QUIC connection migration functionality.

One of the minimal ASGI client/server applications that I've written emulates adaptive bit rate video streaming, and I've noticed that when I change IP addresses of the client (by switching from WiFi to a cellular hotspot), the client stops sending packets to the server (as seen in wireshark). This is strange because I at least expect ACKs to be sent by the client once the max ACK delay is reached (as described in the standards here here).

Is this behavior is due to a missing implementation of ACK behavior, or is something else going on? Or could someone point me to where in the code the ACK behavior is implemented, so I can do some digging myself?

Thanks in advance for any help, and this great project!

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