PI nanomsg hangs if the corresponding switch crashes about ptf HOT 2 CLOSED

It's not supported by PTF currently, but I would recommend the gRPC service for injecting packets (https://github.com/p4lang/behavioral-model/blob/main/services/p4/bm/dataplane_interface.proto), instead of the nanomsg socket. You could consider adding that support to PTF...

The nanomsg stuff we use doesn't seem to be actively maintained any more. There are new implementations (both for the core library and the Python module). I don't know if using these would help.

I could think of the following workaround (not guaranteed to work): force delete the socket files after you detect that simple_switch_grpc has crashed. I assume this is an unplanned crash (e.g. segfault), and not a signal we could trap in bmv2 to close the socket before exiting.

from ptf.

Thanks, will try to give the hack a shot.

from ptf.