TCPSocket connection close by remote end reported as device error

[infinnovation-dev]

Using a test program (an echo server), I connect from a Linux PC and send a stream of data:

nc $K64F_IP_ADDRESS 7 < /dev/zero > /dev/null

and then kill the nc process with a Ctrl-C

The board gets an error code -3011 NSAPI_ERROR_DEVICE_ERROR "failure interfacing with the network procesor" (sic). This can come either from the recv() call or from the send() call - I guess depending on the timing of the event relative to the send/recv loop.

I would expect either a 0 return from recv() to indicate end of stream; or some other error from send(), maybe NSAPI_ERROR_NO_CONNECTION.

[infinnovation-dev]

The underlying error in the lwip library is ERR_RST

[geky]

Thanks for reporting this, looks like it was just a short-sight in handing lwip's error codes:
https://github.com/ARMmbed/mbed-os/blob/master/features/net/FEATURE_IPV4/lwip-interface/lwip_stack.c#L213