a-lunev opened a new pull request #5252:
URL: https://github.com/apache/incubator-nuttx/pull/5252


   ## Summary
   
   Do not use pvconn argument to get the TCP connection pointer because pvconn 
is normally NULL for some events like NETDEV_DOWN. Instead, the TCP connection 
pointer can be reliably obtained from the corresponding TCP socket.
   
   This PR is related to PR #2257.
   
   ## Impact
   
   TCP
   
   ## Testing
   
   Build NuttX:
   ```
   $ ./tools/configure.sh -l sim:tcpblaster
   $ make menuconfig
   (enable CONFIG_DEBUG_ASSERTIONS,
   enable / disable CONFIG_NETUTILS_NETCAT_SENDFILE,
   enable / disable CONFIG_NET_TCP_WRITE_BUFFERS)
   $ make
   ```
   Enable TUN/TAP on Linux host:
   ```
   $ sudo setcap cap_net_admin+ep ./nuttx
   $ sudo ./tools/simhostroute.sh wlan0 on
   ```
   Run netcat server on Linux host:
   `$ netcat -l -p 31337`
   
   Run NuttX on Linux host:
   ```
   $ ./nuttx
   NuttShell (NSH) NuttX-10.2.0
   nsh> ifconfig eth0 10.0.1.2
   nsh> ifup eth0
   ifup eth0...OK
   nsh> dd if=/dev/zero of=/tmp/test.bin count=1000
   nsh> netcat LINUX_HOST_IP_ADDRESS 31337 /tmp/test.bin &
   nsh> ifdown eth0
   sendfile_eventhandler: WARNING: Lost connection
   ifdown eth0...OK
   nsh> sendfile error: Error 128
   sendfile error
   nsh>
   nsh> poweroff
   ```
   
   Disable TUN/TAP on Linux host:
   `$ sudo ./tools/simhostroute.sh wlan0 off`


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