HedongGao opened a new pull request, #3285:
URL: https://github.com/apache/nuttx-apps/pull/3285

   
   ## Summary
   
   Ref: https://man7.org/linux/man-pages/man7/packet.7.html
   
   We should either set protocal when creating socket or binding, otherwise
   we cannot capture any packet.
   
   ## Impact
   
   The netpkt tool will receive all types of Ethernet messages.
   ## Testing
   
   Open the compilation option CONFIG_EXAMPLES_NETPKT and set up the SIM 
environment. Use `netpkt - vr` to receive messages at the SIM and send messages 
to the SIM at the host. Check the reception of SIM terminal. The result 
verifies that netpkt receives normally.
   
   
   


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