Laczen opened a new pull request, #15877:
URL: https://github.com/apache/nuttx/pull/15877

   Update the handling of tcp packets over sixlowpan. `tcp_ipv6_input()` can 
update the dev->d_iob, so use this to send the response.
   
   ## Summary
   
   When using tcp over sixlowpan (e.g. for telnet) the handling of packets 
trough `tcp_ipv6_input()` can modify `dev->d_iob`. The PR makes sure that the 
correct `dev->d_iob` is used as returned packets. 
   
   ## Impact
   
   Allows using tcp over sixlowpan, e.g. telnet over sixlowpan. No impact on 
build system or other parts.
   
   ## Testing
   
   Verified on esp32 using espnow as packet radio with telnetd and telnet.


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