forked from espressif/esp-idf
feat(lwip): support cloning pbuf_ref when ipv6 forwarding; add unit tests
[LWIP submodule changes]: git log --oneline 0a44efa1..ebabd6d7 Detailed description of the changes: - ip6: add some unit test cases for ip6 forwarding (esp-lwip@ebabd6d7) - ip6: clone the buf when forwarding a PBUF_REF packet (esp-lwip@adcd330e)
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