[lwip-devel] [bug #2595] loopif results in NULL reference for incoming TCP packets

[Simon Goldschmidt]

Follow-up Comment #6, bug #2595 (project lwip):

>You could test for ETHARP_TCPIP_INPUT - that's what controls the presence of
tcpip_input.

Unfortunately, I think I can't: first it could be either ETHARP_TCPIP_INPUT
or ETHARP_TCPIP_ETHINPUT, second, this does not make sure the user is really
using the tcpip_thread and not using the polling mode and simply not
deactivating the above defines.

I think NO_SYS could be more like it (because it does not make sense to use
tcpip_thread() if sys_mbox_fetch() is a null-define...
But still, it is not explicitly documented (I think), that NO_SYS=1 means
raw-API/polling only and NO_SYS=0 means netconn/socket-API & tcpip_thread().

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