[lwip-users] using loopback

[Ben Bobbitt]

I’m trying to use a loopback mechanism on a periodic basis as a way of checking that an interface is still up and running. 

 

It appears that loopback capability is included in the loopif.c module with the LWIP_HAVE_LOOPIF option in opt.h set... however,  I’m not clear on how one would actually use that.  Does the netif that you want to periodically test with a loopback message have to be initialized under a new model?   

 

I’m using the netconn api, and I simply want to have another thread periodically send a ping to the port that another thread is listening to – but since it’s a blocking read, I can’t really test that the thread is still up unless he receives data.  Hopefully that makes sense. 

 

Thanks.

 

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