Problem with CoAP Examples based on LWIP stack (no suitable source address was found)

RE: Problem with CoAP Examples based on LWIP stack (no suitable source address was found)

Stian Røed Hafskjold — Fri, 29 May 2020 09:13:43 GMT

No worries. I'm glad it worked out!

RE: Problem with CoAP Examples based on LWIP stack (no suitable source address was found)

Michael Kreher — Thu, 28 May 2020 21:47:52 GMT

Hi Stian,

as you suggested I used 2001:db8::1/64 as prefix and now it works fine :-)

The problem was that I used the prefix fd00:a::/64 instead of 2001:db8::/64.

IPv6 is pretty new for me, so my mistake.

Thanks for your help!

RE: Problem with CoAP Examples based on LWIP stack (no suitable source address was found)

Stian Røed Hafskjold — Thu, 28 May 2020 12:01:57 GMT

Hi, most likely the lwIP stack does not get a global prefix. Have you set up radvd correctly and added the global prefix to the bt0 interface? From the output of ifconfig it seems like it's missing the global prefix. It has to be added to the bt0 interface each time you reconnect.

f.ex:

ifconfig -a bt0 add 2001:db8::1/64

Also wireshark logs help a lot in debugging this. It's a great tool, I would recommend using that for debugging.