Fix issue with remote address lookup on the UPD6EndpointAdress object…

[nilsMontenegro]

… when using IPv6. The remote address is located in the sockaddr.

[chrysn]

Thanks for fixing this. It should actually be done differently, but that's a more generic issue now tracked in #40, and your fix does do the job until the greater scheme is figured out.

(Out of curiosity: are you using aiocoap for multicast requests? (I couldn't figure out any other situation that would trigger that code path). Support for that so far is rather rudimentary and not covered by tests yet, I'd be interested in hearing your experience.)

[nilsMontenegro]

Hi, thanks for pulling this in.
I think the code is triggered because of IPv6 and not because of mulitcast.
We don't have multitast. We have a bluetooth low energy (BLE) device connected to the PC.
They communicate via 6lowpan, a kind of IPv6 over BLE.
The PC uses AIOCOAP as server and the BLE-kit holds the coap client with another implementation.