[riot-notifications] [RIOT-OS/RIOT] examples/emcute: set GNRC_NETIF_SINGLE (#14064)

Martine Lenders notifications at github.com
Tue May 12 16:23:55 CEST 2020



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### Contribution description
The shell command offers no capability to parse the outgoing network interface in the gateway host, so link-local addresses are not usable with this example without this patch.
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### Testing procedure
Compile and run `examples/emcute_mqttsn` on `native` on `tap0`. In a second terminal sniff on `tap0` using `tshark`:

```sh
tshark -i tap0
```

In the RIOT application now type

```
con fe80::1
```

and hit enter. Nothing will happen, but in the sniffer you will see neighbor solicitations being sent, probing for `fe80::1`, signifying, that the packet is indeed trying to be sent.

```
[…]
    8 5.942474831 fe80::e0bc:7dff:fecb:f550 → ff02::1:ff00:1 ICMPv6 86 Neighbor Solicitation for fe80::1 from e2:bc:7d:cb:f5:50
    9 6.942905893 fe80::e0bc:7dff:fecb:f550 → ff02::1:ff00:1 ICMPv6 86 Neighbor Solicitation for fe80::1 from e2:bc:7d:cb:f5:50
   10 7.943482685 fe80::e0bc:7dff:fecb:f550 → ff02::1:ff00:1 ICMPv6 86 Neighbor Solicitation for fe80::1 from e2:bc:7d:cb:f5:50
```

Without this patch it won't work.

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### Issues/PRs references
See https://github.com/RIOT-OS/RIOT/issues/14035#issuecomment-627363581.
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You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/14064

-- Commit Summary --

  * examples/emcute: set GNRC_NETIF_SINGLE

-- File Changes --

    M examples/emcute_mqttsn/Makefile (3)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/14064.patch
https://github.com/RIOT-OS/RIOT/pull/14064.diff

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