[riot-notifications] [RIOT-OS/RIOT] cpu/esp*: esp_now and esp_wifi cleanup (#10929)

Gunar Schorcht notifications at github.com
Tue Jul 30 13:59:48 CEST 2019

> Just as I stepped on it, I noticed the
> ```
> # Might need more than the default of 2 addresses.
> ```
> Could this be causing issue depending if the wifi network advertises a lot of addresses or something?
> Could easily explain problems depending on the environment.

The link local address `fe80::/10` is always given independent on how many prefixes the router/gateway of the LAN distributes and how many IPv6 addresses a GNRC network interface can have. Since privacy extensions are not supported (or at least not enabled), this link local address is derived from the MAC address and fixed.

That is, as long as the route from the LAN machine to the ESP-NOW network behind the border router uses the link local address of ESP's WiFi interface as next hop, it should work.

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