Since it is not possible to reenter the function `esp_now_recv_cb`, and the functions netif::_ recv and esp_now_netdev::_ recv are called directly in the same thread context, neither a mutual exclusion has to be realized nor have the interrupts to be deactivated.
Since the esp_now_recv_cb function is not called directly as an ISR through interrupts, it is not executed in the interrupt context. _recv can therefore be called directly. The treatment of the recv_event is no longer necessary.
Although it should not be possible to reenter the function esp_now_recv_cb, this is avoided by an additional boolean variable. It can not be realized by mutex because it would reenter from same thread context. If macro NDEBUG is not defined, an assertion is used.
Avoids parsing IPv6 packets to determine destination address.
Allows using 6Lo over ESP-NOW, which is required due to the low MTU of
ESP-NOW.
Co-authored-by: Gunar Schorcht <gunar@schorcht.net>
