Constant esp_idf_sys::pbuf_layer_PBUF_RAW_TX

pub const pbuf_layer_PBUF_RAW_TX: pbuf_layer = 0;

Includes spare room for additional encapsulation header before ethernet headers (e.g. 802.11). Use this if you intend to pass the pbuf to functions like netif->linkoutput(). @see PBUF_LINK_ENCAPSULATION_HLEN