Function esp_idf_sys::esp_now_add_peer

pub unsafe extern "C" fn esp_now_add_peer(
    peer: *const esp_now_peer_info_t
) -> esp_err_t

@brief Add a peer to peer list

@param peer peer information

@return - ESP_OK : succeed - ESP_ERR_ESPNOW_NOT_INIT : ESPNOW is not initialized - ESP_ERR_ESPNOW_ARG : invalid argument - ESP_ERR_ESPNOW_FULL : peer list is full - ESP_ERR_ESPNOW_NO_MEM : out of memory - ESP_ERR_ESPNOW_EXIST : peer has existed