Function esp_idf_bindgen::esp_now_get_peer_num

pub unsafe extern "C" fn esp_now_get_peer_num(
    num: *mut esp_now_peer_num_t
) -> esp_err_t

@brief Get the number of peers

@param num number of peers

@return - ESP_OK : succeed - ESP_ERR_ESPNOW_NOT_INIT : ESPNOW is not initialized - ESP_ERR_ESPNOW_ARG : invalid argument