esp_idf_sys

Function esp_now_register_send_cb

Source 
pub unsafe extern "C" fn esp_now_register_send_cb(
    cb: esp_now_send_cb_t,
) -> esp_err_t
Expand description

@brief Register callback function of sending ESPNOW data

@param cb callback function of sending ESPNOW data

@return - ESP_OK : succeed - ESP_ERR_ESPNOW_NOT_INIT : ESPNOW is not initialized - ESP_ERR_ESPNOW_INTERNAL : internal error