Function esp_wifi_get_bandwidth 

pub unsafe extern "C" fn esp_wifi_get_bandwidth(
    ifx: wifi_interface_t,
    bw: *mut wifi_bandwidth_t,
) -> esp_err_t

@brief Get the bandwidth of specified interface

@attention 1. Can not get WiFi bandwidth under band mode 2.4G + 5G (WIFI_BAND_MODE_AUTO), you can use esp_wifi_get_bandwidths instead @attention 2. API return ESP_ERR_NOT_SUPPORTED if the band mode is set to 2.4G + 5G (WIFI_BAND_MODE_AUTO)

@param ifx interface to be configured @param[out] bw store bandwidth of interface ifx

@return

• ESP_OK: succeed
• ESP_ERR_WIFI_NOT_INIT: WiFi is not initialized by esp_wifi_init
• ESP_ERR_WIFI_IF: invalid interface
• ESP_ERR_INVALID_ARG: invalid argument
• ESP_ERR_NOT_SUPPORTED: This API is not supported when the band mode is set to 2.4G + 5G (WIFI_BAND_MODE_AUTO)