Function esp_wifi_get_max_tx_power

pub unsafe extern "C" fn esp_wifi_get_max_tx_power(
    power: *mut i8,
) -> i32

@brief Get maximum transmiting power after WiFi start

@param power Maximum WiFi transmitting power, unit is 0.25dBm.

@return

• ESP_OK: succeed
• ESP_ERR_WIFI_NOT_INIT: WiFi is not initialized by esp_wifi_init
• ESP_ERR_WIFI_NOT_STARTED: WiFi is not started by esp_wifi_start
• ESP_ERR_INVALID_ARG: invalid argument