Function esp_idf_svc::sys::esp_ble_tx_power_get

pub unsafe extern "C" fn esp_ble_tx_power_get(power_type: u32) -> u32

@brief Get BLE TX power Connection Tx power should only be get after connection created. @param power_type : The type of which tx power, could set Advertising/Connection/Default and etc @return >= 0 - Power level, < 0 - Invalid