Function esp_idf_sys::uart_set_dtr

pub unsafe extern "C" fn uart_set_dtr(
    uart_num: uart_port_t, 
    level: c_int
) -> esp_err_t

@brief Manually set the UART DTR pin level.

@param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2 @param level 1: DTR output low; 0: DTR output high

@return - ESP_OK Success - ESP_FAIL Parameter error