update mqttd program, add buzzer control and test ok

Guo Wenxue

2019-08-03 415fe8988e579c3185c7ba074733859506c1c7c3

 modules/c/ds18b20.c

@@ -32,7 +32,7 @@
                return 1;
        }

        printf("DS19B20 get temperature: %f ℃\n", temp);
        printf("DS18B20 get temperature: %f ℃\n", temp);
        return 0;
}