update mqttd program, add relay and beep code

guowenxue

2019-06-24 8da36d4f82336087de47f5eadcf2373f4843e292

 mqttd/main.c

@@ -60,7 +60,7 @@
        }
        else
        {
            printf("SHT2X Temperature=%lf ℃ relative humidity=%lf%\n", temp, rh);
            printf("SHT2X Temperature=%lfC, Relative humidity=%lf%% \n", temp, rh);
        }