Rename mqttd modules to hal and add makefile

guowenxue

2019-06-24 164590e50f7c6a26d7a92d5da6423ec8ce43f811

 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);
        }