Rename mqttd modules to hal and add makefile

guowenxue

2019-06-24 164590e50f7c6a26d7a92d5da6423ec8ce43f811

 apue/2.Socket/ds18b20.c

@@ -98,5 +98,7 @@
    /* convert string value to float value */
    *temp = atof(ptr)/1000;
   
    close(fd);

    return 0;
}