update mqttd to add configure file parser support

guowenxue

2019-06-26 6a924a29cefbea27a101790343137db819b361be

 apue/2.Socket/ds18b20.c

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

    return 0;
}