update mqttd program, add mosquitto compile

guowenxue

2019-03-25 ed778b78c3ee7cb25aecb0d70efd66239662c44c

 modules/c/ds18b20.c

@@ -116,5 +116,7 @@
    /* convert string value to float value */
    *temp = atof(ptr)/1000;
   
    close(fd);

    return 0;
}