Update mqttd program, add cJSON parser and test ok with memory leak

guowenxue

2019-06-25 985548471892c5f2a7430c5f7b4c03fe39f0134f

 modules/c/ds18b20.c

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

    return 0;
}