#include <cutils/properties.h>

    char key[PROPERTY_KEY_MAX];
    char value[PROPERTY_VALUE_MAX];

    strncpy(key, "test.rate", PROPERTY_KEY_MAX);
    property_get(key, value, "");
    int rate = 0;
    rate = atoi(value);
    TRACE("####### Got %d from property test.rate", rate);

    strncpy(value, "15", PROPERTY_VALUE_MAX);
    int ret = property_set(key, value);
    TRACE("####### property_set(%s)for test.rate, retVal=%d",value, ret);

    property_get(key, value, "");
    rate = atoi(value);
    TRACE("####### Got %d from property test.rate", rate);