How to handle PSON what has array of objects?

I found out that get_property not work if trying to use it setup()
So i moved it to loop()

And here is my example code how i was able to iterate objects of array.

int pin=0;
pson data;
if (thing.get_property("DeviceList", data)) {
    if (data.is_object()) {
        pson_array my_array = (pson_array)data["devices"];
        if (my_array.size() > 0) {
            pson_container<pson>::iterator iterator = my_array.begin();
            bool pson_from_Iterator = iterator.valid();
            while (pson_from_Iterator) {
                data = iterator.item();
                if (data.is_object()) {
                    pin= (int)data["pin"];
                }
                else {
                    Serial.println("Array item wasn't object");
                }
                if (iterator.has_next()) {
                    pson_from_Iterator = iterator.next();
                }
                else {
                    Serial.println("All objects iterated");
                    pson_from_Iterator = false;
                }
            }
        }
        else Serial.println("Array was empty");
    }
    else {
        Serial.println("Device list is not object");
    }
}
else {
    Serial.print("No response for:");
    Serial.println("DeviceList");
}