Recommendation ITU-T Y.4453 addresses the concept of the adaptive software framework (ASF), identifies high-level requirements, and provides a reference functional architecture for the IoT devices. The ASF is a framework to manage and control adaptive IoT applications in real-time and dynamic way, and enables optimal QoS performance. The adaptive IoT application is an IoT application where its performance is changed by altering system resource allocation (e.g., the number of CPU cores, GPU utilization, network bandwidth, etc.). Therefore, the ASF can provide optimal applications working on IoT devices. And, the ASF is based on the IoT reference model [ITU-T Y.4000].