I am designing a data ingestion pipeline for a large-scale IoT network where thousands of sensors upload telemetry data intermittently. Due to the high frequency of writes and the distributed nature of the edge devices, we cannot rely on a central server to assign unique IDs for each data packet. We need a method for the devices themselves to generate a unique identifier that will stay consistent throughout the data's lifecycle in our analytics platform. Are GUIDs appropriate for resource-constrained hardware, or will the generation process be too taxing for simple microcontrollers?