Progress toward using tokens with resource-constrained IoT devices has not fully matured; however, there are organizations adapting protocols such as OAuth 2.0 for the IoT. One such group is the Internet Engineering Task Force (IETF) through the Authentication and Authorization for Constrained Environments (ACE) effort. ACE has specified RFC 7744 Use Cases for Authentication and Authorization in Constrained Environments (reference: https://datatracker.ietf.org/doc/rfc7744/). The RFC use cases are primarily based on IoT devices that employ CoAP as the messaging protocol.
The document provides a useful set of use cases that clarify the need for a comprehensive IoT authentication and authorization strategy. RFC 7744 ...
