| ASN.1 Support (Internal) | CoAP ASN.1 Structures, Enums and Functions that are not exposed to applications |
| Application I/O Handling | API functions for Application Input / Output |
| Application I/O Handling (Internal) | Internal API functions for Application Input / Output |
| Asynchronous Messaging | API functions for Async "separate" messages |
| Asynchronous Messaging (Internal) | CoAP Async Structures, Enums and Functions that are not exposed to applications |
| Block (Internal) | Structures, Enums and Functions that are not exposed to applications |
| Block Transfer | API functions for handling PDUs using CoAP BLOCK options |
| Cache Support | API functions for CoAP Caching |
| Cache Support (Internal) | CoAP Cache Structures, Enums and Functions that are not exposed to applications |
| Clock Handling | Default implementation of internal clock |
| Context Handling | API functions for handling PDUs using CoAP Contexts |
| Context Handling (Internal) | CoAP Context Structures, Enums and Functions that are not exposed to applications |
| DTLS Support | API functions for interfacing with DTLS libraries |
| DTLS Support (Internal) | CoAP DTLS Structures, Enums and Functions that are not exposed to applications |
| Encode / Decode API | API functions for endoding/decoding CoAP options |
| Event API | API functions for event delivery from lower-layer library functions |
| Logging Support | API functions for logging support |
| Observe Subscription (Internal) | CoAP Observe Subscription Structures, Enums and Functions that are not exposed to applications |
| Option Filters | API functions for access option filters |
| PDU | API functions for PDUs |
| PDU (Internal) | CoAP PDU Structures, Enums and Functions that are not exposed to applications |
| Pseudo Random Numbers | API functions for gerating pseudo random numbers |
| Rate Control | The transmission parameters for CoAP rate control ("Congestion
Control" in stream-oriented protocols) are defined in https://tools.ietf.org/html/rfc7252#section-4.8 |
| Resource Configuraton | API functions for setting up resources |
| Resource Observation | API functions for interfacing with the observe handling (RFC7641) |
| Resources (Internal) | Structures, Enums and Functions that are not exposed to applications |
| Sessions | API functions for CoAP Sessions |
| Sessions (Internal) | CoAP Session Structures, Enums and Functions that are not exposed to applications |
| String handling support | API functions for handling strings and binary data |
| TCP Support (Internal) | CoAP TCP Structures, Enums and Functions that are not exposed to applications |
| URI Parsing Functions | CoAP PDUs contain normalized URIs with their path and query split into multiple segments |
1.9.1