Libcoap

Libcoap is an open-source implementation of the Constrained Application Protocol (CoAP), designed for constrained devices and networks. CoAP is a specialized web transfer protocol for use with constrained nodes and constrained networks in the Internet of Things (IoT). It is defined in RFC 7252 and is optimized for low-power, low-memory devices, making it ideal for resource-constrained environments.

Libcoap provides a lightweight and efficient library for developing CoAP-based applications. It supports both client and server functionalities, allowing developers to create CoAP clients to interact with CoAP servers and CoAP servers to handle requests from CoAP clients. The library is written in C, ensuring compatibility with a wide range of embedded systems and platforms.

Key features of libcoap include:

- Support for CoAP over UDP and TCP

- Resource discovery and observation

- Block-wise transfers for large payloads

- Asynchronous I/O operations

- Extensible and modular design

Libcoap is widely used in various IoT projects and applications, providing a reliable and efficient means of communication for constrained devices. Its open-source nature allows for community contributions and continuous improvement, making it a valuable tool for developers working in the IoT space.