Constrained Application Protocol (CoAP) is a specialized web transfer protocol for use with constrained nodes and constrained networks in the Internet of Things, as defined byIETF RFC 7252. CoAP adopts a REST model making it easy to learn and easy to adapt to HTTP. coaps:// is a related protocol, where “s” stands for a secure layer using DTLS. Learn more atcoap.technology.

The most scalable and reliable MQTT broker for AI, IoT, IIoT and connected vehicles

• UpdatedFeb 20, 2026
• Erlang

🐝 IoT Technical Guide --- 从零搭建高性能物联网平台及物联网解决方案和Thingsboard源码分析 ✨ ✨ ✨ (IoT Platform, SaaS, MQTT, CoAP, HTTP, Modbus, OPC, WebSocket, 物模型，Protobuf, PostgreSQL, MongoDB, Spring Security, OAuth2, RuleEngine, Kafka, Docker)

• UpdatedSep 5, 2023
• Java

Event-driven Infrastructure for Modern Cloud

• UpdatedFeb 16, 2026
• Go

教你设计物联网系统。构建自己的Internet of Things 。

• UpdatedJun 25, 2021
• HTML

Qt-SerialPort-HID-BLE-UDP-TCP-WebSocket-Modbus-CANBus-MQTT debugging tool, which support custom lua, javascript, chart view and data transmitting...

• UpdatedFeb 15, 2026
• C++

CoAP/DTLS Java Implementation

• UpdatedNov 9, 2025
• Java

Java Library for LWM2M

• UpdatedFeb 20, 2026
• Java

开源物联网平台 - 物联网解决方案的设备管理，数据收集，处理

• UpdatedDec 10, 2022
• Java

Eclipse Wakaama is a C implementation of the Open Mobile Alliance's LightWeight M2M protocol (LwM2M).

• UpdatedFeb 11, 2026
• C

JetLinks Core

• UpdatedFeb 10, 2026

Implementation of CoAP Server & Client in Go

• UpdatedFeb 19, 2026
• Go

Toolkit is a IoT protocol client CLI for IoT developer and learners. CoAP、MQTT And NB-IoT protocol are currently supported. It supports colors, autocompletion, internationalization(chinese, english and german…) and multi-platforms

• UpdatedMar 14, 2025
• Java

Framework to connect wearables and other IoT devices to mobile phones, tablets and PCs with an IP-based protocol stack over Bluetooth Low Energy

• UpdatedApr 17, 2024
• C

The Python CoAP library

• UpdatedJan 10, 2026
• Python

PENIOT: Penetration Testing Tool for IoT

• UpdatedFeb 22, 2022
• Python

A Constrained Application Protocol(CoAP) library implemented in Rust.

• UpdatedJan 20, 2026
• Rust

C implementation of the client-side OMA LwM2M protocol

• UpdatedFeb 9, 2026
• C

How can you communicate to your ikea tradfri gateway/hub through coap-client

• UpdatedFeb 28, 2024
• Shell

Integrate your Shelly devices into ioBroker via MQTT or CoIoT

• UpdatedFeb 8, 2026
• JavaScript

Secure and Interoperable Internet of Things

• UpdatedFeb 17, 2026
• Go