knolleary/pubsubclient
Pubsubclient
该项目是一个用于 Arduino 板的轻量级 MQTT 客户端库，专为使用以太网屏蔽 (Ethernet Shield) 的嵌入式系统设计。它作为一个嵌入式消息客户端，允许硬件设备在远程消息代理上发布和订阅主题。
该库提供核心 MQTT 集成，包括代理连接管理和服务器心跳维护。它支持基于主题的消息发布和订阅管理，支持注册监听器以在消息到达时触发函数。
该系统涵盖了网络连接配置（如缓冲区大小和套接字超时），以及用于识别失败连接尝试的客户端状态监控。它实现了一个非阻塞执行循环来处理传入数据包并管理网络传输。
Features
- Arduino MQTT Clients - Provides a lightweight MQTT client implementation specifically for Arduino boards with Ethernet shields.
- MQTT Broker Connections - Manages TCP connections to MQTT brokers and negotiates protocol versions for messaging.
- PubSub IoT Messaging - Implements a publish and subscribe messaging pattern for IoT devices to exchange information.
- Client-to-Client Messaging - Provides a client-side implementation for publish-subscribe communication between hardware devices and brokers.
- MQTT Clients - Implements the MQTT client protocol for publishing and subscribing to messages via a broker.
- MQTT Topic Publishing - Enables sending data to specific topics using standard payloads or memory-stored messages.
- Socket Networking - Establishes a persistent TCP socket connection with a remote MQTT broker via hardware interfaces.
- Topic Subscription Management - Manages the registration of interests in specific communication topics to receive messages.
- Non-Blocking Event Loops - Utilizes a non-blocking event loop to process network packets and maintain the MQTT heartbeat.
- Subject Subscription Filtering - Allows registering interest in MQTT topics using string identifiers to filter incoming data streams.
- Remote Telemetry Reporting - Enables sending sensor readings from an Ethernet shield to a remote dashboard using MQTT.
- Physical Hardware Control - Enables triggering physical actions on a microcontroller by sending command messages over MQTT.
- Connection State Management - Tracks the internal client state to manage reconnections and publishing permissions.
- Heartbeat Frames - Implements application-level keep-alive heartbeats to maintain persistent connections with the MQTT broker.
- Callback-Based Event Dispatchers - Provides a system to route incoming MQTT messages to application-defined callback functions.
- MQTT Libraries and Brokers - MQTT client for Arduino Ethernet Shield.
