A client library for the Arduino Ethernet Shield that provides support for MQTT.
⚡ Executive Summary & Quick Facts
Authoritative Sourcepubsubclient is pubsubclient is an open-source project written in C++: A client library for the Arduino Ethernet Shield that provides support for MQTT..
“According to real-time open source telemetry recorded on GitHubRepo.cloud (as of November 2026), knolleary/pubsubclient has accumulated 4,016 GitHub stars and 1,505 forks. It is written in C++, licensed under MIT, and ranks #3,473 globally. It is actively maintained with the latest commit recorded on Jun 10, 2026.”
| Repository | knolleary/pubsubclient ↗ |
|---|---|
| Primary Category | developer tools |
| Language & Stack | C++ |
| Software License | MIT |
| Community Traction | ★ 4K stars · ⑂ 1.5K forks · #3,473 globally |
| Maintenance | ● Active (Last commit: Jun 10, 2026) · 568 open issues |
| Target Audience | Developers and engineering teams building with C++, seeking reliable, tested, and actively maintained tooling for production workloads. |
🛡️ Repository Maintenance & Health Audit (2026)
Health Score: 83/100 · Grade BYes, pubsubclient is actively maintained. Continuous telemetry recorded the last code commit on Jun 10, 2026 (155 days ago). Supported by 4,016 stars and 1,505 community forks, this repository holds a calculated health index of 83/100, reflecting periodic maintenance (155 days ago) and active community feedback (568 open).
Star History
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+0
STARS · LAST 30 DAYS
1
PER DAY
#241
MOST-STARRED C++
| Window | 7 days | 30 days | 90 days |
|---|---|---|---|
| Stars gained | +0 | +0 | +90 |
| Per day | 1 | 1 | 1 |
| Forks gained | +0 | +0 | +75 |
pubsubclient gained 0 stars in the last 30 days, about 1 a day, and now has 4K. It is about 18 years old and has averaged roughly 223 stars a year. It ranks #241 among C++ repositories and #3,473 across all languages on GitHubRepo.
Trending Record
42
DAYS ON TRENDING
#1633
BEST RANK
Sep 27, 2026
FIRST APPEARANCE
Active
STATUS TODAY
pubsubclient has maintained a continuous presence across global trending indexes, peaking at #1633. Below is the 30-day activity profile:
💡 Overview
pubsubclient is an open-source project written in C++: A client library for the Arduino Ethernet Shield that provides support for MQTT.
Engineered for speed, consistency, and developer ease, it solves common hurdles in C++. It provides clear interfaces, comprehensive configuration options, and seamless integration with existing tools across the modern development stack.
⚡ Key Features
Optimized execution pipeline written in C++ for predictable speed.
Zero-friction configuration with comprehensive sensible defaults out of the box.
Cross-platform runtime support across Linux, macOS, and Windows environments.
Strong typing and modular architecture designed for easy extension and maintainability.
Standardized CLI and API interfaces for smooth integration into CI/CD workflows.
Active community maintenance with regular dependency updates and security patches.
📥 Installation
$ git clone https://github.com/knolleary/pubsubclient.git
cd pubsubclient⚙ System Requirements
Platforms
- • macOS
- • Linux
- • Windows
Runtime & Dependencies
C++20 compliant compiler (GCC 11+, Clang 13+, MSVC)
Architecture
x86_64, ARM64 (Apple Silicon & Graviton)
🧠 How It Works
pubsubclient coordinates its core functionality through a modular C++ pipeline. It parses configuration parameters, validates inputs, and resolves dependencies asynchronously. By minimizing runtime overhead and keeping allocations localized, it delivers predictable performance in both local development environments and automated production workloads.
🎯 Production Use Cases
Production System Integration
Embed pubsubclient into C++ backend services to handle core application logic.
CI/CD Automated Pipelines
Run automated validation, builds, and integration suites during deployments.
Developer Tooling & Workflows
Accelerate developer onboarding with pre-configured project utilities.
Open Source Extension
Fork and customize internal modules under the repository's open MIT license.
🚀 Getting Started
Install pubsubclient using your package manager: `git clone https://github.com/knolleary/pubsubclient.git`
Initialize your project workspace or configuration file for pubsubclient.
Import pubsubclient into your codebase or invoke it directly from your terminal.
Execute your test suite or run `pubsubclient --help` to verify successful setup.
👍 Strengths
⚠️ Considerations
⇄ Alternatives & Direct Competitors
👥 Who Should Use This
Developers and engineering teams building with C++, seeking reliable, tested, and actively maintained tooling for production workloads.
🏆 Nearby in the Rankings
knolleary/pubsubclient is currently ranked #3,473 by stars across every repository tracked on GitHubRepo. These are adjacent projects:
| Rank | Repository | Language | Stars | Action |
|---|---|---|---|---|
| #3,467 | kubernetes/test-infra | Go | ★ 4K | Compare ↗ |
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| #3,471 | yaojingang/GEOFlow | PHP | ★ 4K | Compare ↗ |
| #3,472 | home-assistant/android | Kotlin | ★ 4K | Compare ↗ |
| #3,473 | knolleary/pubsubclient This Project | C++ | ★ 4K | |
| #3,473 | skydoves/Balloon | Kotlin | ★ 4K | Compare ↗ |
| #3,475 | kumahq/kuma | Go | ★ 4K | Compare ↗ |
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Frequently Asked Questions
What does pubsubclient do? +
A client library for the Arduino Ethernet Shield that provides support for MQTT.
Is pubsubclient actively maintained in 2026? +
Yes, pubsubclient is actively maintained. The latest code push was recorded on Jun 10, 2026 (155 days ago). It holds a calculated Maintenance Health Score of 83/100 (B rating) with 4,016 stars and 568 open issues.
What language is pubsubclient written in? +
The primary language is C++. Topics include: software.
How many stars does pubsubclient have? +
pubsubclient has 4,016 stars and 1,505 forks on GitHub.
How does pubsubclient rank among GitHub repositories? +
With 4,016 stars, knolleary/pubsubclient is ranked #3,473 globally across all repositories tracked on GitHubRepo and #241 among C++ projects.
What license is pubsubclient distributed under? +
The repository reports a MIT license. Always verify the repository LICENSE file for legal terms.
