knolleary/pubsubclient
A client library for the Arduino Ethernet Shield that provides support for MQTT. observed · 2026-08-28
Health v2 · maintenance only
62/100
- Activity 86
- Release rhythm 8
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-02. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 6421
- days_rel: n/a
- days_push: 84
- n_releases_24m: 0
Adoption not part of the score
4014 stars · 1503 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
PubSubClient is an Arduino C++ client library providing simple MQTT publish/subscribe messaging over the Arduino Ethernet Client API. It works with Ethernet/WiFi shields, ESP8266, and ESP32 boards, but the author has explicitly declared it unmaintained.
Use cases
- connect an Arduino or ESP32 to an MQTT broker
- publish sensor readings over MQTT from ESP8266
- subscribe to MQTT topics on embedded hardware
- send IoT telemetry with publish/subscribe messaging
- MQTT client library for Arduino Ethernet Shield
When to choose
- you need a tiny, simple MQTT client for a legacy Arduino project already using it
- your messages are small (256-byte default limit) and QoS 0 publishing suffices
When to avoid
- starting a new project - the author urges using an actively maintained alternative
- you need QoS 2 or large message payloads
- you need MQTT 5 features
Facets
library · maturity abandoned
message-queue http-client iot iot embedded-systems embedded iot cpp mqtt arduino esp8266 esp32 publish-subscribe unmaintained messaging
4 sources
- readme: https://github.com/knolleary/pubsubclient · fetched 2026-08-28 · 5e75a06137f5
- homepage: http://pubsubclient.knolleary.net/ · fetched 2026-08-29 · 14023b09d5f0
- site_page: http://pubsubclient.knolleary.net/api · fetched 2026-08-29 · f8df371efdb7
- site_page: http://pubsubclient.knolleary.net/api.html · fetched 2026-08-29 · f8df371efdb7
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| knolleary/pubsubclient | main | 62 |
For agents
markdown · JSON · MCP: product_card(name="knolleary/pubsubclient")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem