Top 7 C++ internet-of-thing Projects

connectedhomeip

137 6,964 10.0 C++

Matter (formerly Project CHIP) creates more connections between more objects, simplifying development for manufacturers and increasing compatibility for consumers, guided by the Connectivity Standards Alliance.

Project mention: ESP32-C3 Wireless Adventure: A Comprehensive Guide to IoT [pdf] | news.ycombinator.com | 2023-06-14

They do have example Matter projects for the ESP32-C3/S3. I assume it's over WiFi and not thread.
https://github.com/project-chip/connectedhomeip/tree/master/...

blynk-library

13 3,794 7.3 C++

Blynk library for IoT boards. Works with Arduino, ESP32, ESP8266, Raspberry Pi, Particle, ARM Mbed, etc.
WorkOS

workos.com sponsored

The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
openthread

1 3,364 9.7 C++

OpenThread released by Google is an open-source implementation of the Thread networking protocol

Project mention: How to know if device is being used as bridge? | /r/MatterProtocol | 2023-12-10

See https://github.com/openthread/openthread/issues/3311 You probably need an nRF dongle (costs only a few bucks. I think I bought 2 for €12 a year ago.)

ggwave

37 1,849 4.4 C++

Tiny data-over-sound library

Project mention: Google Tone: Broadcast any URL to devices within earshot | news.ycombinator.com | 2023-07-16

Sming

1 1,438 8.4 C++

Sming - powerful open source framework simplifying the creation of embedded C++ applications.
ModuleInterface

2 67 0.0 C++

Easy config and value sync between IoT modules, database and web pages (by fredilarsen)
Eduponics-Mini

3 56 4.9 C++

MicroPython MQTT & code example for Eduponics mini ESP32 learning kit (by STEMinds)
InfluxDB

www.influxdata.com sponsored

Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).