This one covers the full IoT stack from embedded firmware to edge computing. You get MQTT client implementations in both Python and C for ESP32/Arduino, which is handy since you'll likely need both when building actual IoT systems. The code includes practical patterns like reconnection logic, QoS handling, and edge-based anomaly detection to reduce cloud traffic. What I like here is the edge processing class that buffers and aggregates sensor data locally before sending summaries upstream, which is exactly how you'd handle hundreds of chatty devices in production. It assumes you know your way around microcontrollers and networking protocols, so this isn't an intro guide.
npx skills add https://github.com/personamanagmentlayer/pcl --skill iot-expert