MQTT Basics: Pub/Sub & Keepalive
Connect to broker, publish sensor data, auto-reconnect.
📚 Tag: Mqtt
MQTT over TLS (CA/Client cert)
Secure MQTT connection with TLS.
Project: Door Sensor to MQTT via ESP‑NOW
Door node -> gateway publishes to MQTT.
Project: Mini Weather Station
DHT/AHT + OLED + MQTT + Web UI.
Topic Design, QoS, and LWT
Design MQTT topics, choose QoS, use LWT.
Troubleshooting WiFi/MQTT: Checklist
Common pitfalls and fixes.