#iot

Implement robust MQTT communication for IoT sensor network. Architecture: 1. Broker selection (HiveMQ, Mosquitto). 2. Topic hierarchy design. 3. QoS level configuration (0, 1, 2). 4. Retained messages and Last Will and Testament (LWT). 5. TLS encryption for data in transit. 6. Device authentication (X.509 certs). 7. Data compression (Protobuf vs JSON). 8. Scalability testing with JMeter. Include offline message queuing strategy.