MQTT Client Implementation - Sensor Nodes

[MFelida]

Description: Implement MQTT client functionality on sensor nodes for publishing noise level data.

Tasks:

• Integrate MQTT client library for embedded platform (Pico SDK)
• Implement connection management and reconnection logic
• Design topic structure for sensor data publishing
• Implement data serialization (JSON/MessagePack/Protobuf)
• Add error handling and connection state monitoring
• Implement Quality of Service (QoS) level configuration

Deliverables:

• MQTT client module for sensor nodes
• Topic naming convention documentation
• Data format specification