Data Pipeline with Buffering

Design a Python data pipeline with threaded buffering. The producer reads data from a sensor (simulated) and pushes into a bounded queue. The consumer thread processes and writes results to a file. Backpressure must be enforced.

Constraints

• Use queue.Queue with maxsize.
• producer() blocks when full.
• consumer() blocks when empty.
• Use sentinel None to stop.
• Flush file operations cleanly.
• Handle KeyboardInterrupt.