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What does subscribing to a control topic on a Raspberry Pi typically allow you to do?

easy🧠 Conceptual Q1 of 15
Raspberry Pi - MQTT for IoT
What does subscribing to a control topic on a Raspberry Pi typically allow you to do?
ACreate new topics on the MQTT broker
BSend messages to other devices automatically
CChange the Raspberry Pi's hardware settings directly
DReceive messages sent to that topic and react accordingly
Step-by-Step Solution
Solution:

  1. Step 1: Understand MQTT subscription

    Subscribing means listening to messages sent to a specific topic.

  2. Step 2: Identify the effect on Raspberry Pi

    When subscribed, the Pi receives messages and can act on them.

  3. Final Answer:

    Receive messages sent to that topic and react accordingly -> Option D

  4. Quick Check:

    Subscribing = Receive messages [OK]
Quick Trick: Subscribe to listen and react to messages [OK]
Common Mistakes:
MISTAKES
  • Thinking subscription sends messages
  • Confusing subscription with publishing
  • Assuming hardware changes happen automatically

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