You want to design a Raspberry Pi sensor system that sends temperature data reliably without duplicates, but network is unstable. Which MQTT QoS level should you choose and why?

hard🚀 Application Q15 of 15

Raspberry Pi - MQTT for IoT

AQoS 2, to guarantee exactly once delivery with no duplicates

BQoS 1, to ensure message arrives at least once

CQoS 1, because QoS 2 is not supported on Raspberry Pi

DQoS 0, for fastest delivery without retries

Step-by-Step Solution

Solution:

Step 1: Analyze requirements for reliability and no duplicates
The system needs reliable delivery and no duplicate messages despite unstable network.
Step 2: Match QoS levels to requirements
QoS 0 is fastest but unreliable, QoS 1 may duplicate, QoS 2 guarantees exactly once delivery.
Step 3: Confirm Raspberry Pi supports QoS 2
MQTT clients on Raspberry Pi support QoS 2, so it is suitable.
Final Answer:
QoS 2, to guarantee exactly once delivery with no duplicates -> Option A
Quick Check:
Reliable + no duplicates = QoS 2 [OK]

Quick Trick: Choose QoS 2 for no duplicates and reliable delivery [OK]

Common Mistakes:

MISTAKES

Choosing QoS 1 and ignoring duplicates
Thinking QoS 0 is reliable
Assuming Raspberry Pi can't use QoS 2

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More Raspberry Pi Quizzes

You want to design a Raspberry Pi sensor system that sends temperature data reliably without duplicates, but network is unstable. Which MQTT QoS level should you choose and why?

Step 1: Analyze requirements for reliability and no duplicates

Step 2: Match QoS levels to requirements

Step 3: Confirm Raspberry Pi supports QoS 2

Final Answer:

Quick Check:

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