You want your Raspberry Pi to send live temperature updates to a web page using WebSocket. Which approach best ensures the web page updates instantly when the sensor value changes?

hard🚀 Application Q15 of 15

Raspberry Pi - Web Server and API

AOpen a new WebSocket connection every time the temperature changes.

BOpen a WebSocket connection once, then send new temperature data whenever it changes.

CSend temperature data only when the web page reloads.

DUse HTTP GET requests repeatedly to fetch temperature data.

Step-by-Step Solution

Solution:

Step 1: Understand WebSocket usage for live updates
WebSocket keeps a connection open, so sending data only when it changes over the same connection is efficient and instant.
Step 2: Evaluate other options
Opening new connections repeatedly (B) wastes resources. Sending data only on reload (C) or using HTTP polling (D) is slower and less real-time.
Final Answer:
Open a WebSocket connection once, then send new temperature data whenever it changes. -> Option B
Quick Check:
One open connection + send updates = instant live data [OK]

Quick Trick: Keep one connection open; send updates as they happen [OK]

Common Mistakes:

MISTAKES

Opening multiple connections unnecessarily
Relying on page reloads for updates
Using HTTP polling instead of WebSocket

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More Raspberry Pi Quizzes

You want your Raspberry Pi to send live temperature updates to a web page using WebSocket. Which approach best ensures the web page updates instantly when the sensor value changes?

Step 1: Understand WebSocket usage for live updates

Step 2: Evaluate other options

Final Answer:

Quick Check:

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