[Solved] Given this MQTT client code snippet, what will be printed? import paho.mqtt.client as mqtt client = mqtt.Client() client.... Given this MQTT client code snippet, what will be printed? | Raspberry Pi

Raspberry Pi - MQTT for IoT

Given this MQTT client code snippet, what will be printed?

import paho.mqtt.client as mqtt
client = mqtt.Client()
client.on_connect = lambda client, userdata, flags, rc: print('Connected with code', rc)
client.connect('broker.hivemq.com', 1883)
client.loop_start()

AConnected with code 1

BConnected with code 0

CNo output

DSyntax error

Step-by-Step Solution

Solution:

Step 1: Understand on_connect callback
The callback prints 'Connected with code' followed by the connection result code.
Step 2: Recognize successful connection code
On success, rc is 0, so the printed message is 'Connected with code 0'.
Final Answer:
Connected with code 0 -> Option B
Quick Check:
MQTT connect success code = 0 [OK]

Quick Trick: MQTT connect success code is 0 [OK]

Common Mistakes:

MISTAKES

Expecting code 1 on success
Thinking no output occurs without loop_forever
Confusing syntax with runtime behavior

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Given this MQTT client code snippet, what will be printed?

Step 1: Understand on_connect callback

Step 2: Recognize successful connection code

Final Answer:

Quick Check:

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