MQTT broker role in IOT Protocols - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start an MQTT broker using the popular Mosquitto service.

IOT Protocols

sudo systemctl [1] mosquitto

Drag options to blanks, or click blank then click option'

Astop

Bstatus

Cstart

Drestart

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'stop' instead of 'start' stops the service.

Using 'status' only shows the service status but does not start it.

The start command launches the Mosquitto MQTT broker service.

2fill in blank

medium

Complete the command to check if the MQTT broker is running.

IOT Protocols

sudo systemctl [1] mosquitto

Drag options to blanks, or click blank then click option'

Adisable

Benable

Cstart

Dstatus

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'start' will try to launch the service instead of checking it.

Using 'enable' or 'disable' changes startup behavior but does not show running status.

The status command shows if the Mosquitto broker is active and running.

3fill in blank

hard

Fix the error in the command to restart the MQTT broker.

IOT Protocols

sudo systemctl [1] mosquitto

Drag options to blanks, or click blank then click option'

Astop

Brestart

Creload

Dstatus

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'reload' may not fully restart the service.

Using 'stop' only stops the service without starting it again.

The restart command stops and then starts the Mosquitto broker, applying any changes.

4fill in blank

hard

Fill both blanks to create a command that enables the MQTT broker to start automatically on boot and then start it now.

IOT Protocols

sudo systemctl [1] mosquitto && sudo systemctl [2] mosquitto

Drag options to blanks, or click blank then click option'

Aenable

Bstart

Cstop

Ddisable

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'stop' or 'disable' will prevent the broker from running.

Reversing the order may start the service but not enable it on boot.

enable sets the broker to start on boot, and start runs it immediately.

5fill in blank

hard

Fill all three blanks to create a command that shows the MQTT broker logs, filters for errors, and limits output to the last 10 lines.

IOT Protocols

sudo journalctl -u mosquitto | grep [1] | tail -n [2]

Drag options to blanks, or click blank then click option'

Awarning

Berror

C10

Dinfo

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'warning' or 'info' filters different log levels.

Not limiting lines may show too much output.

This command filters Mosquitto logs for error messages and shows the last 10 lines.