MQTT keep-alive and timeout in IOT Protocols - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the MQTT keep-alive interval to 60 seconds.

IOT Protocols

client.connect(broker_address, keepalive=[1])

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

A60

B0

C120

D30

Attempts:

3 left

💡 Hint

Common Mistakes

Setting keep-alive to 0 disables it, which is not recommended here.

The keep-alive interval is set to 60 seconds to ensure the client sends a ping to the broker every 60 seconds.

2fill in blank

medium

Complete the code to handle MQTT client timeout after missing pings.

IOT Protocols

client.on_disconnect = lambda client, userdata, rc: print('Disconnected with result code [1]')

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

A4

B0

C1

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing result code 0 (normal disconnect) with timeout code.

Result code 1 indicates the client disconnected due to a network timeout or keep-alive failure.

3fill in blank

hard

Fix the error in the MQTT client setup to correctly specify the keep-alive parameter.

IOT Protocols

client.connect(broker, port, keepalive=[1])

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

A'60'

B60

Cnull

Dtrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around numbers for keepalive.

The keepalive parameter must be an integer, not a string or other type.

4fill in blank

hard

Fill both blanks to create a dictionary that sets keep-alive to 45 and timeout to 120 seconds.

IOT Protocols

config = { 'keepalive': [1], 'timeout': [2] }

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

A45

B60

C120

D30

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up keepalive and timeout values.

The keepalive is set to 45 seconds and timeout to 120 seconds as required.

5fill in blank

hard

Fill all three blanks to create a function that sets keep-alive, timeout, and prints a status message.

IOT Protocols

def setup_mqtt(client, keep_alive, timeout):
    client.connect('broker.hivemq.com', 1883, keepalive=[1])
    client._timeout = [2]
    print(f'MQTT setup with keep-alive=[3] seconds and timeout=[2] seconds')

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

A30

B120

Ckeep_alive

D60

Attempts:

3 left

💡 Hint

Common Mistakes

Using hardcoded values instead of function parameters in print.

The function uses 60 seconds for keep-alive, 120 seconds for timeout, and prints the keep_alive parameter value.