Device shadow (digital twin) in IOT Protocols - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to update the device shadow state with the reported temperature.

IOT Protocols

shadow_update = {"state": {"reported": {"temperature": [1]

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

A"22"

Btemperature

Ctemp

D22

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around the number, making it a string instead of a number.

The reported temperature value should be a number, so use 22 without quotes.

2fill in blank

medium

Complete the code to retrieve the desired state from the device shadow JSON.

IOT Protocols

desired_state = shadow_document["state"][[1]]

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

A"reported"

B"desired"

C"current"

D"status"

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'reported' instead of 'desired' key.

To get the desired state, access the "desired" key inside the "state" object.

3fill in blank

hard

Fix the error in the code to correctly publish the shadow update to the MQTT topic.

IOT Protocols

mqtt_client.publish("$aws/things/[1]/shadow/update", json.dumps(shadow_update))

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

Athing_name

Bdevice-name

CthingName

Ddevice_id

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect variable names that don't match the thing name.

The MQTT topic requires the thing name, which is usually stored in 'thing_name' variable.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that filters reported states with temperature above 25.

IOT Protocols

{k: v for k, v in shadow_state[[1]].items() if v [2] 25}

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

A"reported"

B>

C<

D"desired"

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'desired' instead of 'reported'.

Using '<' instead of '>'.

We want to filter the 'reported' states where the value is greater than 25.

5fill in blank

hard

Fill all three blanks to create a shadow update payload with desired humidity set to 60 and reported temperature unchanged.

IOT Protocols

shadow_payload = {"state": {"desired": {"humidity": [1], "reported": {"temperature": [2], "clientToken": [3]

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

A60

Bcurrent_temp

C"token123"

D"60"

Attempts:

3 left

💡 Hint

Common Mistakes

Using string '60' instead of number 60.

Using wrong variable for temperature.

Missing quotes around clientToken string.

The desired humidity is 60 (number), temperature uses current_temp variable, and clientToken is a string token.