CBOR for constrained devices in IOT Protocols - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to encode a simple integer using CBOR.

IOT Protocols

encoded = cbor2.dumps([1])

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

A42

B'42'

C3.14

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string '42' instead of integer 42

Using None which encodes as null

Using a float instead of integer

The integer 42 is encoded directly as a number in CBOR. Using quotes would encode it as a string.

2fill in blank

medium

Complete the code to decode CBOR data back to a Python object.

IOT Protocols

decoded = cbor2.loads([1])

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

A42

B'\x18\x2a'

Cb'\x18\x2a'

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Passing a string instead of bytes

Passing an integer directly

Passing None

The CBOR decoder expects bytes input. The bytes b'\x18\x2a' represent the CBOR encoding of 42.

3fill in blank

hard

Fix the error in the CBOR encoding of a dictionary.

IOT Protocols

encoded = cbor2.dumps([1])

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

A{temp: 22, humidity: 60}

B['temp', 22, 'humidity', 60]

C{'temp': '22', 'humidity': '60'}

D{'temp': 22, 'humidity': 60}

Attempts:

3 left

💡 Hint

Common Mistakes

Using a list instead of dict

Using unquoted keys

Using string values instead of integers

CBOR encodes dictionaries with keys as strings. Option D is a valid Python dict with string keys and integer values.

4fill in blank

hard

Fill both blanks to create a CBOR map comprehension filtering sensor data above 50.

IOT Protocols

{sensor: data[1] for sensor, data in readings.items() if data [2] 50}

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

A**2

B>

C>=

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using multiplication * instead of power **

Using >= instead of >

Using incorrect operators causing syntax errors

The comprehension squares the data value (using **2) and filters only those greater than 50.

5fill in blank

hard

Fill all three blanks to create a filtered CBOR map with uppercase keys and values above 30.

IOT Protocols

filtered = { [1]: [2] for [3], [2] in sensor_data.items() if [2] > 30 }

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

Asensor.upper()

Bvalue

Csensor

Ddata

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong variable names

Not uppercasing keys

Using 'data' instead of 'value'

The keys are converted to uppercase using sensor.upper(), values are 'value', and the loop variable is 'sensor'.