Command acknowledgment handling in Drone Programming - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of acknowledgment status check

What is the output of this drone command acknowledgment code snippet?

Drone Programming

ack = {'cmd_id': 101, 'status': 'SUCCESS'}
if ack['status'] == 'SUCCESS':
    print(f"Command {ack['cmd_id']} executed successfully.")
else:
    print(f"Command {ack['cmd_id']} failed.")

A SyntaxError

B Command 101 failed.

C KeyError

D Command 101 executed successfully.

💡 Hint

Check the value of the 'status' key in the acknowledgment dictionary.

The code checks if the 'status' is 'SUCCESS'. Since it is, it prints the success message with the command ID.

🧠 Conceptual

intermediate

Understanding acknowledgment timeout handling

In drone command acknowledgment handling, what is the main purpose of implementing a timeout mechanism?

A To stop waiting for acknowledgment after a set time and handle failure

B To speed up the drone's flight path

C To retry sending the command indefinitely until acknowledged

D To log all commands regardless of acknowledgment

💡 Hint

Think about what happens if the drone never sends back an acknowledgment.

Timeout prevents the system from waiting forever and allows it to handle cases where the drone does not respond.

🔧 Debug

advanced

Identify the error in acknowledgment parsing

What error will this code raise when processing the acknowledgment?

Drone Programming

ack = {'cmd_id': 202, 'status': 'FAILURE'}
print(f"Command {ack['command_id']} status: {ack['status']}")

A KeyError

B TypeError

C SyntaxError

D No error, prints 'Command 202 status: FAILURE'

💡 Hint

Check the dictionary keys carefully.

The key 'command_id' does not exist in the dictionary; the correct key is 'cmd_id'. This causes a KeyError.

📝 Syntax

advanced

Syntax error in acknowledgment conditional

Which option fixes the syntax error in this acknowledgment check code?

Drone Programming

if ack['status'] = 'SUCCESS':
    print('Command succeeded')
else:
    print('Command failed')

A

if ack['status'] == 'SUCCESS'
    print('Command succeeded')
else:
    print('Command failed')

B

if ack['status'] := 'SUCCESS':
    print('Command succeeded')
else:
    print('Command failed')

C

if ack['status'] == 'SUCCESS':
    print('Command succeeded')
else:
    print('Command failed')

D

if ack['status'] = 'SUCCESS'
    print('Command succeeded')
else:
    print('Command failed')

💡 Hint

Remember the difference between assignment and comparison operators.

The single '=' is assignment and causes a syntax error in an if condition. '==' is the correct comparison operator.

🚀 Application

expert

Result of acknowledgment retry logic

Given this retry logic for command acknowledgment, what is the final value of 'attempts' after the loop ends?

Drone Programming

attempts = 0
max_attempts = 3
acknowledged = False
while attempts < max_attempts and not acknowledged:
    attempts += 1
    # Simulate acknowledgment received only on 3rd attempt
    if attempts == 3:
        acknowledged = True
print(attempts)

A 2

B 3

C 4

D 0

💡 Hint

Count how many times the loop runs until acknowledgment is True.

The loop increments attempts each time. On the 3rd attempt, acknowledgment becomes True, so the loop stops after attempts equals 3.