Internet of Things ( Lecture 4)

Internet of Things ( Lecture 4)

 Challenges of IoT

Multiple Select

Select the challenges of IOT

• Connectivity:

• Continuity

• Compliance

• Coexistence

• Cybersecurity

Multiple Choice

Why need time.sleep() in the following program?

import time from grovepi import *

led = 4 pinMode(led,"OUTPUT")

time.sleep(1)

while

True: try: digitalWrite(led,1)

time.sleep(0.5)

digitalWrite(led,0)

time.sleep(0.5)

except KeyboardInterrupt:

digitalWrite(led,0)

break

except IOError: print("IOError")

• to let the Rasp Pi rest

• to save power

• to generate delay

Fill in the Blanks

Why use try and exception case in the following program?

import time from grovepi import *

import math

buzzer_pin = 6

button = 8

pinMode(buzzer_pin, "OUTPUT")

pinMode(button, "INPUT")

#analogWrite(buzzer_pin,0)

digitalWrite(buzzer_pin, 0)

i = 0

while True:

try:

button_status = digitalRead(button)

if button_status:

analogWrite(buzzer_pin,i)

#digitalWrite(buzzer_pin, 1)

else:

analogWrite(buzzer_pin,0)

if i < 250:

i += 10

else:

i = 0

#digitalWrite(buzzer_pin, 0)

except KeyboardInterrupt:

digitalWrite(buzzer_pin, 0)

break

except IOError:

print("IOError")

Multiple Select

WHY USE TOKENS?

• Tokens are stateless. The token is self-contained and contains all the information it needs for authentication. This is great for scalability as it frees your server from having to store session state.

• Tokens can be generated from anywhere. Token generation is decoupled from token verification allowing you the option to handle the signing of tokens on a separate server or even through a different company such us Auth0.

• Fine-grained access control. Within the token payload you can easily specify user roles and permissions as well as resources that the user can access.

Call API

To call your API from a regular web application, the application must pass the retrieved Access Token as a Bearer token in the Authorization header of your HTTP request.