Lab 33. MQTT Control Loop

the goal of this lab is to build several control loops: heating up a mote causes the LED of another mote to switch on, over the Internet

list the MAC addresses of the motes you have which can act as :
- a sensor
  - temperature sensor
  - jumper wire to act as a switch
- an actuator
  - an LED that can be switched on
  - a buzzer

Answer 1:

Your instructor will coordinate that activity so everyone can see the entire list

form [sensors → actuator] pairs. What role is your mote playing, with what other mote?

Answer 2:

create a first flow which subscribed to all notifications with topic dustacademy/#

In MQTT, # is the wildcard: subscribing to dustacademy/# means you receive all messages published to dustacademy/foo and dustacademy/bar (and to dustacademy itself)

create a second flow which publishes all "oap" notifications onto the MQTT broker, using MQTT topic dustacademy
Draw your flow, indicating the configuration details of the nodes in your flow (including any code):

Answer 3:

once everyone is done, make sure you can see data from all motes appearing on the MQTT broker
modify your second flow to publish on topic dustacademy/<mac> where <mac> is your MAC address
what code did you use?

Answer 4:

create a third flow which prints the temperature of the temperature mote the instructor assigned you
Describe what you did:
Answer 3:
Modify that flow such that the LED of your LED mote switch on/off depending on the temperature:

When you are done, call you instructor and give a demo.
Describe your solution:
Answer 4: