ESP32 - MQTT - Node-Red Integration Project

Authors: Mike Camara, Helen Tera & Lino Mediavilla.

Instructor: Jaanus Kaugerand.

ESP32 side

• It builds on the previous examples built over the course.
• We have a queue for communication between producer and publisher FreeRTOS tasks.
• We defined a global variable to toggle data production on/off.
• In the mqtt_event_handler_cb function, we switch on the event_id and in the case of MQTT_EVENT_DATA, we perform the necessary checks and update the enableProduce variable as requested by the message payload.
• The producer task periodically checks enableProduce to know if it must produce or just sleep.

Node-Red side

The following node-red flow was implemented.

• Details to connect to our broker deployed on Digital Ocean are set on the mqtt_in and mqtt_out nodes.

• There is a topic for receiving data from the client, and another to send a command to toggle data production.

  

  Data Production off:

  

  Data Production on: