Raspberrypi.md

Prerequisites

• Raspberry pi with Raspberry pi OS installed. Recomended 32bit "NO DISPLAY".

Installing or Upgrading to NODE-RED

1. $ sudo apt update
2. $ bash <(curl -sL https://raw.githubusercontent.com/node-red/linux-installers/master/deb/update-nodejs-and-nodered)
3. $ sudo reboot

• for more information: https://nodered.org/docs/getting-started/raspberrypi

NODE-RED basic commands

• node-red-start - this starts the Node-RED service and displays its log output.
• node-red-stop - this stops the Node-RED service.
• node-red-restart - this stops and restarts the Node-RED service.
• node-red-log - this displays the log output of the service.

Make NODE-RED start on boot

1. $ sudo systemctl enable nodered.service

To disable the service, run the command:

1. $ sudo systemctl disable nodered.service

Open NODE-RED Editor

1. http://localhost:1880

Open with Local Network:

1. http://{your_ip_address}:1880

MQTT Broker

Installing MQTT Mosquitto Broker

1. $ sudo apt update
2. $ sudo apt install -y mosquitto mosquitto-clients

Unauthenticated access

1. $ sudo nano /etc/mosquitto/mosquitto.conf
2. add this line:

listener 1883
allow_anonymous true

Make MQTT Mosquitto start on boot

1. $ sudo systemctl enable mosquitto.service

To disable the service, run the command:

1. $ sudo systemctl disable mosquitto.service

Testing Mosquittoopen in the first tab:

1. $ mosquitto_sub -h {your_ip_address} -d -t testTopic on second tab:
2. $ mosquitto_pub -h {your_ip_address} -d -t testTopic -m "Hello world!"

for more information of commands: https://mosquitto.org/man/mosquitto-8.html

Testing MQTT clients on NODE-RED

1. Open Browser with: http://{your_ip_address}:1880
2. Import the test_mqtt.json file to the editor
3. Edit the mqtt nodes server to your ip address save it and deploy.
4. go to debug tab and trigger the inject.
5. check if the message is received from the mqtt_out at the same topic if not check your mqtt configurations or the network.