Node-RED

This wiki document explains how to install on your Raspberry the package that contains the following modules:

These nodes interact with LogicLab and their aim is to, respectively, read/write a value for a requested symbol target.

After the installation, these nodes will appear into the function tab of the palette.

Requirements

In order to make this package work, you have to install the JavaScript runtime Node.js, the package manager npm and Node-RED.

Note: The package has been developed and tested with v8.11.1 of Node.js and v5.6.0 of npm.

Install Node.js and npm

The package manager npm is provided along with the Node.js installation package.

Open up a terminal and execute the following commands:

sudo apt-get update 
sudo apt-get dist-upgrade
curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash -
sudo apt-get install -y nodejs

Now you can check that both Node.js and npm have been installed with:

node -v
npm -v

Look here for further details.

Install Node-RED

You can install Node-RED using the following npm command:

 sudo npm install -g --unsafe-perm node-red

Ignore any error regarding the module node-pre-gyp.

Further information can be found here.

Install the package

Download LLSymbols_Node-RED-raspberry.zip from here.

Once you downloaded LLSymbols_Node-RED-raspberry.zip, move it to the following path:

/home/pi/

Now open up a terminal, unzip the file and change the directory path to the folder where Node-RED had been installed. After that you can add the package by using the appropriate npm command.

The following commands summarize these steps:

cd /home/pi
unzip LLSymbols_Node-RED-raspberry.zip -d .
cd /usr/lib/node_modules/node-red
sudo npm install /home/pi/LLSymbols_Node-RED

Now you are ready to start Node-RED.

Run Node-RED

node-red start