OpenEnergyMonitor emonPi NodeRED Setup

Archive Documentation: The instructions on the page are outdated and may not be relevant, please follow latest NodeRED installation guide

Default Node-RED config for emonPi

User Guide

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Install

http://nodered.org/docs/hardware/raspberrypi.html

At time of writing (Assuming running Raspbian Jessie):

sudo apt-get install nodered

Start node Red at boot:

sudo systemctl enable nodered.service

View NodeRED log

In var/syslog filter with

$ sudo journalctl -f -u nodered -o cat

Move user data partition to RW ~/data partition on emonPi

mv /home/pi/.node-red ~/data/node-red

Test with:

node-red-pi --max-old-space-size=128  --userDir /home/pi/data/node-red

Create symlink to /home/pi/data/node-red from standard location /home/pi/node-red

sudo ln -s /home/pi/data/node-red /home/pi/.node-red

Note: creating symlink to ~/data from default data folder location is better then setting custom data folder location in nodered service since symlink method will survice a node-RED update cycle.

Start at boot using custom user data location

sudo nano /lib/systemd/system/nodered.service

Add line to the [service] section

Environment="NODE_RED_OPTIONS=--userDir /home/pi/data/node-red"

Save an exit nano then run:

sudo systemctl daemon-reload
sudo service nodered restart

Install emoncms flow

$ sudo apt-get install npm
$ cd ~/data/node-red
$ sudo npm install node-red-node-emoncms
$ sudo npm install node-red-node-weather-underground

Add authentication security for flow editor

Generate password hash

$ node-red-admin hash-pw

If required $ sudo npm install bcryptjs Alternate method node -e "console.log(require('bcryptjs').hashSync(process.argv[1], 8));" your-password

Copy generated password hash

sudo nano /home/pi/data/node-red/settings.js

Uncomment adminAuth security section and insert username and password hash

Default settings file example

Make authentication work with read-only file system (NOT USED)

ONLY NEEDED IF NOT MOVING USER FOLDER TO RW PARTITION

https://groups.google.com/forum/#!topic/node-red/qC0PC0yTpLk

sudo nano ~/.node-red/settings.js

Add line:

readOnly: true

in module.exports

The storage plugin won't do anything that writes to disk - the operations will silently fail, so the runtime will continue as normal, but nothing will be saved.

For future ref Node-RED install location: /usr/lib/node_modules/node-red/