Tag Archives: Welcome updates to Node-Red

A Brighter Node Red

Just today  – an upgrade notice for Node-Red appeared in my in-box. Upgrade details are here.

What is Node-Red?  Details here – if you’re not using it or at least investigating it – you may be missing out.

Now, the support guys (Google groups here) are VERY clear about required versions of NPN etc. so I suggest you read that update page carefully.  Because I had 2 identical machines (NanoPi M1 as it happens) I thought I’d go for broke. Don’t copy me unless you have a reliable, easy to get to backup – it may well go wrong (mine didn’t) and you’ll be on your own for not precisely following the instructions.

sudo npm cache clean
sudo npm update -g --unsafe-perm node-red

I had already installed the latest (previous Node-Red – maybe a couple of weeks old) – not the default Raspberry Pi version but a manually installed version – along with NPM and the latest NODE and that is NOT what they recommend. I turned Node-Red off (node-red-stop) and used the above commands as PI user (I know, not on a Raspberry Pi but to make my life easy I always make a PI user who belongs to all the PI groups including SUDO)  - I then turned Node-Red on (node-red-start).

Voila. It worked first time.  0.14.0

Now – so what’s special – well, one of my issues with Node-Red has been initialisation of variables – sometimes a global variable can get used before it has been defined!!

The team told me a while ago that the LEFT-MOST tab gets run first – of course that’s no good if your inits are not in the left most tab (I have a tab called “init”). Well now it is because you can SLIDE the tab order about with the mouse – how neat is that!

The DEBUG panel now lets you see message from all over – or just the current tab – which is nice and there are some new nodes and other improvements – I’ll let you read all about them here. The big one that stands out is the LINK node. I HATE making large tabs that are really complicated – but to split them up involves passing messages between tabs – and until now that had to be done the hard way – by global variables (not ideal as you have to poll them) or MQTT or similar. Well now there is a node for THAT as well.

Then I spotted a bug – the exec function would no longer take numbers as arguments – only strings (which is what you’d expect but it had always accepted numbers).  I reported this early evening. Meanwhile someone reported an issue with MQTT…  so the guys amazingly quickly fixed all this.

sudo npm cache clean
sudo npm update -g --unsafe-perm node-red

Erm, no – this time no messages, just accepted my commands but no update.  It was a bit late to expect answers out of anyone… so KNOWING I HAD A BACKUP and stopping Node-Red first then restarting afterwards…

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

Worked a TREAT – I’m now sitting on version 0.14.3 with all my flows intact. The exec issue has gone away and here we are the next morning, after a few more checks I’ll progress with updating my other installations.

The team are to be congratulated on the work they’ve done on this tool – it costs us nothing but opens up entirely new possibilities to both beginners and seasoned programmers.  Very different image of IBM to the one I had when I was a kid (huge buildings, everyone talking in abbreviations, obscenely expensive leased servers) – at least that’s what I remember  - probably wrong Smile