Error Installing Node-red Modbus snap V3.0.2 on Ubuntu core 16

General
1

Hello all :wave:,

I am currently using Node red snap, V3.0.2(Node-Red Snap) and i'm trying to install node-red-contrib-modbus palette , Modbus Palette but however I can't install it and these are some of the errors i faced.

These are some of the steps i tried before coming here:

  • I have followed this Steps to install node red modbus but it didn't work.

These are some of the errors i faced

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Would appreciate your guidance, really lost at this point.

Thank you! :grin:

2

The snap version of Node-RED is highly constrained inside it's container. So adding nodes that require native code (like the serialport for modbus) won't work. You will need to use the full install instead.

3

@dceejay thanks for the reply!

Is there any way i can full install it? if so could you guide me on this.

Thanks!

4

I don't know about Ubuntu core, but I would start by trying the recommended Debian/Ubuntu/pi script. Running on Raspberry Pi : Node-RED

5

@Colin thanks for the reply!

I have already tried this method but unfortunately, i am not able to install the modbus Palette.:sweat_smile:

6

Do you mean you installed using the script (not the snap) and even then could not install the modbus node?
If so then go into your .node-red folder, remove the node_modules folder and run
npm install
If that fails then post the output here (copy/paste rather than screenshot please). If it succeeds then run
npm install node-red-contrib-modbus

7

@Colin

I will try that method, Thank you very much!

8

@Colin

Hi, but I just realize that i can't use that command for the node-red snap, but i was able to access the node red modules , but however doing the same Steps it did not allow me to install inside the node red modules file.

9

Sorry, but that sentence does not make it clear what you have now tried that fails.

10

@Colin

Hi, sorry for the late reply,

I have already tried to install the Modbus palette, but i have gotten the error from the first post, so I went into Node-Red Snap and tried to access and remove the node_modules folder from your suggestion, but however, it returned me with this error that most of them are read-only file system even though I tried to forcibly remove them.
error_readonly

11

My suggestion was that you could uninstall the snap version and use the usual node red install script.

12

@Colin

Ohh, my bad, is there any method using the snap version? so that I am able to install the Modbus palette?

13

Few, if any, here use the snap version so it may be difficult to find a solution.

14

@Colin

i see, thanks for the replies and help! Many thanks!

15

I think snap remove ... will remove a snap - snap --help will show you options.

16

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