Problem with Exec

General
1

Hi, I'm using the exec node in Node-RED. I want to play a sound clip when I give input to the exec node. When I run the command manually via the command line in Putty, everything works fine. However, when I run the same command in the exec node, nothing happens. There are no error messages, and in debug 3, it shows 'code 0'.

What could be wrong?

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2

This is tricky.

I've checked on one of my machines and it can be done.

Could you open the exec node and screenshot what you have there?

3

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4

Ok, pretty much the same as I have.

So you connect to the remote machine via Putty and you enter mpg123 /home/louis/Music/hoho1.mp3 and you hear the sound?

Sorry, I just want to be sure.

5

I think there is a problem with the path.

You need to enable your public thing in the settings file for node-red

so the sound file has to be in that directory.

eg: from my working one.
(This is in a template node to build the message)
/home/pi/.node-red/public/Sounds/{{payload}}
and my exec node uses the payload

(settings file change needed)

    // When httpAdminRoot is used to move the UI to a different root path, the
    // following property can be used to identify a directory of static content
    // that should be served at http://localhost:1880/.
    //httpStatic: '/home/nol/node-red-static/',
    httpStatic: '/home/pi/.node-red/public',     //  <-- this line here
    //httpStatic: '/home/pi',

Hope that helps.

6

Yes I do it and it works in Putty

7

See my last post.

I really suspect that is the problem.

Something to do with permissions.

The file to be played has to be in the declared public directory - as set in the settings.js file in the .node-red directory.

So you will have to make a directory in .node-red called public (or Public if you want) then you put the sound file in that directory.

OR you add a sub-directory for sounds, and put the file in that one.

Sorry I can't be more helpful, it is near my limits of help.
So the command would be more like:
mpg123 /home/pi/louis/.node-red/public/sound/hoho1.mp3

AND you will have to restart node-red to get it working.

8

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It does it in Putty but not in Node-red.
The difference is that I don't have the pi folder I think.

9

Sorry, my mistake.

Where I have pi you will have louis.

Try that.

Don't forget to edit the settings.js file too and restart `node-red``.

10

I don't understand what to do with the settings.js

11

You need to edit it.

Find the line with httpStatic in it and set the path - as shown, but change pi to louis

Then make the directory public in the .node-red directory.

12

I work directly with a mouse and keyboard on the Raspberry Pi. I see the settings.js file located in the /home/louis/.nodered folder.

13

Please set the debug nodes to Output Complete Message and show us the output for each of them.

14

I'm confused.

I work directly with a mouse and keyboard on the Raspberry Pi.

So why do you need to use putty to get to it?

First off:

mkdir public

Then edit the settings.js file.
eg:
nano settings.js
Then scroll down and find the line httpStatic
Change the line and save.
then put a copy of the file you want to play in that directory.

15

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16

Ok, but you will need to remove the two leading // as they make the line a comment.

And have another look at the path.

Then look at what I posted.

There IS a difference - beyond the pi/louis part.

Ok, looking at the other lines, I may be wrong.

THIS IS NOW BEYOND MY KNOWLEDGE BASE.

17

Just to be sure

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18

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19

THIS IS NOW BEYOND MY KNOWLEDGE BASE.

Sorry.

20

I am making a kind of Steady Hand Game with a Siemens Logo. When the spiral is touched, a buzzer sounds, which is controlled by the Logo. At the end of the game, the ring makes contact with a separate input on the Logo.

After that, a hoho.mp3 sound clip should play.
I already tried this with the 'Audio Out' in Node-RED, but it played through my PC speakers instead of the Raspberry Pi.
I’m almost at my wit’s end, and I’m not very experienced with programming in Putty yet.