Daemon node

[Paul Reed]

Has anyone a simple example of using the daemon node to run a php script?

I'm trying to start & keep running a MQTT php class;

sudo php /var/www/emoncms/scripts/phpmqtt_input.php

I've read the node notes and searched the forum but can't find anything which makes a lot of sense at my level!

Paul

[Dave C-J]

Hi Paul,
What does that php script do ?. The daemon node should call it at start/deploy and then send anything it outputs as stdout to the top output, etc. Likewise any payload sent to the node goes to the stdin of the process.

[Paul Reed]

The script sets up the environment for emoncms to subscribe to topics via phpMQTT - here is a link.

I've attached a debug node to the top right output, put the command as above in the Command box, and every 10 seconds in the debug panel I get.

[Dave C-J]

What happens if you try to run that command from the command prompt (as the same user you are using to run niode-red) ? Or maybe need to path to php fully.

[Paul Reed]

If I run as the same user from the command prompt (without sudo) the script loads and runs OK, printing the incoming MQTT feed data. If I close SSH the script stops.

Adding the full php path was met with disdain by node-red! it would deploy declaring it 'forbidden'.

[Dave C-J]

Ah...  the command (php) needs to be the only thing in the command...

the /tmp/phpmqtt_input.php is the argument

[Paul Reed]

I think that is a step forward, now I get;

...yet the script is not actually running, as the MQTT topics are not updating.

Paul

[Dave C-J]

Paul,

I had a quick look at the php  - around line 32 it tries to create a lock file... Has that already been created an left lying around from some of the previous attempts. It doesn't seem to clean up very well in case of errors.

If I run without sudo on my mac - it fails to even create the file - yet then reports "already running" also... so not sure what it is up to.... and this is standalone... reports the same via Node-RED... over to you :-)

[Paul Reed]

Thanks for looking Dave. I'm quickly moving to plan B - writing a init file instead!