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41 lines
1.4 KiB
Markdown
41 lines
1.4 KiB
Markdown
node-red-node-daemon
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====================
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A <a href="http://nodered.org" target="_new">Node-RED</a> node that runs and
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monitors a long running system command.
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Similar to the **exec** node - but this calls the command at start time and
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then pipes any input to the node to the STDIN of the running command, and feeds
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any STDOUT to the first output.
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Useful for monitoring command line based processes.
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Install
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-------
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Run the following command in the root directory of your Node-RED install
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npm install node-red-node-daemon
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Usage
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-----
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Calls out to a long running system command. Sends <b>msg.payload</b> to stdin of the process.
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**Note** Only the command itself should be placed in the command field.
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All parameters **must** be placed in the arguments field.
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The command provides 3 outputs... stdout, stderr, and return code, from the running command.
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If the called program stops (i.e. a return code is produced), this node can attempt
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to restart the command automatically.
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**Note :** when you stop Node-RED running we may not get a chance to kill the
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called program so it may remain running. You <i>may</i> have to kill it manually.
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For example it can be used to run and then monitor the
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<a href="https://github.com/antirez/dump1090" target="_new">dump1090</a> plane
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spotter, and also to interact with various python apps that everyone seem to write
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these days :-)
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