History

Dave Conway-Jones 059c7a2d67 slight update to daemon node words to clarify arguments		2015-09-02 10:56:32 +01:00
..
LICENSE	New Daemon node to call and monitor long running external commands	2014-12-24 21:51:17 +00:00
README.md	slight update to daemon node words	2015-09-02 10:56:32 +01:00
daemon.html	slight update to daemon node words	2015-09-02 10:56:32 +01:00
daemon.js	New Daemon node to call and monitor long running external commands	2014-12-24 21:51:17 +00:00
package.json	slight update to daemon node words	2015-09-02 10:56:32 +01:00

README.md

node-red-node-daemon

A Node-RED node that runs and monitors a long running system command.

Similar to the exec node - but this calls the command at start time and then pipes any input to the node to the STDIN of the running command, and feeds any STDOUT to the first output.

Useful for monitoring command line based processes.

Install

Run the following command in the root directory of your Node-RED install

npm install node-red-node-daemon

Usage

Calls out to a long running system command. Sends msg.payload to stdin of the process.

Note Only the command itself should be placed in the command field. All parameters must be placed in the arguments field.

The command provides 3 outputs... stdout, stderr, and return code, from the running command.

If the called program stops (i.e. a return code is produced), this node can attempt to restart the command automatically.

Note : when you stop Node-RED running we may not get a chance to kill the called program so it may remain running. You may have to kill it manually.

For example it can be used to run and then monitor the dump1090 plane spotter, and also to interact with various python apps that everyone seem to write these days :-)