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node-red-nodes/utility/daemon
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Dave C-J 3e21d7d730 New Daemon node to call and monitor long running external commands
2014-12-24 21:51:17 +00:00
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daemon.html New Daemon node to call and monitor long running external commands 2014-12-24 21:51:17 +00:00
daemon.js New Daemon node to call and monitor long running external commands 2014-12-24 21:51:17 +00:00
LICENSE New Daemon node to call and monitor long running external commands 2014-12-24 21:51:17 +00:00
package.json New Daemon node to call and monitor long running external commands 2014-12-24 21:51:17 +00:00
README.md New Daemon node to call and monitor long running external commands 2014-12-24 21:51:17 +00:00

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.

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.

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