node-red-contrib-timer

node-red-contrib-timer

node-red-contrib-timer is a rudementary timer.

---

Getting Started

Prerequisites

• Node.js v12.13.0 or newer
• Node-RED v3.0.1 or newer

Installation

Install via Node-RED Manage Palette

node-red-contrib-timer

Install via npm

$ cd ~/.node-red
$ npm install node-red-contrib-timer
# then restart node-red

---

Usage

Configuration Pane

Node input

Start and stop with msg.payload:

• true starts the timer.
• false stops the timer.

Set expiry time with msg.payload:

• int sets countdown in seconds.

Examples

Using topic to filter payload when cancelled

When no topic property is defined in the node, the incoming topic is copied over to the output. This can be used to filter out the expiry payload when the timer is cancelled.

[{"id":"38a5c6e.079893a","type":"tab","label":"ignore cancel","disabled":false,"info":""},{"id":"b5e83fc7.69dc8","type":"debug","z":"38a5c6e.079893a","name":"state","active":false,"tosidebar":true,"console":false,"tostatus":true,"complete":"true","targetType":"full","statusVal":"payload","statusType":"auto","x":670,"y":140,"wires":[]},{"id":"6fb05b68.183e3c","type":"debug","z":"38a5c6e.079893a","name":"timer","active":false,"tosidebar":true,"console":false,"tostatus":true,"complete":"true","targetType":"full","statusVal":"payload","statusType":"auto","x":670,"y":200,"wires":[]},{"id":"72a3e721.0cc288","type":"inject","z":"38a5c6e.079893a","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"cancel","payload":"false","payloadType":"bool","x":134,"y":196,"wires":[["d96dea31904032b8"]]},{"id":"84f20a87.3a0308","type":"inject","z":"38a5c6e.079893a","name":"","props":[{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"true","payloadType":"bool","x":154,"y":136,"wires":[["d96dea31904032b8"]]},{"id":"48ce8bab.3c0634","type":"function","z":"38a5c6e.079893a","name":"ignore cancel","func":"if (msg.topic != 'cancel') {\n    return msg;\n}","outputs":1,"noerr":0,"initialize":"","finalize":"","x":500,"y":140,"wires":[["b5e83fc7.69dc8"]]},{"id":"225ff94.486e486","type":"comment","z":"38a5c6e.079893a","name":"Incoming message topic can be copied over to the output.","info":"","x":250,"y":40,"wires":[]},{"id":"d96dea31904032b8","type":"timer-node","z":"38a5c6e.079893a","name":"","topic":"","timer":"5","payloadOn":"false","payloadOnType":"bool","payloadOff":"true","payloadOffType":"bool","x":310,"y":160,"wires":[["48ce8bab.3c0634"],["6fb05b68.183e3c"]]},{"id":"bd55ac20a78e44fc","type":"comment","z":"38a5c6e.079893a","name":"This example uses a function node to filter out the expiry payload when timer is cancelled.","info":"","x":350,"y":80,"wires":[]}]

Message property propagation

Properties defined in the incoming msg object are copied over to the outputs. The payload is changed and topic (if defined in the node).

[{"id":"8af9695e.73126","type":"tab","label":"msg property propagation","disabled":false,"info":""},{"id":"43d996ab.f0fa48","type":"inject","z":"8af9695e.73126","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"},{"p":"foo","v":"bar","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"object copying","payload":"true","payloadType":"bool","x":190,"y":140,"wires":[["1421f228d1843b9b"]]},{"id":"c830b39e.c0c1","type":"debug","z":"8af9695e.73126","name":"timer","active":false,"tosidebar":true,"console":false,"tostatus":true,"complete":"true","targetType":"full","statusVal":"payload","statusType":"auto","x":610,"y":280,"wires":[]},{"id":"3a0fe194.c88de6","type":"debug","z":"8af9695e.73126","name":"","active":false,"tosidebar":true,"console":false,"tostatus":true,"complete":"payload","targetType":"msg","statusVal":"payload","statusType":"auto","x":630,"y":140,"wires":[]},{"id":"40a132b2.d74a8c","type":"debug","z":"8af9695e.73126","name":"","active":false,"tosidebar":true,"console":false,"tostatus":true,"complete":"foo","targetType":"msg","statusVal":"payload","statusType":"auto","x":620,"y":200,"wires":[]},{"id":"d2e4815a.235dd","type":"debug","z":"8af9695e.73126","name":"","active":false,"tosidebar":true,"console":false,"tostatus":true,"complete":"topic","targetType":"msg","statusVal":"payload","statusType":"auto","x":620,"y":80,"wires":[]},{"id":"3b550efa.cdb4aa","type":"inject","z":"8af9695e.73126","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"},{"p":"foo","v":"cis boom bah","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"object copying cancelled","payload":"false","payloadType":"bool","x":160,"y":220,"wires":[["1421f228d1843b9b"]]},{"id":"8d7ff426.ad474","type":"comment","z":"8af9695e.73126","name":"Message properties are copied over to the output.","info":"","x":200,"y":40,"wires":[]},{"id":"1421f228d1843b9b","type":"timer-node","z":"8af9695e.73126","name":"","topic":"","timer":"5","payloadOn":"false","payloadOnType":"bool","payloadOff":"true","payloadOffType":"bool","x":410,"y":180,"wires":[["d2e4815a.235dd","3a0fe194.c88de6","40a132b2.d74a8c"],["c830b39e.c0c1"]]},{"id":"c81e85b84437fd8a","type":"comment","z":"8af9695e.73126","name":"only msg.payload is changed.","info":"","x":140,"y":80,"wires":[]}]

Override msg.topic in properties

When topic is defined in the node properties, incoming msg.topic is overriden.

[{"id":"3f3d6774.cce2f","type":"tab","label":"topic override","disabled":false,"info":""},{"id":"c11b7d9c.021958","type":"inject","z":"3f3d6774.cce2f","name":"","props":[{"p":"topic","vt":"str"},{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"ignored","payload":"true","payloadType":"bool","x":150,"y":140,"wires":[["bf0781a1230c42ac"]]},{"id":"3706780.96a0c08","type":"inject","z":"3f3d6774.cce2f","name":"","props":[{"p":"topic","vt":"str"},{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"ignored","payload":"false","payloadType":"bool","x":150,"y":220,"wires":[["bf0781a1230c42ac"]]},{"id":"5d48ca08.c9c664","type":"debug","z":"3f3d6774.cce2f","name":"","active":false,"tosidebar":true,"console":false,"tostatus":true,"complete":"topic","targetType":"msg","statusVal":"payload","statusType":"auto","x":560,"y":100,"wires":[]},{"id":"4e8c7759.a6b17","type":"debug","z":"3f3d6774.cce2f","name":"timer","active":false,"tosidebar":true,"console":false,"tostatus":true,"complete":"true","targetType":"full","statusVal":"payload","statusType":"auto","x":550,"y":260,"wires":[]},{"id":"edfec9d6.4e066","type":"debug","z":"3f3d6774.cce2f","name":"","active":false,"tosidebar":true,"console":false,"tostatus":true,"complete":"payload","targetType":"msg","statusVal":"payload","statusType":"auto","x":570,"y":160,"wires":[]},{"id":"d9fa71cd.4df948","type":"comment","z":"3f3d6774.cce2f","name":"When topic is defined in node properties it overrides the incoming message topic.","info":"","x":320,"y":40,"wires":[]},{"id":"bf0781a1230c42ac","type":"timer-node","z":"3f3d6774.cce2f","name":"","topic":"override topic","timer":"5","payloadOn":"false","payloadOnType":"bool","payloadOff":"true","payloadOffType":"bool","x":350,"y":160,"wires":[["5d48ca08.c9c664","edfec9d6.4e066"],["4e8c7759.a6b17"]]}]