OpenZWave nodes for node-red
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README.md

Decription

OpenZWave nodes for Node-Red ( http://nodered.org/ ). Uses the shared OpenZWave addon for Node.js ( https://github.com/OpenZWave/node-openzwave-shared ). Integrating this node onto your Node-Red installation enables you to have bidirectional integration with ZWave networks, ie you can:

  • send commands to ZWave devices by sending special command messages in Node-Red flows
  • have ZWave devices report their status as messages injected into Node-Red flows as feedback

Installation

This package has one sole dependency: node-openzwave-shared. This is a fork of node-openzwave that links to OpenZWave as a shared library, therefore you need to have the OpenZWave library installed in your system beforehand, using the operating system's package manager, or by compiling OpenZWave yourself.

So, first make sure you have the OpenZWave library installed on your system, as outlined in the 'preprequisites' section on openzwave-shared README, then use npm install within your Node-Red user folder:

$ cd ~/.node-red
$ npm install node-red-contrib-openzwave

Persisting ZWave configuration in zwcfg_xxx.xml files

Its more than probable that you have included battery-powered ZWave nodes in your installation. When you include battery devices (using the 'addNode()' method), OpenZWave needs to persist their configuration to a file, otherwise all metadata about them (make and model, available command classes etc) will be lost when you restart node. Therefore you need to tell OpenZWave to write out the known facts about the ZWave nodes into a XML file. You can do that by using writeConfig() to store that XML file whenever you add/edit/remove nodes.

This file is named zwcfg_xxx.xml where the xxx is a hex number corresponding to your ZWave controller's unique home ID. The necessary config setting is UserPath and its value defines the location of that XML file. The value is printed out upon loading up the NodeJS module:

Initialising OpenZWave 1.4.79 binary addon for Node.JS.
        OpenZWave Security API is ENABLED
        ZWave device db    : /usr/etc/openzwave
        User settings path : /home/pi/.node-red

In the example above, the node-red-contrib-openzwave plugin
is initialising the UserPath to be the user settings directory for NodeRed.

      ozwDriver = new OpenZWave({
        Logging: (logging != "off"),
        ConsoleOutput: (logging != "off"),
        QueueLogLevel: ((logging == "full") ? 8 : 6),
        UserPath: RED.settings.userDir,
        DriverMaxAttempts: cfg.driverattempts
      });

The value for userDir can be overridden in the settings.js file used by Node-Red.

Nodes added to Node-Red by this package

- zwave-controller

This is a config node whose job is to hold the necessary data for initializing OpenZWave and act as the encapsulator for access to the OpenZWave API. When you add a 'zwave-in' or 'zwave-out' into your flows, a singleton instance of this node is created in the background, and you need to click on the 'controller' icon, in order to configure where your ZWave USB controller is connected to (for example /dev/ttyUSB0 in Linux) and define a logging level.

- zwave-in

A node that emits ZWave events as they are emitted from the ZWave controller. Use this node to get status feedback about what is happening in real time in your ZWave network. For example, the following message is injected into the NR flow when ZWave node #9, a binary switch, is turned on:

{ "topic":"zwave: value changed",
  "payload":{
    "nodeid":9,
    "cmdclass":37,
    "instance":1,
    "cmdidx":0,
    "oldState":false,
    "currState":true}}
- zwave-out

Use this node to send arbitrary commands to the ZWave appliances. The four most common commands you're going to use are:

  • {topic: 'switchOn', payload: {"nodeid":2}} ==> to switch on basic switch on ZWave node #2

  • {topic: 'switchOff', payload: {"nodeid":2}} ==> to switch off basic switch on ZWave node #2

  • {topic: 'setLevel', payload: {"nodeid": 5, "value": 50}} ==> set level on dimmer on ZWave node #5 to 50%

  • {topic: 'setValue', payload: {"nodeid":5, "cmdclass":38, "value":50}} ==> same effect as above, set dimmer on ZWave node #5 to 50% using command class 38 (cmdClassSwitchMultilevel)

The setValue topic is the most flexible, as you can send arbitrary ZWave values to the unlderlying OpenZWave library. Currently only "plain/basic" datatypes are supported (ints, floats etc), more complex ones, eg values with units such as thermostat setpoints are not yet supported. Use this topic (setValue) to control multi-instance devices (such as the Fibaro FGS-221), where one single ZWave node controls multiple endpoints/relays. To control such devices, simply specify a valid instance (0 or 1 for the FGS-221):

  • {topic: 'setValue', payload: {"nodeid":8, "instance":1, "value":1}} ==> switch on the 2nd relay of multiswitch #8

Click here for a full list of ZWave command classes.

Important note: You should wait for a message with topic of scan complete when booting up your flow, before you start sending commands to ZWave, otherwise your commands will be ignored.

Support for the full OpenZWave API:

You can invoke the full OpenZWave::Manager API, as long as the command is supported by openzwave-shared (see this source file for a list of supported commands). You should also consult the official OpenZWave::Manager class documentation.

The Node-Red message should have

  • topic: set to the OpenZWave::Manager method name (eg. healNetwork). Method names are the same as in the official API, except the first letter is in lower case.
  • payload: an array of the command arguments in the correct order.

Some examples:

  • to add a new ZWave node to your network, you need to prepend the ZWave Home ID to the addNode() management call as follows:

{"topic": "addNode", "payload": {"prependHomeId": true}}

  • to enable polling for ZWave node #5 for the on-off command class (0x25 == decimal 37). Notice that the EnablePoll() command does not need a HomeId as an argument, hence we don't need to add prependHomeId to the message payload:

{"topic": "enablePoll", "payload": {"args": [5, 37]}}

  • to get statistics from node 2 by using the getNodeStatistics() call:

{"topic": "getNodeStatistics", "payload": {"args": [2]}}

Most of the API calls in OpenZWave are asynchronous. This means that you don't get an immediate result value from the call itself, but you'll get notifications from their activity on the zwave-in input node. However, there are some direct API calls which do return a value (eg the getNodeStatistics is returning an object populated with the node's statistics: number of packets sent/received, transmission error counts etc).

In this case, the result is appended to the message payload and forwarded to the output of the ZWave-out node. This is the only message that the zwave-out node is emitting.

Example

Here's an example flow, that uses its sibling KNX for Node-Red project ( https://github.com/ekarak/node-red-contrib-eibd ) to bind KNX and ZWave together as one happy home automation network:

openzwave example