node-red-contrib-opcua/opcua/106-opcuaevent.js

A Node-RED node to communicate via OPC UA based on node-opcua library.

/**

 Copyright 2016 Valmet Automation Inc.

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.

 **/

module.exports = function (RED) {
    "use strict";
    var opcua = require('node-opcua');
    var opcuaBasic = require('./opcua-basics');

    function OpcUaEventNode(n) {

        RED.nodes.createNode(this, n);

        this.root = n.root; // OPC UA item nodeID
        this.eventtype = n.eventtype; // eventType
        this.name = n.name; // Node name

        var node = this;

        node.on("input", function (msg) {

            // var baseEventTypeId = "i=2041";
            // var serverObjectId = "ns=0;i=2253";
            // All event field, perhaps selectable in UI

            var basicEventFields = opcuaBasic.getBasicEventFields();
            var eventFilter = opcua.constructEventFilter(basicEventFields);

            msg.topic = node.root; // example: ns=0;i=85;
            msg.eventFilter = eventFilter;
            msg.eventFields = basicEventFields;
            msg.eventTypeIds = node.eventtype; // example: ns=0;i=10751;

            node.send(msg);
        });
    }

    RED.nodes.registerType("OpcUa-Event", OpcUaEventNode);
};