prisme-flow/nodes/bridge/opcua/opcuaitem.js

prisme platform flow engine

/**
 * Created by prisme.io on 09/06/2017.
 */


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

    function OpcUaItemNode(n) {

        RED.nodes.createNode(this, n);

        this.item = n.item;         // OPC UA address: ns=2;i=4 OR ns=3;s=MyVariable
        this.datatype = n.datatype; // String;
        this.value = n.value;       // 66.6
        this.name = n.name;         // browseName shall be put here

        var node = this;

        function verbose_warn(logMessage) {
            if (RED.settings.verbose) {
                node.warn((node.name) ? node.name + ': ' + logMessage : 'OpcUaClientNode: ' + logMessage);
            }
        }

        function verbose_log(logMessage) {
            if (RED.settings.verbose) {
                node.log(logMessage);
            }
        }

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

            msg.topic = node.item;
            msg.datatype = node.datatype;
            msg.browseName = node.name;

            verbose_log('node value:' + node.value);

            if (node.value) {
				if (node.datatype) {
					msg.payload = opcuaBasics.build_new_value_by_datatype(node.datatype, node.value);
				}
				if (msg.datatype) {
					msg.payload = opcuaBasics.build_new_value_by_datatype(msg.datatype, node.value);
				}
                verbose_warn("setting value by Item " + msg.payload);
            } else {
                msg.payload = opcuaBasics.build_new_value_by_datatype(msg.datatype, msg.payload);
                verbose_warn("setting value by Input " + msg.payload);
            }

            node.send(msg);
        });
    }

    RED.nodes.registerType("OpcUa-Item", OpcUaItemNode);
};