var server = new opcua.OPCUAServer({
            port: 1234
    });

    server.buildInfo.productName ="Rapsberry OPCUA Server"

    function post_initialize() {

            var addressSpace = server.engine.addressSpace;
            var devices = addressSpace.addFolder("ObjectsFolder",{ browseName: "Devices"});
            var temperatureSensor = "28-041460c2a3ff";
            install_sensor(temperatureSensor);
    };

    var tempValue = -20.0;
    var tempValue1 = -20.0;
    var humValue = -20.0;

    function install_sensor(sensor) {
            var addressSpace = server.engine.addressSpace;
            var sensorName = "ds18b20";
            var sensorName1 = "dht11";
            var devices = addressSpace.rootFolder.objects.devices;
            var sensor  = addressSpace.addObject({
                    organizedBy: devices,
                    browseName:  sensorName
            });

            var dht = new rpiDhtSensor.DHT11(27);

            setInterval(function() {
                    var temperatureSensor = "28-041460c2a3ff";
                    read_sensor(temperatureSensor,function(err,result) {
                            tempValue = result.value;
                    });
                    var readout = dht.read();
                    tempValue1 = readout.temperature.toFixed(2);
                    humValue = readout.humidity.toFixed(2);
            },3000);

            addressSpace.addVariable({
                    propertyOf: sensor,
                    browseName: "temperature1",
                    dataType:   "Double",
                    value: {
                            get: function () {
                                    return new opcua.Variant({dataType: opcua.DataType.Double, value: tempValue });
                            }
                    }
            });

            addressSpace.addVariable({
                    propertyOf: sensor,
                    browseName: "temperature2",
                    dataType:   "Double",
                    value: {
                            get: function () {
                                    return new opcua.Variant({dataType: opcua.DataType.Double, value: tempValue1 });
                            }
                    }
            });

            addressSpace.addVariable({
                    propertyOf: sensor,
                    browseName: "humidity",
                    dataType: "Double",
                    value: {
                            get: function() {
                                    return new opcua.Variant({dataType: opcua.DataType.Double, value: humValue });
                            }
                    }
            });
    };

    server.initialize(post_initialize);

    server.start(function() {
            console.log("\n\nTemperature - OPCUAServer");
            var endpointUrl = server.endpoints[0].endpointDescriptions()[0].endpointUrl;
            console.log("Server endpoint url is ", endpointUrl );
            console.log("\n");
    });