add sample server

package.json

@@ -0,0 +1,16 @@
+{
+  "name": "node-opcua-sampleserver",
+  "version": "0.0.10",
+  "description": "Simple OPCUA Server made with node-opcua",
+  "main": "server.js",
+  "dependencies": {
+    "node-opcua": "~0.0.10"
+  },
+  "devDependencies": {},
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "node server.js"
+  },
+  "author": "Etienne Rossignon <etienne.rossignon@gadz.org>",
+  "license": "MIT"
+}

server.js

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+var opcua  = require("node-opcua");
+
+// Let create an instance of OPCUAServer
+var server = new opcua.OPCUAServer({
+    port: 1234 // the port of the listening socket of the server
+});
+
+// we can set the buildInfo
+server.buildInfo.productName = "MySampleServer1";
+server.buildInfo.buildNumber = "7658";
+server.buildInfo.buildDate = new Date(2014,5,2);
+
+
+// the server needs to be initialized first. During initialisation,
+// the server will construct its default namespace.
+server.initialize(function() {
+
+    console.log("initialized");
+
+    // we can now extend the default name space with our variables
+    construct_my_address_space(server);
+
+    // we can now start the server
+    server.start(function() {
+        console.log("Server is now listening ... ( press CTRL+C to stop)");
+        var endpointUrl = server.endpoints[0].endpointDescription().endpointUrl;
+        console.log(endpointUrl);
+    })
+
+});
+
+
+function construct_my_address_space(server) {
+    // we create a new folder under RootFolder
+    server.engine.createFolder("RootFolder", { browseName: "MyDevice"});
+
+    // now let's add first variable in folder
+    // the addVariableInFolder
+    var variable1 = 10.0;
+
+    server.nodeVariable1 = server.engine.addVariableInFolder("MyDevice",
+        {
+            nodeId: "ns=4;b=1020ffaa", // some opaque NodeId in namespace 4
+            browseName: "MyVariable1",
+            value: {
+                get: function () {
+                    var t = new Date() / 10000.0;
+                    var value = variable1 + 10.0*Math.sin(t);
+                    return new opcua.Variant({dataType: opcua.DataType.Double, value: value });}
+            }
+        });
+
+    ///
+    var variable2 = 10.0;
+
+    server.nodeVariable2 = server.engine.addVariableInFolder("MyDevice",
+        {
+            browseName: "MyVariable2",
+            value: {
+                get: function () {
+                    return new opcua.Variant({dataType: opcua.DataType.Double, value: variable2 });
+                },
+                set: function (variant) {
+                    variable2 = parseFloat(variant.value);
+                    return opcua.StatusCodes.Good;
+                }
+            }
+        });
+
+
+
+    var os = require("os");
+    server.nodeVariable3 = server.engine.addVariableInFolder("MyDevice",
+        {
+            nodeId: "ns=4;b=1020ffab", // some opaque NodeId in namespace 4
+            browseName: "MyVariable3",
+            value: {
+                get: function () {
+                    // var value = process.memoryUsage().heapUsed / 1000000;
+                    var percentageMemUsed = os.freemem() / os.totalmem() * 100.0;
+                    value = percentageMemUsed;
+                    return new opcua.Variant({dataType: opcua.DataType.Double, value: value });}
+            }
+        });
+
+}