Network Tables

lib/globals.dart

@@ -1,20 +0,0 @@
-library;
-
-import "package:nt4/nt4.dart";
-
-NT4Client ntClient = NT4Client(serverBaseAddress: '10.5.78.2', onConnect: () { print("NT4 Connected"); }, onDisconnect: () { print("NT4 Disconnected"); });
-
-Map<String, NT4Subscription> nt4Subscriptions = {};
-
-NT4Subscription subscribe(String topic){
-
-  if (!nt4Subscriptions.containsKey(topic))
-  {
-    NT4Subscription subscrip = ntClient.subscribe(topic, NT4SubscriptionOptions());
-    nt4Subscriptions[topic] = subscrip;
-  }
-
-  return nt4Subscriptions[topic]!;
-}
-
-List<NT4Topic> nt4Topics = [];

lib/main.dart

@@ -1,12 +1,16 @@
+import 'package:helm/ntutils.dart';
+
 import 'pages/dashboard.dart';
 import 'package:flutter/material.dart';
 
 void main() {
-  runApp(const MyApp());
+  runApp(MyApp());
 }
 
 class MyApp extends StatelessWidget {
-  const MyApp({super.key});
+  MyApp({super.key}){
+    NTUtils().connect("10.5.78.2");
+  }
 
   // This widget is the root of your application.
   @override

lib/ntutils.dart

@@ -0,0 +1,59 @@
+import "package:nt4/nt4.dart";
+
+class NTUtils{
+
+  static final NTUtils _instance = NTUtils._internal();
+
+  factory NTUtils() {
+    return _instance;
+  }
+
+  bool isConnected = false;
+  bool _isAttemptingToConnect = false;
+  String _serverAddress = "";
+
+  NT4Client? ntClient; 
+
+  final Map<String, NT4Subscription> _nt4Subscriptions = {};
+
+  void connect(String serverAddress){
+    _serverAddress = serverAddress;
+    _isAttemptingToConnect = true;
+    ntClient = NT4Client(serverBaseAddress: serverAddress, onConnect: () { isConnected = true; _isAttemptingToConnect = false; }, onDisconnect: () { isConnected = false; });
+  }
+
+  String connectionStatus(){
+    if(_isAttemptingToConnect){
+      return "Attempting to connect to $_serverAddress";
+    }
+    if(isConnected){
+      return "Connected";
+    }else{
+      return "Not Connected";
+    }
+  }
+  
+  NT4Subscription subscribe(String topic){
+    if (!_nt4Subscriptions.containsKey(topic))
+    {
+      NT4Subscription subscrip = ntClient!.subscribe(topic, NT4SubscriptionOptions());
+      _nt4Subscriptions[topic] = subscrip;
+    }
+  
+    return _nt4Subscriptions[topic]!;
+  }
+  
+  final Map<String, NT4Topic> _nt4Topics = {};
+
+  NT4Topic getPublicTopic(String topic, String type){
+    if(!_nt4Topics.containsKey(topic)){
+      NT4Topic top = ntClient!.publishNewTopic(topic, type);
+      _nt4Topics[topic] = top;
+    }
+
+    return _nt4Topics[topic]!;
+  }
+
+  NTUtils._internal();
+}
+

lib/pages/dashboard.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:helm/ntutils.dart';
 import 'package:helm/widgets/base_card.dart';
 import 'package:responsive_grid/responsive_grid.dart';
 import '../widgets/text_card.dart';
@@ -22,7 +23,7 @@ class Dashboard extends StatelessWidget {
         backgroundColor: Theme.of(context).colorScheme.inversePrimary,
         // Here we take the value from the MyHomePage object that was created by
         // the App.build method, and use it to set our appbar title.
-        title: Text("Helm"),
+        title: Text("Helm - ${NTUtils().connectionStatus()}"),
       ),
       body: ResponsiveGridRow(
         children: [

lib/widgets/text_card.dart

@@ -1,7 +1,7 @@
 import 'package:flutter/material.dart';
 import './base_card.dart';
 import 'package:nt4/nt4.dart';
-import '../globals.dart' as glob;
+import 'package:helm/ntutils.dart';
 
 class TextCard extends StatefulWidget {
   const TextCard({
@@ -31,8 +31,10 @@ class _TextCardState extends State<TextCard> {
 
   @override
   Widget build(BuildContext context) {
-    NT4Subscription sub = glob.subscribe(widget.ntTopic!);
+    if(NTUtils().isConnected){
+      NT4Subscription sub = NTUtils().subscribe(widget.ntTopic!);
       sub.listen( (data) => setVal(data.toString()) );
+    }
 
     return BaseCard(
       cardTitle: widget.cardTitle,