working on bluetooth

loc_chain_app/lib/main.dart

@@ -6,7 +6,7 @@ import 'dart:math';
 void main() async {
   runApp(App());
   final prefs = await SharedPreferences.getInstance();
-  final id = prefs.getString('id') ?? '0';
+  final userName = prefs.getString('userName') ?? '0';
   if (id == '0') {
     prefs.setString('id', Random().nextInt(10000).toString());
   }

loc_chain_app/lib/pages/bluetooth.dart

@@ -31,10 +31,10 @@ class _BluetoothPageState extends State<BluetoothPage> {
           child: Text("GetID"),
           onPressed: () async {
             final prefs = await SharedPreferences.getInstance();
-            final id = prefs.getString('id');
+            final userName = prefs.getString('userName');
 
             ScaffoldMessenger.of(context)
-                .showSnackBar(SnackBar(content: Text("Id is $id")));
+                .showSnackBar(SnackBar(content: Text("Id is $userName")));
           },
         ),
       ),

loc_chain_app/lib/util/bluetooth.dart

@@ -7,4 +7,41 @@ import 'package:nearby_connections/nearby_connections.dart';
 
 import 'package:shared_preferences/shared_preferences.dart';
 
-class Connect {}
+class Connect {
+  void startConnect() async {
+    final prefs = await SharedPreferences.getInstance();
+    final userName = prefs.getString('userName') ?? " ";
+    final Strategy strategy = Strategy.P2P_STAR;
+    final serviceId = "com.yourdomain.appname";
+
+    try {
+      bool advertise = await Nearby().startAdvertising(
+        userName,
+        strategy,
+        onConnectionInitiated: (String id, ConnectionInfo info) {
+          // Called whenever a discoverer requests connection
+        },
+        onConnectionResult: (String id, Status status) {
+          // Called when connection is accepted/rejected
+        },
+        onDisconnected: (String id) {
+          // Callled whenever a discoverer disconnects from advertiser
+        },
+        serviceId: serviceId, // uniquely identifies your app
+      );
+      bool discovery = await Nearby().startDiscovery(
+        userName,
+        strategy,
+        onEndpointFound: (String id, String userName, String serviceId) {
+          // called when an advertiser is found
+        },
+        onEndpointLost: (String? id) {
+          //called when an advertiser is lost (only if we weren't connected to it )
+        },
+        serviceId: serviceId, // uniquely identifies your app
+      );
+    } catch (exception) {
+      // platform exceptions like unable to start bluetooth or insufficient permissions
+    }
+  }
+}