multicast/broadcast support

lib/models/project.dart

@@ -7,34 +7,54 @@ part 'project.g.dart';
 class Project {
   final String id;
   final String name;
-  final String ipAddress;
+  
+  // Support for multiple IP addresses at project level
+  final List<String> ipAddresses;
+  
+  // Broadcast mode flag for project
+  @JsonKey(defaultValue: false)
+  final bool isBroadcast;
+  
   final int port;
   final List<UdpPackage> packages;
+  
+  // Legacy field for backward compatibility
+  @JsonKey(includeFromJson: true, includeToJson: false)
+  final String? ipAddress;
 
   Project({
     required this.id,
     required this.name,
-    required this.ipAddress,
+    List<String>? ipAddresses,
+    this.isBroadcast = false,
     required this.port,
     required this.packages,
-  });
+    this.ipAddress,
+  }) : ipAddresses = ipAddresses ?? (ipAddress != null ? [ipAddress] : ['127.0.0.1']);
 
-  factory Project.fromJson(Map<String, dynamic> json) =>
-      _$ProjectFromJson(json);
+  factory Project.fromJson(Map<String, dynamic> json) {
+    // Handle migration from old format
+    if (json.containsKey('ipAddress') && !json.containsKey('ipAddresses')) {
+      json['ipAddresses'] = [json['ipAddress']];
+    }
+    return _$ProjectFromJson(json);
+  }
 
   Map<String, dynamic> toJson() => _$ProjectToJson(this);
 
   Project copyWith({
     String? id,
     String? name,
-    String? ipAddress,
+    List<String>? ipAddresses,
+    bool? isBroadcast,
     int? port,
     List<UdpPackage>? packages,
   }) {
     return Project(
       id: id ?? this.id,
       name: name ?? this.name,
-      ipAddress: ipAddress ?? this.ipAddress,
+      ipAddresses: ipAddresses ?? this.ipAddresses,
+      isBroadcast: isBroadcast ?? this.isBroadcast,
       port: port ?? this.port,
       packages: packages ?? this.packages,
     );

lib/models/project.g.dart

@@ -9,17 +9,22 @@ part of 'project.dart';
 Project _$ProjectFromJson(Map<String, dynamic> json) => Project(
   id: json['id'] as String,
   name: json['name'] as String,
-  ipAddress: json['ipAddress'] as String,
+  ipAddresses: (json['ipAddresses'] as List<dynamic>?)
+      ?.map((e) => e as String)
+      .toList(),
+  isBroadcast: json['isBroadcast'] as bool? ?? false,
   port: (json['port'] as num).toInt(),
   packages: (json['packages'] as List<dynamic>)
       .map((e) => UdpPackage.fromJson(e as Map<String, dynamic>))
       .toList(),
+  ipAddress: json['ipAddress'] as String?,
 );
 
 Map<String, dynamic> _$ProjectToJson(Project instance) => <String, dynamic>{
   'id': instance.id,
   'name': instance.name,
-  'ipAddress': instance.ipAddress,
+  'ipAddresses': instance.ipAddresses,
+  'isBroadcast': instance.isBroadcast,
   'port': instance.port,
   'packages': instance.packages,
 };

lib/models/udp_package.dart

@@ -7,17 +7,34 @@ class UdpPackage {
   final String id;
   final String name;
   final String data;
-  final String ipAddress;
+  
+  // Support for multiple IP addresses
+  final List<String> ipAddresses;
+  
+  // Broadcast mode flag
+  @JsonKey(defaultValue: false)
+  final bool isBroadcast;
+  
+  // Legacy field for backward compatibility - kept for migration
+  @JsonKey(includeFromJson: true, includeToJson: false)
+  final String? ipAddress;
 
   UdpPackage({
     required this.id,
     required this.name,
     required this.data,
-    required this.ipAddress,
-  });
+    List<String>? ipAddresses,
+    this.isBroadcast = false,
+    this.ipAddress,
+  }) : ipAddresses = ipAddresses ?? (ipAddress != null ? [ipAddress] : ['127.0.0.1']);
 
-  factory UdpPackage.fromJson(Map<String, dynamic> json) =>
-      _$UdpPackageFromJson(json);
+  factory UdpPackage.fromJson(Map<String, dynamic> json) {
+    // Handle migration from old format
+    if (json.containsKey('ipAddress') && !json.containsKey('ipAddresses')) {
+      json['ipAddresses'] = [json['ipAddress']];
+    }
+    return _$UdpPackageFromJson(json);
+  }
 
   Map<String, dynamic> toJson() => _$UdpPackageToJson(this);
 
@@ -25,13 +42,15 @@ class UdpPackage {
     String? id,
     String? name,
     String? data,
-    String? ipAddress,
+    List<String>? ipAddresses,
+    bool? isBroadcast,
   }) {
     return UdpPackage(
       id: id ?? this.id,
       name: name ?? this.name,
       data: data ?? this.data,
-      ipAddress: ipAddress ?? this.ipAddress,
+      ipAddresses: ipAddresses ?? this.ipAddresses,
+      isBroadcast: isBroadcast ?? this.isBroadcast,
     );
   }
 }

lib/models/udp_package.g.dart

@@ -10,7 +10,11 @@ UdpPackage _$UdpPackageFromJson(Map<String, dynamic> json) => UdpPackage(
   id: json['id'] as String,
   name: json['name'] as String,
   data: json['data'] as String,
-  ipAddress: json['ipAddress'] as String,
+  ipAddresses: (json['ipAddresses'] as List<dynamic>?)
+      ?.map((e) => e as String)
+      .toList(),
+  isBroadcast: json['isBroadcast'] as bool? ?? false,
+  ipAddress: json['ipAddress'] as String?,
 );
 
 Map<String, dynamic> _$UdpPackageToJson(UdpPackage instance) =>
@@ -18,5 +22,6 @@ Map<String, dynamic> _$UdpPackageToJson(UdpPackage instance) =>
       'id': instance.id,
       'name': instance.name,
       'data': instance.data,
-      'ipAddress': instance.ipAddress,
+      'ipAddresses': instance.ipAddresses,
+      'isBroadcast': instance.isBroadcast,
     };