#连接库初步完成

lib/core/protocol/packet_entity.dart

@@ -0,0 +1,12 @@
+import 'package:equatable/equatable.dart';
+
+class PacketEntity extends Equatable{
+  final int cmdType;
+  final List<int> payload;
+  final List<int>? crc; // 心跳包可能为 null
+
+  const PacketEntity({required this.cmdType, required this.payload, this.crc});
+
+  @override
+  List<Object?> get props => [cmdType, payload, crc];
+}