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code/vdes_utils/vdes_message_packaged.py

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+import struct
+import socket
+import time
+from fuadmin import settings
+
+class VdesMessagePackaged:
+    """VDES消息打包工具类"""
+    def __init__(self, Message, MMSI):
+        self.message = Message
+        self.MMSI = int(MMSI)
+        self.chunk_size = 32755
+        self.host = getattr(settings, 'VDES_MONITOR_HOST', 'localhost')
+        self.port = getattr(settings, 'VDES_MONITOR_PORT', 8083)
+        self.buffer_size = getattr(settings, 'VDES_BUFFER_SIZE', 4096)
+
+
+    def create_tcp_packet(self, packet_type, content):
+        """创建符合VDES TCP协议的报文"""
+        # 报文帧头 (4字节)
+        header = b'####'
+        
+        # 报文类型 (4字节，大端)
+        type_field = struct.pack('>I', packet_type)
+        
+        # 报文长度 (4字节，大端，内容长度)
+        length = len(content)
+        length_field = struct.pack('>I', length)
+        
+        # 构建完整报文
+        packet = header + type_field + length_field + content
+        return packet
+    
+    #长消息起始片段
+    def long_message_start_frame(self, target_mmsi, send_priority):
+        data_type = 0                #数据类型
+        target_MMSI = target_mmsi    #目标MMSI
+        priority = send_priority     #优先级
+        # 打包为二进制 (大端字节序)
+        content = struct.pack('>BIB', data_type, target_MMSI, priority)
+        return content
+    
+    #长消息延续片段
+    def long_message_middle_frame(self, valid_binary_data):
+        data_type = 1         #数据类型
+        data = valid_binary_data     #有效数据
+        # 打包为二进制 (大端字节序)
+        content = struct.pack('>B', data_type) + data
+        return content
+    
+    #长消息结束片段
+    def long_message_end_frame(self):
+        data_type = 2         #数据类型
+        # 打包为二进制 (大端字节序)
+        content = struct.pack('>B', data_type)
+        return content
+
+    def create_message_packet(self, message, target_mmsi, send_priority):
+        binary_data = message.encode('utf-8')
+        message_frames = []
+        if len(binary_data) < 4:
+            print("使用短消息，编码后的字节数小于4字节")
+            return message_frames
+        else:
+            print(f"使用长消息编码后的字节数为{len(binary_data)}字节")
+            
+            chunks = [binary_data[i:i+self.chunk_size] 
+                for i in range(0, len(binary_data), self.chunk_size)]
+            # 3. 检查总长度限制
+            
+            if len(binary_data) > 256 * 1024:
+                raise ValueError("总数据长度超过256KB限制") 
+            start_frame = self.long_message_start_frame(target_mmsi, send_priority)
+            message_frames.append(self.create_tcp_packet(10, start_frame))
+            for chunk in chunks:
+                middle_frame = self.long_message_middle_frame(chunk)
+                message_frames.append(self.create_tcp_packet(10, middle_frame))
+            end_frame = self.long_message_end_frame()
+            message_frames.append(self.create_tcp_packet(10, end_frame))
+            return message_frames
+
+    def send_message(self):
+        """启动Socket服务端"""  
+        Target_MMSI = self.MMSI  # 示例目标MMSI
+        Send_Priority = 1  # 示例发送优先级 
+        message = self.message
+        message_frames = self.create_message_packet(message, Target_MMSI, Send_Priority)
+        with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
+            try:
+                sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+                sock.connect((self.host, self.port))
+                print(f"Socket服务端已启动，监听 {self.host}:{self.port}")
+                try:
+                    for message_frame in message_frames:
+                        print(f"发送报文: {message_frame.hex()}")
+                        sock.sendall(message_frame)
+                        # print("二进制表示:", ' '.join(format(byte, '08b') for byte in message_frame))
+                        time.sleep(0.5)
+                    # time.sleep(3)
+
+                    sock.shutdown(socket.SHUT_WR)
+                    sock.close()
+                
+                except (ConnectionResetError, BrokenPipeError):
+                    print("客户端断开连接")
+                        
+            except KeyboardInterrupt:
+                print("\n服务端已停止")
+
+            except Exception as e:
+                print(f"服务端错误: {e}")
+
+
+
+# if __name__ == "__main__":
+#     send_message()