通过TCP/IP发送数据包还是应该使用一个应用协议来发送？

你好，我想在PIC32 MX795F512L上开发一个Modbus TCP协议，所以我开始了解Modbus是如何工作的，现在我试图理解TCP/IP协议栈。从我理解的，我必须要使用一个应用层协议（Modbus TCP），所以我想测试TCP/IP协议栈。首先，我发现了很多例子，我试图理解它们，阅读HARMOY TCP/IP堆栈的文档，但是我找不到我正在寻找的东西（也许我在文档中找不到）。我测试了Web服务器示例和IP分配示例，并且它们工作。所以，我想发送一个数据包。从TCP，然后试图从WiReSARK中捕获它，所以我想知道：1）我可以通过TCP发送任何数据包，还是应该使用一个应用协议来发送它？2）如果我可以通过TCP发送任何数据包，有什么例子可以解释这个问题吗？我只想知道如何通过TCP/IP发送数据而不使用指定的协议。谢谢。



      以下为原文

    Hi,
I want to develop a Modbus TCP protocol on PIC32MX795F512L, so i started to understand how does modbus work, and now i am trying to understand the TCP/IP stack in harmony.
From what i understood, I have to implment an application layer protocol (MODBUS TCP), so i thought to test the TCP/IP stack first.
I found many examples, I tried to understand them and read the documentaion of harmoy tcp/ip stack, but i can't find what i am looking for (maybe i can't find it in the documentation).
I tested the web server example and the ip assignment example and they working.

So, I thought to send a packet from tcp, then trying to capture it from wireshark, so i want to know:
1) Can i send any packet over TCP or should i use an application protocol to send it?
2) If i can send any packet over tcp, is there any example which explain this?

I just want to know how to send a data over tcp/ip without using a specified protocol.
Thanks.