python (windows) 丢弃 UDP 数据包？
我在这里看到了与其他人相同的事情：
和
< a href="https://stackoverflow.com/questions/54634889/python-dropping-udp-packet-that-wireshark-sees">Python 丢弃 WireShark 的 UDP 数据包看到
（Windows 10，Python 3.6） - 在我的例子中，我正在与设备交谈（运行LWiP的嵌入式系统） 我向它发送一系列命令（大约N = 100），每个命令都有一个UDP响应，命令往往很短，大多小于20字节，响应大小相同，但有些很大（1200字节）
有时Python不会收到响应 UDP 数据包 - 是的，我知道 UDP 不可靠{flame: ON，请不要跟我一起去那里，flame: OFF}
- 我在工作实验室的专用网络上，有最小的 交通。
- 在windows盒子上（通过wireshark）我看到了响应
- 但是-python没有看到响应。
- 该死的系统今天早上工作了，今天下午就不行了。
- 这种情况以前发生过，然后就消失了 - 然后它决定“F-you”今天是星期四，今天不起作用，只是因为......
- 我无法改变 5 人年的开发在这一点上，很多东西会变更、嵌入式代码、现场设备、测试自动化、验证脚本——大量的Python——这将是一个没有人会接受的历史性的努力水平。
我需要这种丢弃的原因更加可靠或更容易理解，而不是无缘无故地丢弃数据包。我没有简单的方法来调试为什么我的 pythons 脚本会这样做（我假设它是 python，我无法证明这一点。
在 Linux 上 - 我可以这样做 - 在 Linux 上我会使用 STRACE() 并跟踪系统调用，并查看输出日志中的返回值 - 但这是 Windows，没有 strace()
有关该问题的更多信息：
我与 LWip STACK 交谈，在循环中我向它发送一个查询，给我数据项 X 到 Y，设备响应，然后我请求下一个范围 - 根据查询的内容，在返回空列表之前有 2 到 3 个循环，
然后它突然说：“不，不会发送该数据包”。 我需要明白为什么:-(
I am seeing the same thing as others here:
Windows, UDP packets silently dropped
And
Python dropping UDP packet that WireShark sees
(Windows 10, Python 3.6) - in my case I am talking to a device (Embedded system running LWiP)
I send it a series of commands (about N=100), each command has a UDP response, commands tend to be short, mostly lessthen 20 bytes, responses are the same size, but some are huge (1200 bytes)
Occasionally Python does not receive a response UDP packet - yea, I know UDP is not reliable {flame: ON, please dont go ther with me, flame: OFF}
- I'm on a private network in a lab at work, there is minimal traffic.
- On the windows box (via wireshark) I see the response
- BUT - python does not see the response.
- The damn system worked this morning, and does not this afternoon.
- This has happened before, and it goes away - and then it decides 'F-you' it is thursday, It does not work today, just because ...
- I cannot change 5 man years of development at this point, lots of stuff would change, embedded code, fielded devices, test automation, validation scripts - tons and tons of Python - that would be a historic level of effort that nobody will accept.
I need the reason for this drop to be far more reliable or understandable, and not drop packets for no damn reason. I have no simple means to debug why my pythons script does this (and I assume it is python, I can't prove this.
on Linux - I could do that - on Linux I would use STRACE() and trace the system calls, and see the return values in the output log - but this is windows, there is no strace()
More about the issue:
I talk to a LWip STACK, In a loop I send it a query, give me data items X to Y, the device responds, then I ask for the next range - depending on what is being queried, there are 2 to 3 loops before it responds with an empty list.
Then it suddenly says: "Nope not going to deliver that packet"
I need to understand why :-(
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