Linux下的伪串行通信 [英] Fake serial communication under Linux

问题描述

我有一个应用程序，我想在其中模拟设备和调制解调器"之间的连接.该设备将连接到串行端口，并通过该端口与软件调制解调器通信.

I have an application where I want to simulate the connection between a device and a "modem". The device will be connected to a serial port and will talk to the software modem through that.

出于测试目的，我希望能够使用模拟软件设备来测试发送和接收数据.

For testing purposes I want to be able to use a mock software device to test send and receive data.

Python示例代码

Example Python code

device = Device()
modem  = Modem()
device.connect(modem)

device.write("Hello")
modem_reply = device.read()

现在，在我最终的应用程序中，我将只传递/dev/ttyS1或COM1或任何供应用程序使用的内容. 但是，我该如何在软件中执行此操作?我正在运行 Linux ，并且应用程序是用 Python 编写的.

Now, in my final app I will just pass /dev/ttyS1 or COM1 or whatever for the application to use. But how can I do this in software? I am running Linux and application is written in Python.

我尝试制作一个FIFO(mkfifo ~/my_fifo)，它确实起作用，但是随后我将需要一个FIFO来进行写入，而需要一个FIFO来进行读取.我想要的是打开~/my_fake_serial_port并对其进行读写.

I have tried making a FIFO (mkfifo ~/my_fifo) and that does work, but then I'll need one FIFO for writing and one for reading. What I want is to open ~/my_fake_serial_port and read and write to that.

我也已经用pty模块付款了，但是也不能使它正常工作.我可以从pty.openpty()获取主文件和从文件描述符，但是尝试读取或写入它们只会导致IOError Bad File Descriptor错误消息.

I have also lpayed with the ptymodule, but can't get that to work either. I can get a master and slave file descriptor from pty.openpty() but trying to read or write to them only causes IOError Bad File Descriptor error message.

评论使我想到了这样的问题是否有像COM0COM这样的程序在Linux中?，它使用socat设置虚拟串行连接. 我这样使用它:

Comments pointed me to the SO question Are there some program like COM0COM in linux? which uses socat to setup a virtual serial connection. I used it like this:

socat PTY,link=$HOME/COM1 PTY,link=$HOME/COM2

对于其他人，非常感谢您向我提供了宝贵的信息. 我选择接受 Vinay Sajips 的回答，因为那是我在socat建议出现之前所寻求的解决方案.看来效果很好.

To the rest of you, thank you for giving me valuable information. I chose to accept Vinay Sajips's answer since that is the solution which I went for before the socat suggestion showed up. It seems to work well enough.

推荐答案

最好使用 pyserial 与串行端口通信，您只需创建serial.Serial类的模拟版本即可实现read，readline，write以及您需要的任何其他方法.

It's probably best to use pyserial to communicate with the serial port, and you can just create a mock version of the serial.Serial class which implements read, readline, write and any other methods you need.

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