Ubuntu Serial Port Sniffer Linux Ubuntu

I'm debugging communications with a serial device, and I need to see all the data flowing both directions. It seems like this should be easy on Linux, where the serial port is represented by a file.

Is there some way that I can do a sort of 'bi-directional tee', where I tell my program to connect to a pipe that copies the data to a file and also shuffles it to/from the actual serial port device? I think I might even know how to write such a beast, but it seems non-trivial, especially to get all of the ioctls passed through for port configuration, etc. Has anyone already built such a thing?

Windows My favorite: Advanced Serial Port Monitor v4.1.5 2011-03-28. Works with Windows 7, somewhat limited in the free edition but good for me. Http Also see RS232 Packet Sniffer Question on superuser.com.

It seems too useful (for people debugging serial device drivers) not to exist already. Is very useful for this. You have a visualisation of all ioctl calls, with the corresponding structure decoded. The following options seems particularly useful in your case: -e read=set Perform a full hexadecimal and ASCII dump of all the data read from file descriptors listed in the specified set. For example, to see all input activity on file descriptors 3 and 5 use -e read=3,5.

Note that this is independent from the normal tracing of the read(2) system call which is controlled by the option -e trace=read. -e write=set Perform a full hexadecimal and ASCII dump of all the data written to file descriptors listed in the specified set. For example, to see all output activity on file descriptors 3 and 5 use -e write=3,5.

Note that this is independent from the normal tracing of the write(2) system call which is controlled by the option -e trace=write. I looked at a lot of serial sniffers. All of them are based on the idea of making a virtual serial port and sniff data from that port.

However, any baud/parity/flow changes will break connection. So, I wrote my own sniffer:). Most of the serial ports now are just USB-to-serial converters.

My sniffer collects data from USB through debugfs, parse it and output to the console. Cad tool palettes. Also any baudrate changes, flow control, line events, and serial errors are also recorded.

The project is in the early stage of development and for now, only FTDI is supported. Type in devanagari.

There are a few options: • is a simple program to tunnel/sniff between 2 serial ports. • (slsnif) is a serial port logging utility. It listens to the specified serial port and logs all data going through this port in both directions. • provides a way for a user to connect from a network connection to a serial port. • acts as a serial pass-through device.

It listens for incoming data on two serial ports and forwards it so the devices act as if they are directly connected. It also logs the data as it moves through the ports. • is an RFC 2217-compliant serial port redirector. It lets you share a serial port through a network. It is based on sredird. The RFC2217 protocol is an extension to telnet and allows changing communication port parameters. • is a KDE application for inspecting data going over serial lines.