Termnetd (aka termpkg apparently) is a cool little application that lets you stream serial port data over the network. It’s a terminal server daemon that exposes the serial port and tty devices directly to a network port.
The setup is pretty simple. If using Ubuntu, you can just use:
sudo apt-get install termnetd
Otherwise, you can build from source by downloading it from http://www.linuxlots.com/~termpkg/
Once installed, the configuration file, /etc/termnetd.conf, can be edited to configure which serial port maps to which network port. It can be used to set serial port connection settings as well. The format is as follows:
<IP port>:<state>:<device>:<termios options>;
3000:on:/dev/ttyS0:B115200 CLOCAL IGNBRK CRTSCTS CS8 CREAD;
In Ubuntu, /etc/default/termnetd, there is a
NO_START option that can be set to let termnetd start automatically at
You can also refer to termnetd(1)
Start termnetd by running
from the command line. From another terminal use telnet or netcat to receive the data
nc localhost 3000
I work with embedded systems and termnetd has been great for me. I am now able to run this on the target and use python or any other flexible interpreted language on the host side.
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