The tty0tty directory tree is divided in:
module - linux kernel module null-modem
pts - null-modem using ptys (without handshake lines)
When run connect two pseudo-ttys and show the connection names:
(/dev/pts/1) <=> (/dev/pts/2)
the connection is:
TX -> RX
RX <- TX
The module is tested in kernel 3.10.2 (debian)
When loaded, create 8 ttys interconnected:
/dev/tnt0 <=> /dev/tnt1
/dev/tnt2 <=> /dev/tnt3
/dev/tnt4 <=> /dev/tnt5
/dev/tnt6 <=> /dev/tnt7
the connection is:
TX -> RX
RX <- TX
RTS -> CTS
CTS <- RTS
DSR <- DTR
CD <- DTR
DTR -> DSR
DTR -> CD
For building the module kernel-headers or kernel source are necessary.
Download the tty0tty package from one of these sources: Clone the repo https://github.com/freemed/tty0tty
git clone https://github.com/freemed/tty0tty
Extract it
tar xf tty0tty-1.2.tgz
Build the kernel module from provided source
cd tty0tty-1.2/module
make
Copy the new kernel module into the kernel modules directory
sudo cp tty0tty.ko /lib/modules/$(uname -r)/kernel/drivers/misc/
Load the module
sudo depmod
sudo modprobe tty0tty
You should see new serial ports in /dev/ (ls /dev/tnt*)
Give appropriate permissions to the new serial ports
sudo chmod 666 /dev/tnt*
You can now access the serial ports as /dev/tnt0 (1,2,3,4 etc) Note that the consecutive ports are interconnected. For example, /dev/tnt0 and /dev/tnt1 are connected as if using a direct cable.
Persisting across boot:
edit the file /etc/modules (Debian) or /etc/modules.conf
nano /etc/modules
and add the following line:
tty0tty
Note that this method will not make the module persist over kernel updates so if you ever update your kernel, make sure you build tty0tty again repeat the process.
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