Add virtual port

[alexisgaziello]

The python script actually only calls an app called socat. I could not find another way to do this.
I also added some options I have in my script.
Feel free to modify, add or eliminate anything.

If you decide to add this code, it would be interesting to test it in other OS. I could only try it in Ubuntu 16.04.
Also in requirements or README a line like this one should be added:
$ sudo apt-get update && sudo apt-get install socat

[wlkh]

Thanks Alexis,

Not sure I fully understand why two serial ports are needed, care to explain?
Do you open this in Qgis by connecting to /dev/ttyS9?

[alexisgaziello]

Hello Kristian,
You need two virtual ports because you create some sort of link between them. Everything you write on one port appears in the other and viceversa. In this case we read information from ttyS9 that has been written through ttyS8.