Automatically respawning socat.

When user disconnects from socat the process terminates, so you have to restart it.

To automate this process, you can use /etc/inittab.

Here
2345 -- is enumeration of runlevels for which process is started,
s1 -- is a unique sequence of 1-4 characters which identifies an entry in inittab.

This socat configuration is used to provide access to serial port (UART / RS-485) over TCP/IP.

How to enumerate serial ports using Setup API (win32)

For me using setupapi is the most strait-forward method to retrieve a list of serial ports on Windows.
I should note, that this code works well on XP and higher.



Example of output:

I'm going to offer this code to guys of node-serialport, because current method doesn't work well on some setups with antivir.


Update: The patch is ready https://github.com/Zensey/node-serialport/commit/b4c8e830d248c4f7e3be0fd0d2cd56a18159f2d9


References:
1. https://social.msdn.microsoft.com/Forums/vstudio/en-US/2555943e-0c69-4357-a85b-d6540bcaaf84/using-setupapi-to-return-all-guiddevclassdisplay?forum=vcgeneral
2. http://stackoverflow.com/a/3439805
3. https://gist.github.com/Zensey/7bd7781a28d6be306be5cdd70539dc65