Save the state using an external object (see the specification on how to do this)

Hi, I have used external functions for serial communication.
Below is code to create serial object

class Serial

extends ExternalObject;

encapsulated function constructor

input Integer PortNum;

output SerialPort Sport;

external "c" Sport=openport(PortNum);

annotation (Library="cfile2");

end constructor;



encapsulated function destructor

input SerialPort Sport;

output Integer i;

external "c" i=closeport(Sport);

annotation (Library="cfile2");

end destructor;



end Serial;

You can  use above object as

model PIcontroller

import Serial;

Serial sp = Serial(3); //opens serial port 3 and keeps it open

equation

.

.

end PIcontroller;

Hope this helps.

Thank you sjoelund.se and swaroop.katta!

I read the chapter in the modelica specification about external classes.  For an example case I'm making a python server that returns the mean of two numbers and a model that calls the server to get the average.  I've got everything roughly implemented.  The communication is handled with a unix socket.  I'm still working out a few bugs and then need to get rid of some of the hardcoded paths (seeing how arguments are passed for the serial example will help with this...). Its going pretty well overall.

Adam

Here's the example in case you'd like to check it out:

https://github.com/adamLange/modelicaSocketExample