MDD models stopped working

[Bernhard Thiele]

There was a regression that has affected the Modelica_DeviceDrivers library.

For example, UDP communication is not working any more. I could trace the regression to the commit ​https://github.com/OpenModelica/OpenModelica/commit/66c68ab39d1185595d69feddaeb199c6277f49a1

Starting with the referenced commit simulation will fail (no result file is produced). It seems something goes wrong in the initialization of the external objects. Before the referenced commit a result file is produced and the external objects initialization works.

Following script can be used for testing (please check out the MDD library master branch for testing):

loadModel(Modelica);
print("*** Loading MDD...' ");
loadFile("/libraries/Modelica_DeviceDrivers/package.mo"); getErrorString();

loadString("
model RunMe
extends Modelica_DeviceDrivers.Blocks.Examples.TestSerialPackager_UDP;
end RunMe;
"); getErrorString();
simulate(RunMe); getErrorString();

I hope we can fix this regression before the beta release, since the MDD paper at the upcoming Modelica conference states that this model works now with OM.

[Patrick Täuber]

I will try to fix this on Monday.

[Patrick Täuber]

Fixed in ​9f91701. Please check if everything works fine now.

[Bernhard Thiele]

I just checked the UDP example and it works :-). I will do checks for the serial port etc. later this afternoon, but at first sight it looks like the issue is fixed. Thanks a lot for the quick fix!