Hello Jakob,
I cannot use --save-state.xx options as I do not know beforehand when I will want to save the state. What I need is to be able to do it on request via TraCI.

I implemented this in SUMO 0.25 (rev 19749), see attached patch for the changes. The parts of SUMO I was dealing with were written quite elegantly and so the changes are not all that complicated (for which I am grateful :-)). It now recognizes TraCI command 0x03 as a request to save the simulation state. I invoke it from python simply as

    def saveState(self, filename):
        self._beginMessage(0x03, 0, filename)
        self._sendExact()

Can you make similar functionality part of mainstream SUMO/TraCI? It would simplify things for me.

Thank you,
Matej.
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