Re: [sumo-user] Subscribing to simulation variables

[Matthew Jones <Matthew.Jones@xxxxxxxxx>]

Ah, ok. Thank you!
Does that bug mean we need to use a very large radius to describe a circle that encloses the box, that in turn encloses the simulation?

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From: sumo-user <sumo-user-bounces@xxxxxxxxxxx> on behalf of Jakob Erdmann <namdre.sumo@xxxxxxxxx>
Sent: 16 December 2022 07:55
To: Sumo project User discussions <sumo-user@xxxxxxxxxxx>
Subject: Re: [sumo-user] Subscribing to simulation variables

 

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The first parameter is ignored when subscribing to simulation context.

Please also be aware of https://github.com/eclipse/sumo/issues/12306

Am Di., 13. Dez. 2022 um 13:09 Uhr schrieb Matthew Jones <Matthew.Jones@xxxxxxxxx>:

Hello,

I am trying to debug some simulation problems, from C++ code.
Our main class is 
    class TrafficModel : public TraCIAPI
and in its constructor we have this, which works:
    mStartTime = simulation.getTime();
    mDeltaTime = simulation.getDeltaT();
however, if I call

    simulation.getIDCount();

or

    simulation.getIDList();

they block and the application freezes.

What I am actually trying to do is
    const std::vector<int> varsSimulation{

      libsumo::VAR_TELEPORT_STARTING_VEHICLES_NUMBER,

      libsumo::VAR_TELEPORT_STARTING_VEHICLES_IDS,

      libsumo::VAR_TELEPORT_ENDING_VEHICLES_NUMBER,

      libsumo::VAR_TELEPORT_ENDING_VEHICLES_IDS,

      libsumo::VAR_ARRIVED_VEHICLES_NUMBER,

      libsumo::VAR_ARRIVED_VEHICLES_IDS,

    };

    simulation.subscribeContext("", libsumo::CMD_GET_SIM_VARIABLE, 99999, varsSimulation, 0, 999999999);

but this also blocks, so I was trying to work out what to pass for the first parameter to subscribeContext.

Obviously I'm doing something wrong but I can't work out what it is!

I couldn't find anything in the documentation about what the first parameter for subscribeContext means when we are dealing with the simulation scope.
Are there restrictions on when any of these methods can be called?

Thanks,

Matthew.

Matthew Jones

Senior Software Engineer
rFpro Limited

E: matthew.jones@xxxxxxxxx
W:  www.rFpro.com

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