Re: [sumo-user] TraCI subscriptions to route changes

[Michael Behrisch <oss@xxxxxxxxxxx>]

Hi Lara,
it is currently not implemented and at the moment all of the
subscriptions are time triggered and not event based. The easiest way to
get the information without constantly polling is probably to implement
an analogue to simulation.getLoadedIDList for rerouting and subscribe to
that. But this will give you the ids of all rerouted vehicles in every
time step, which may be too much as well.

Best regards,
Michael

Am 05.07.2018 um 10:46 schrieb Lara CODECA:
> Dear all,
> 
> is there a way to subscribe to the route changes events?
> 
> I saw subscribeContext in
> http://www.sumo.dlr.de/daily/pydoc/traci._simulation.html#SimulationDomain-subscribeContext 
> and
> #  command: subscribe route context
> CMD_SUBSCRIBE_ROUTE_CONTEXT = 0x86
> #  response: subscribe route context
> RESPONSE_SUBSCRIBE_ROUTE_CONTEXT = 0x96
> #  command: get route variable
> CMD_GET_ROUTE_VARIABLE = 0xa6
> #  response: get route variable
> RESPONSE_GET_ROUTE_VARIABLE = 0xb6
> #  command: set route variable
> CMD_SET_ROUTE_VARIABLE = 0xc6
> #  command: subscribe route variable
> CMD_SUBSCRIBE_ROUTE_VARIABLE = 0xd6
> #  response: subscribe route variable
> RESPONSE_SUBSCRIBE_ROUTE_VARIABLE = 0xe6
> 
> among the constants, but given that the context requires a radius around a the ego-vehicle, I'm
> probably going in the wrong direction.
> 
> I saw that I can subscribe to traci.vehicle.subscribe(vehid, varIDs=(tc.VAR_ROUTE_INDEX)) but this
> imply I have to see if the route index is different, so I'm jamming TraCI for no reason.
> I need to know when the route of some vehicles is changed by sumo (device router or other). 
> If there is no way to do it, at the moment, where do I have to look in the code to know how to add
> a subscription of this kind?
> 
> Thanks in advance!
> 
> Regards,
> Lara
>

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