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Re: [sumo-user] Context Subscription of a Vehicle to Values of Persons (TraCI API C++)
Possibly you are trying to retrieve context subscription results when there aren't any.  The client throws Exceptions without any error message in this case (helpful messages added in the development version). This was the only way I could reproduce an error.
Please see if you get a better error with the development version. Otherwise I need at least the stack traces from your crash (client and server).

regards,
Jakob

2018-01-03 17:30 GMT+01:00 Kaths, Jakob <jakob.kaths@xxxxxx>:

Hey,

 

thanks a lot for your answer. I checked the Python example and adapted it to my needs and it worked. I then prepared the minimal example for C++ and while doing that, I think I found the solution. However, I still didn’t fully understand why… Maybe you could give me a little hint, just for understanding. My subscription to both vehicles and persons around a vehicle works fine now. If I only subscribe to persons though, the program crashes straight after starting it. So, if I comment line 66 it crashes (which is what I did in my not-minimal-example and why I asked for help), if I comment line 67 it works and if I don’t comment either of those two lines, it works, too.

 

You can find the cpp-file here:

https://syncandshare.lrz.de/dl/fiWxH8FERhgLwXaDorAyFmW1/SumoConnect.cpp

 

Thanks for the amazing help here!

 

Jakob Kaths

 

 

Von: sumo-user-bounces@xxxxxxxxxxx [mailto:sumo-user-bounces@eclipse.org] Im Auftrag von Jakob Erdmann
Gesendet: Mittwoch, 20. Dezember 2017 09:32
An: Sumo project User discussions <sumo-user@xxxxxxxxxxx>
Betreff: Re: [sumo-user] Context Subscription of a Vehicle to Values of Persons (TraCI API C++)

 

Hello,

subscribing to persons around an object and subscribing to things around a person should be working. (at least it does in our tests since version 0.31.0).

Can send a small scenario where it fails for you?

regards,

Jakob

 

2017-12-19 17:59 GMT+01:00 Kaths, Jakob <jakob.kaths@xxxxxx>:

Hello!

 

I was wondering if it’s possible to retrieve values of pedestrians in SUMO by subscription. I know, that in Context Subscription in the Wiki (http://sumo.dlr.de/wiki/TraCI/Object_Context_Subscription) pedestrians are not mentioned. However, I found the corresponding value (CMD_GET_PERSON_VARIABLE 0xae) in the TraCIConstants.h and tried to subscribe, but it failed. Is there a possibility to retrieve position, angle, speed etc. from pedestrians via subscription without modelling them as vehicles? If not, is this planned for the future or could you give a hint of how to implement this?

 

Thanks in advance!


Jakob

 

 

--

Dipl.-Ing. Jakob Kaths

 

Technische Universität München
Ingenieurfakultät Bau Geo Umwelt
Lehrstuhl für Verkehrstechnik
jakob.kaths@xxxxxx

 


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