Thank you for the advice Mirko, One more question. Can I use *tc.LCA_CHANGE_TO_HELP* with any domain? Or is that also used internally as a constant? Would love to use it as an additional metric, seeing how many times a vehicle changes its lane to help another vehicle (if that's what it's for).
Sincerely, Hriday On Thu, 21 Dec 2023 at 08:16, Mirko Barthauer <[email protected]> wrote: > Dear Hriday, > > > > you can find a list of which values can be retrieved in each domain in the > docs <https://sumo.dlr.de/docs/TraCI.html#value_retrieval>. > tc.VAR_ALLOWED_SPEED is for vehicles (max speed on lane is > tc.VAR_MAXSPEED). There is no getter for tc.VAR_PREV_SPEED as this a value > provided by the user anyway. The remaining ones you listed do not belong to > the variables to retrieve but are simple constants used in some TraCI > functions. > > > > Best regards > > Mirko > > > > > > > > -----Original-Nachricht----- > > Betreff: [sumo-user] Need Assistance with TraCI Constants and Subscription > Domains in SUMO > > Datum: 2023-12-20T17:41:22+0100 > > Von: "Hriday Sanghvi via sumo-user" <[email protected]> > > An: "Sumo project User discussions" <[email protected]> > > > > > > > Hello, my version info: > > TraCI VERSION 21 > 'SUMO 79d8ebc13' (updated today) > Ubuntu 18.04.6 LTS > > On seeing* traci.exceptions.TraCIException*: *Could not add subscription. > Get Vehicle Variable: unsupported variable 0x23 specified *for some traci > constants I was trying to use for subscriptions, I realized that maybe the > domain I was using was wrong. So I figured the domain out for some of them > like *tc.VAR_COLLISIONS is used in traci.simulation.subscribe(), > tc.VAR_ACCEL in traci.vehicletype.subscribe() tc.VAR_SPEED in > traci.vehicle.subscribe()* - all by trial and error/guesswork. I still > can't figure out the correct domains for the following constants: > > tc.VAR_ALLOWED_SPEED (assumed it was lane domain, but nope) > tc.VAR_PREV_SPEED (should have been vehicle domain, but nope) > > However, for some constants: > > tc.LCA_WANTS_LANECHANGE, > tc.LCA_WANTS_LANECHANGE_OR_STAY, > tc.LANE_CHANGES, > tc.LANE_ALLOWED, > tc.LANECHANGE_LEFT, > tc.LANECHANGE_RIGHT, > > the error is very different: > > > > > > > > > > > > *Traceback (most recent call last):File "code_tester.py", line 38, in > <module>tc.LCA_WANTS_LANECHANGE, # (or whatever the constant is in the > list)File "/home/alice/sumo/tools/traci/domain.py", line 188, in > subscribeself._connection._subscribe(self._subscribeID, begin, end, > objectID, varIDs, parameters)File > "/home/alice/sumo/tools/traci/connection.py", line 295, in _subscriberesult > = self._sendCmd(cmdID, (begin, end), objID, format, *args)File > "/home/alice/sumo/tools/traci/connection.py", line 212, in _sendCmdpacked = > self._pack(format, *values)File > "/home/alice/sumo/tools/traci/connection.py", line 170, in _packpacked += > struct.pack("!B", int(v))struct.error: ubyte format requires 0 <= number <= > 255* > > How can I fix this from my end? I have attached the minimum code to > reproduce this as a zip. P.S. The reason I have to use TraCI for this case > is because that's the only way I have been able to use the GUI for years. > > Thank you. > > Sincerely, > Hriday > > > >
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