Hi!
Much appreciate your work on the C# implementation of the interface.

I've recently tried to extend the TraCI.NET lib on subscription but kinda got stuck now.
My goal is to use TraCI# directly within Unity3D to retrieve data from SUMO and manipulate vehicle-movement in Unity.

I forked the repo and created a branch "clean-up". TraCI.NET's readme shows which scripts are modified or extended. Please excuse my amateurish approach - hope there is something to take from.
The readme also shows how I retrieve the data.

With this approach and sumo run with --verbose I get an error after invoking the subscription:
Step #0.20Error: Answered with error to command 0xd4: Wrong position in requestMessage after dispatching command. Expected command length was 21 but 16 Bytes were read.

Response-array's variable is D4 (but should be E4) and response-byte-array is:
FF-00-00-00-72-57-72-6F-6E-67-20-70-6F-73-69-74-69-6F-6E-20-69-6E-20-72-65-71-75-65-73-74-4D-65-73-73-61-67-65-20-61-66-74-65-72-20-64-69-73-70-61-74-63-68-69-6E-67-20-63-6F-6D-6D-61-6E-64-2E-20-45-78-70-65-63-74-65-64-20-63-6F-6D-6D-61-6E-64-20-6C-65-6E-67-74-68-20-77-61-73-20-32-31-20-62-75-74-20-31-36-20-42-79-74-65-73-20-77-65-72-65-20-72-65-61-64-2E

With given information and pseudo-script in the above mentioned branch, it should be possible to reproduce the error. Maybe someone has an idea.

Hello,
I am currently adding functionality for context subscription and I am having problem making HandleResponse handle both Context and Variable Subscription. In particular I don't understand this piece of code

                trresult.Identifier = response[i + j++];

                if (trresult.Identifier == TraCIConstants.CMD_SIMSTEP && totlength == response.Count() && len + 8 != response.Count())
                {
                    var revSubCount = response.Skip(i + len).Take(4).Reverse().ToArray();
                    var subCount = BitConverter.ToInt32(revSubCount, 0);
                    len += 5;
                    for (int n = 0; n < subCount; n++)
                    {
                        var revSubResponseLength = response.Skip(i + len).Take(4).Reverse().ToArray();
                        var SubResponseLength = BitConverter.ToInt32(revSubResponseLength, 0);
                        len += SubResponseLength;

                    }

                    trresult.Length = --len;
                }

What is len in this context and why do you decrement by one at the end?

I have implemented Context Subscription and it works when changing the above code but I can't support both Context and Variable Subscription.

Any input on how HandleResponse code works would be very helpful.

Thank you,
Tom

P.S I didn't know how I could contact you otherwise.

• I have made the context subscription following the pattern for the variable subscription (using events). Is there any important guidelines I must follow so I can push my code?

Hi, are you planning to support the .net core?
Thank you in advance.

Most important:
Following methods are now using double for time instead of int.
traci.simulationStep
traci.vehicle.slowDown
traci.vehicle.changeLane
traci.vehicle.setStop
traci.simulation.getDeltaT
traci.trafficlight.getNextSwitch
traci.trafficlight.getPhaseDuration
traci.trafficlight.setPhaseDuration

Also see: http://sumo.dlr.de/wiki/ChangeLog

Gui command "screenshot" does not create screenshot as aspected.
But command returns "success"...

When i trying to remove any vehicle from the simulation by calling
Vehicle.Remove(vehID, TraCIConstants.REMOVE_VAPORIZED);
Sumo throws an error with message:
Error: Answered with error to command 0xc4: Wrong position in requestMessage after dispatching command 196. Expected command length was 11 but 10 Bytes were read.

Is this a known error or maybe I am doing something wrong?

getting " InvalidOperationException: Sequence contains no elements " error when trying to call

var linkcount = client.TrafficLight.GetControlledLinks(newjunction.name).Content.NumberOfSignals;

Not my code. It seems to me that possibly the .NumberofSignals is not a defined value.
The original code is trying to return the controlledlinks.length integer value from SUMO, I believe.

Hi,
While using TraCI.NET, I found something wrong with the MoveToXY() function.
I checked the code. Variables ( itemNumber & yPosition ) are not used in this function.
It seems that the function is not completed.

        public TraCIResponse<object> MoveToXY(string id, int itemNumber, string edgeId, int laneIndex, double xPosition, double yPosition, double angle, int keepRoute = -1)
        {
            var tmp = new CompoundObject();
            tmp.Value.Add(new TraCIString() { Value = edgeId });
            tmp.Value.Add(new TraCIInteger() { Value = laneIndex });
            tmp.Value.Add(new TraCIDouble() { Value = xPosition });
            tmp.Value.Add(new TraCIDouble() { Value = angle });
            if (keepRoute == 0 || keepRoute == 1 || keepRoute == 2)
            {
                tmp.Value.Add(new TraCIByte() { Value = (byte)keepRoute });
            }

            return TraCICommandHelper.ExecuteSetCommand<object, CompoundObject>(
                     Client,
                     id,
                     TraCIConstants.CMD_SET_VEHICLE_VARIABLE,
                     TraCIConstants.MOVE_TO_XY,
                     tmp
                     );
        }

Hello,
From vehicle value retrieval in sumo docs there is no Get Vehicle Command with code 0x57. In your VehicleCommands Class you have
/// <summary> /// Returns the ids of the edges the vehicle's route is made of /// </summary> /// <param name="id"></param> /// <returns></returns> public TraCIResponse<List<string>> GetRoute(string id) { return TraCICommandHelper.ExecuteGetCommand<List<string>>( Client, id, TraCIConstants.CMD_GET_VEHICLE_VARIABLE, TraCIConstants.VAR_ROUTE); }
Where you attempt to to use VAR_ROUTE which is 0x57 as a CMD_GET_VEHICLE_VARIABLE command. The 0x57 is only a set command. You might want to replace VAR_ROUTE with VAR_EDGES which is 0x54. In the sumo docs the python library uses getRoute() using 0x54. I want to add that you have getRoute() implemented as GetEdges() which correctly uses 0x54 but I'd suggest you remove it or deprecate it and use GetRoute() with VAR_EDGES just to be consistent with python conventions.

Thank you.

Edit: You don't actually have GetEdges() in VehicleCommands so you should just Implement GetRoute() command. I mistook it with RouteCommands.GetEdges(). Sorry for the inconvenience.

Something weird happened in this commit ae67cfc

the folder CodingConnected.Traci.NET/CodingConnected.TraCI.NET is now twice there.
one time with CI in TraCI
and one time with ci in Traci

the ci folder does not appear on my pc after fetch & pull.

i want to submit a new pull request and it's telling me that changed each file twice.

Hi, I am using OMNeT++-5.5.1, Veins-5.0, and SUMO-1.2.0. I am trying to stop a vehicle at a parking area through setParkingAreaStop command, but the simulation terminated with the following error:

Error: Answered with error to command 0x00: Wrong position in requestMessage after dispatching command 0. Expected command length was 70 but 2 Bytes were read.

The following is the code of my setParkingAreaStop command:

void TraCICommandInterface::Vehicle::setParkingAreaStop(std::string edgeId, double endPos, uint8_t laneInd,double duration,uint8_t flag){
    uint8_t variableId = CMD_STOP;
    uint8_t variableType = TYPE_COMPOUND;
    uint8_t Edgetype= TYPE_STRING;
    uint8_t Postype= TYPE_DOUBLE;
    uint8_t Lanetype= TYPE_BYTE;
    uint8_t Durtype= TYPE_INTEGER;
    int32_t count = 5;
    TraCIBuffer buf = connection->query(CMD_SET_VEHICLE_VARIABLE, TraCIBuffer() << variableId << nodeId << variableType << count << Edgetype << edgeId << Postype << endPos << Lanetype << laneInd  << Postype << duration << Lanetype << flag);
        ASSERT(buf.eof());
}

How can I solve this problem? please help. Thanks.

Hi,
While trying Vehicle.GetPosition() Method, It return "System.ArgumentOutOfRangeException".
I Debug the "TraCIDataConverter Class" and found this method returning "type" 0x01 as Response.
I think it should actual return First 0x0F because this method is of compound type and then 0x01 as for Position2D.

This issue is present for Sumo v.1.13.0 - v.1.16.0

Reproduce Steps

1. perform any context subscription e.g client.Vehicle.SubscribeContext()
2. call client.Control.SimStep()
3. application crash due to null/invalid response from sumo

Possible Cause: eclipse-sumo/sumo#10108

Hi there, really thanks for making this library. I am just starting to learn this and want to retrieve the vehicle position in the example. I have added the VAR_POSITION to subscribed variables, and create output as Console.WriteLine("VAR_POSITION " + (r as TraCIResponse).Content); But when I run it, the output is VAR_POSITIONCodingConnected.TraCI.NET.Types.Position2D. Can you help to point out what is wrong and where shall I edit, please? Thanks so much.

Hello, I'm using your project for visualizing and real time controlling SUMO simulation.
ASP server for controlling simulation(change trafficlights, summone some vehicles and so on) with Unity3D client.
Behind the scene, I'm starting sumo with project with given ip and port.
C:\Program Files (x86)\Eclipse\Sumo\bin\sumo
-c net_bel.sumocfg
--step-length 0.2
--additional-files // some xml files here.
--remote-port 4321

Every 0.2 seconds (same as step length) calling MakeStep.

List<string> _vehicleIds = new List<string>();
float _stepLength = 0.2f;
void Start()
    {
        _client = new TraCIClient();

        _client.TrafficLightSubscription += Client_TrafficLightSubscription;
        _client.VehicleContextSubscription += Client_VehicleContextSubscription;
        var res = _client.Connect("localhost", 4321);

        // That's just for tests. The forsing sumo to make a step is called outside at ASP server.
        InvokeRepeating("MakeSumoStep", 1f, _stepLength);
    }
    void MakeSumoStep()
    {
        _client.Control.SimStep();

        _simulationStep += _stepLengthDecimal;

        var activeIds = _client.Vehicle.GetIdList().Content;
        var newIds = activeIds.Where(id => !_vehicleIds.Contains(id)).ToList();
        var removeIds = _vehicleIds.Where(id => !activeIds.Contains(id)).ToList();

        _vehicleIds.AddRange(newIds);

        foreach (var id in newIds)
            _client.Vehicle.SubscribeContext(id, 0, 1000, TraCIConstants.CMD_GET_VEHICLE_VARIABLE, 1000f, vehicleVariablesToSubscribeTo);

        foreach (var id in removeIds)
            _client.Vehicle.UnsubscribeContext(id, TraCIConstants.CMD_GET_VEHICLE_VARIABLE);
    }

    void Client_VehicleContextSubscription(object sender, ContextSubscriptionEventArgs e)
    {
        var simStep = _simulationStep;

        foreach (var item in e.VariableSubscriptionByObjectId)
        {
            var id = item.Value.ObjectId;
            var angle = item.Value.ResponseByVariableCode[TraCIConstants.VAR_ANGLE].GetContentAs<decimal>();
            var position = item.Value.ResponseByVariableCode[TraCIConstants.VAR_POSITION].GetContentAs<Position2D>();
            var lights = item.Value.ResponseByVariableCode[TraCIConstants.VAR_SIGNALS].GetContentAs<int>();
            var type = item.Value.ResponseByVariableCode[TraCIConstants.VAR_TYPE].GetContentAs<string>();

            // Next there're code for visualizing this vehicle at Unity world, but for the text I'll write Debug.Log
            Debug.Log($"{e.ObjectId} {position.X} {position.Y} {_simulationStep}");
        }
    }

As you can see, I subscribe to VehicleContextSubscription to handle vehicle's move behvaiour, and caching the _vehicleIds of current active vehicles.
On each forsing SUMO simulation step I subscribe (doing _client.Vehicle.SubscribeContext) to new vehilce IDs and unsubscribe to (doing _client.Vehicle.UnsubscribeContext) to removed vehicle IDs.
But, there's a problem that many vehicle datas are duclicated, so my debug logging is writeing many duplicates.
For example, "car1_1 0.1 0.1 0.2" was written like 4 times. And this is repeated constantly.

I was trying to use .net version of TracI to control a sumo simulation from multiple clients. To do that I needed to set the order from each client using SetOrder(). I'm calling the SetOrder(int m) method just after creating the connection but It's showing me an error
"Error: Answered with error to command 0x00: Wrong position in requestMessage after dispatching command 0. Expected command length was 6 but 2 Bytes were read. ". I'm still pretty new to Sumo and yet to figure out what went wrong actually.

When calling client.Lane.GetLinks(someLaneID), I get the following error:

InvalidOperationException: Sequence contains no elements
System.Linq.Enumerable.First[TSource] (System.Collections.Generic.IEnumerable`1[T] source) (at <351e49e2a5bf4fd6beabb458ce2255f3>:0)
CodingConnected.TraCI.NET.Helpers.TraCIDataConverter.GetValueFromTypeAndArray (System.Byte type, System.Collections.Generic.IEnumerable`1[T] array, System.Object& Object) (at Assets/Scripts/Simulation/CodingConnected.TraCI.NET/Helpers/TraCIDataConverter.cs:781)
CodingConnected.TraCI.NET.Helpers.TraCIDataConverter.ExtractDataFromResponse[T] (CodingConnected.TraCI.NET.TraCIResult[] response, System.Byte commandType, System.Byte messageType) (at Assets/Scripts/Simulation/CodingConnected.TraCI.NET/Helpers/TraCIDataConverter.cs:47)
CodingConnected.TraCI.NET.Helpers.TraCICommandHelper.ExecuteGetCommand[T] (CodingConnected.TraCI.NET.TraCIClient client, System.String id, System.Byte commandType, System.Byte messageType) (at Assets/Scripts/Simulation/CodingConnected.TraCI.NET/Helpers/TraCICommandHelper.cs:121)
CodingConnected.TraCI.NET.Commands.LaneCommands.GetLinks (System.String id) (at Assets/Scripts/Simulation/CodingConnected.TraCI.NET/Commands/LaneCommands.cs:83)
SumoClientClass.MainLoop () (at Assets/Scripts/SumoClient/SumoClientClass.cs:93)