Re: [sumo-user] Adding multiple clients to the SUMO dynamically.

[satyam bandarapu <sbandarapu1@xxxxxxxxx>]

Hi Michael,

Subscription in TraaS is supported. I written and tested examples based on the TraaS source code. May be need to update the documentation? and also if wanted I can share the example.

If anyone interested, they can try out with following way:

    Implement your class with java.util.Observer  and add the following code in constructor.

            SumoTraciConnection conn = new SumoTraciConnection(sumo_app, config_file);
            conn.addOption("step-length", step_length+"");
            conn.addOption("start",null); //start sumo immediately
            conn.runServer();
            conn.addObserver(this);
            VariableSubscription vs = new VariableSubscription(SubscribtionVariable.simulation,0,100000 * 60, "veh0");
            vs.addCommand(Constants.VAR_ARRIVED_VEHICLES_IDS);
            vs.addCommand(Constants.VAR_DEPARTED_VEHICLES_IDS);
            conn.do_subscription(vs);
            VariableSubscription vs1= new VariableSubscription(SubscribtionVariable.vehicle,0,100000 * 60, "veh0");
            vs1.addCommand(Constants.VAR_POSITION);
            vs1.addCommand(Constants.VAR_SPEED);
            vs1.addCommand(Constants.VAR_DISTANCE);
            conn.do_subscription(vs1);

and listen the events in your class as follows:

public void update(Observable arg0, Object arg1) {
        SubscriptionObject so = (SubscriptionObject) arg1;
        if (so.response.id == Constants.RESPONSE_SUBSCRIBE_VEHICLE_VARIABLE) {
            if (so.variable == Constants.VAR_SPEED) {
                SumoPrimitive sp = (SumoPrimitive) so.object;
                System.out.println("Speed of the vehicle " + sp.val);

            } else if (so.variable == Constants.VAR_POSITION) {
                SumoPosition2D sc = (SumoPosition2D) so.object;
                System.out.println("Position of the vehicle x = " + sc.x + " y = " + sc.y);
            } else if (so.variable == Constants.VAR_DISTANCE) {
                SumoPrimitive sp = (SumoPrimitive) so.object;
                System.out.println("Distance of the vehicle " + sp.val);
            }

        } else if (so.response.id == Constants.RESPONSE_SUBSCRIBE_SIM_VARIABLE) {
            SumoStringList ssl=(SumoStringList) so.object;
            if(ssl.size()>0) {
                if (so.variable == Constants.VAR_DEPARTED_VEHICLES_IDS) {
                    System.out.println("subscription Departed vehicles: "+ssl.size());
                } else if (so.variable == Constants.VAR_ARRIVED_VEHICLES_IDS) {
                    System.out.println("subscription Arrived vehicles: "+ssl.size());
                }
            }
        }
    }

Br,

Satyam

On Thu, Feb 1, 2018 at 11:36 PM, Michael Behrisch <oss@xxxxxxxxxxx> wrote:

Hi Satyam,
there is at least subscription code in the traas sources but I don't know of any exmaples and did not try it myself. The documentation http://traas.sourceforge.net/cms/index.php?id=documentation says it is not supported, but I am forwarding this to the mailing list and the original TraaS author, maybe someone there can help.

Best regards,
Michael

Am 2018-02-02 07:22, schrieb satyam bandarapu:

Hi Michael,

Thank you for the email. Implementing proxy seems to work for me. is it
subscription working in TraaS(Java)? if yes, any examples?

Br,
Satyam

On Wed, Jan 31, 2018 at 11:56 PM, Michael Behrisch <oss@xxxxxxxxxxx> wrote:

Dear Satyam,
the problem is that SUMO is currently not multithreaded and so cannot wait
for connections and execute simultaneously. One could introduce a
waitforconnect command but this seems rather clumsy and we would prefer to
introduce multithreading which is not that hard but still needs some days
to implement correctly. If you are willing to try we can help you here at
least by giving pointers where to start. The much easier solution is of
course to write a simple proxy in the programming language of your choice
which will connect as the only instance to sumo and will itself accept
connections and route them through.

Best regards,
Michael


Am 2018-01-31 23:52, schrieb satyam bandarapu:

Hi,

I am trying to connect multiple clients to the SUMO(SUMO-GUI) 0.32.0. I
got
to know from the following link that "When using multi client setups the
number of clients needs to be known when starting SUMO and all clients
need
to connect before the first simulation step".

http://sumo.dlr.de/wiki/TraCI/Protocol

My requirement is to add the clients dynamically after starting the SUMO.
Can anyone explain, is it architecturally possible to extend the SUMO
source code to support above feature? if yes, how big is the changes and
where is the modifications required in the source files?

I am looking to write clients in TracAPI(C++) or TraaS(Java).

Appreciate your help.

Thanks
Satyam

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