Re: [sumo-user] Disconnect with Traci

[Menno van der Woude <menno@xxxxxxxxxxxxxxxxxx>]

Hi Zhiqiang,

it seems like SUMO is not running, since the the client cannot connect 
to the TCP server. Make sure you start SUMO with the --remote-port <INT> 
option as described here: http://sumo.dlr.de/wiki/TraCI#SUMO_startup.

If you need to simulate many runs, you will have to automate starting 
SUMO as well.

Greets,

Menno

On 10-7-2018 14:34, 胡志强 wrote:
> Dear sumo-users:
>          I am doing a traffic light program to optimize the timing of 
> traffic light by using Traci.But I met a problem,I need to simulate the 
> process again and again,then,I got this error:
>
> Could not connect to TraCI server at localhost:55141 [Errno 111] 
> Connection refused
>   Retrying in 2 seconds
> Could not connect to TraCI server at localhost:55141 [Errno 111] 
> Connection refused
>   Retrying in 3 seconds
> Could not connect to TraCI server at localhost:55141 [Errno 111] 
> Connection refused
>   Retrying in 4 seconds
> Could not connect to TraCI server at localhost:55141 [Errno 111] 
> Connection refused
>   Retrying in 5 seconds
> Could not connect to TraCI server at localhost:55141 [Errno 111] 
> Connection refused
>   Retrying in 6 seconds
> Could not connect to TraCI server at localhost:55141 [Errno 111] 
> Connection refused
>   Retrying in 7 seconds
> Could not connect to TraCI server at localhost:55141 [Errno 111] 
> Connection refused
>   Retrying in 8 seconds
> Could not connect to TraCI server at localhost:55141 [Errno 111] 
> Connection refused
>   Retrying in 9 seconds
> Could not connect to TraCI server at localhost:55141 [Errno 111] 
> Connection refused
>   Retrying in 10 seconds
> Could not connect to TraCI server at localhost:55141 [Errno 111] 
> Connection refused
> Traceback (most recent call last):
>    File "main.py", line 78, in <module>
>      train(RL_natural)
>    File "main.py", line 26, in train
>      observation = env.reset()
>    File 
> "/home/huzhiqiang/traffic-signal-control/traci_tls_PER_8s_lr0.00025/trafficlight_env.py", 
> line 110, in reset
>      "--tripinfo-output", "tripinfo.xml"])
>    File "/home/huzhiqiang/sumo/tools/traci/__init__.py", line 86, in start
>      _connections[label] = connect(port, numRetries, "localhost", 
> sumoProcess)
>    File "/home/huzhiqiang/sumo/tools/traci/__init__.py", line 64, in connect
>      raise FatalTraCIError("Could not connect in %s tries" % (numRetries 
> + 1))
> traci.exceptions.FatalTraCIError: Could not connect in 11 tries
>
> How can I fix it?
>
> Best regards,
> Zhiqiang
>
>
>
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