[sumo-user] TRaCI connection refused error

[zhang]

Dear SUMO users ,

I have been trying to implement Traci client in C for my bachelor degree
project .

I am using sumo 0.12.3, I just wanted to see the working of Traci client
so i used testclient which needs a ".def" file which is not provided in
the package. (where do i find it ?)

I implemented a basic structure in C with storage implemented using
struct and linking. I start the SUMO with

sumo -n netfile.xml -r routefile.xml -b 4000 --remote-port 8888

this terminal doesnt pop up any message (but keeps listening)

when i start my client which can send CMD_SIMSTEP and receive response,i get
"connection refused" if i keep on connecting then i get

sumo -n netfile.xml -r routefile.xml --remote-port 8888
Step #0.00Error: tcpip::Socket::receive() @ recv: Success
Quitting (on error).

I am finding no way out .. any suggestion will be helpfull

BR
zhang

[Björn Hendriks]

Hi Zhang,

Post by zhang
I implemented a basic structure in C with storage implemented using
struct and linking. I start the SUMO with
sumo -n netfile.xml -r routefile.xml -b 4000 --remote-port 8888
this terminal doesnt pop up any message (but keeps listening)
when i start my client which can send CMD_SIMSTEP and receive response,i
get "connection refused" if i keep on connecting then i get

What exactly do you send to SUMO? Have you tried to compare the output of a
network sniffer (for example Wireshark) with the data sent by your program?

Post by zhang
sumo -n netfile.xml -r routefile.xml --remote-port 8888
Quitting (on error).

"Success" is probably an error message from your operating system after a call
to the OS function recv() returned a negative value to indicate an error:

#ifdef WIN32
int e = WSAGetLastError();
std::string msg = GetWinsockErrorString( e );
#else
std::string msg = strerror( errno );
#endif

Of course, it's strange to receive "success" as error message; maybe something
else influences errno or WSAGetLastError(). Are you sure no other application
uses port 8888? Maybe the docs of your OS can put some light on this.

Regards
Björn

[zhang wi]

Dear Bjorn,

I didn't use wineshark.. will give it a go.


Well regarding my work platform

--> I use ubuntu VM on top of Mac .

--> the structure of the message is exactly the same as

as the c++ implementation supplied with source package instead of

vectors i have used list . Rest all remains the same (compatible

with c).

1st i tried to connect, when i do that the server should say that

it has accepted connection (as in the server code sumo/src/traciclient)

but i don't get that message, server is quite, then i thought i have

send some command . So i sent CMD_SIMSTEP, but still it doesn't respond


Is there any working client ? where can i find it .. I just want to understand

how it works . The traci test client(in the package) needs a def file
which doesn't exist

where can i find it ?



Hi Zhang,

Post by zhang
I implemented a basic structure in C with storage implemented using
struct and linking. I start the SUMO with
sumo -n netfile.xml -r routefile.xml -b 4000 --remote-port 8888
this terminal doesnt pop up any message (but keeps listening)
when i start my client which can send CMD_SIMSTEP and receive response,i
get "connection refused" if i keep on connecting then i get

What exactly do you send to SUMO? Have you tried to compare the output of a
network sniffer (for example Wireshark) with the data sent by your program?

Post by zhang
sumo -n netfile.xml -r routefile.xml --remote-port 8888
Quitting (on error).

"Success" is probably an error message from your operating system after a call
to the OS function recv() returned a negative value to indicate an error:

#ifdef WIN32
int e = WSAGetLastError();
std::string msg = GetWinsockErrorString( e );
#else
std::string msg = strerror( errno );
#endif

Of course, it's strange to receive "success" as error message; maybe something
else influences errno or WSAGetLastError(). Are you sure no other application
uses port 8888? Maybe the docs of your OS can put some light on this.

Regards
Björn

[Daniel Krajzewicz]

Dear Zhang,

you may consider the Python examples at:
-
http://sumo.sourceforge.net/doc/current/docs/Tutorials/TraCI4Traffic_Lights.html
- http://sumo.sourceforge.net/doc/current/docs/Tutorials/CityMobil.html

For the .cpp-client, you should take a look at the tests. In
<SUMO>/tests/traci/* you will find several tests which also include the
def-file you mentioned. The definition file is always named
"testclient.prog".

sincerely,
Daniel

Post by zhang wi
Dear Bjorn,
I didn't use wineshark.. will give it a go.
Well regarding my work platform
--> I use ubuntu VM on top of Mac .
--> the structure of the message is exactly the same as
as the c++ implementation supplied with source package instead of
vectors i have used list . Rest all remains the same (compatible
with c).
1st i tried to connect, when i do that the server should say that
it has accepted connection (as in the server code sumo/src/traciclient)
but i don't get that message, server is quite, then i thought i have
send some command . So i sent CMD_SIMSTEP, but still it doesn't respond
Is there any working client ? where can i find it .. I just want to understand
how it works . The traci test client(in the package) needs a def file
which doesn't exist
where can i find it ?
Hi Zhang,

Post by zhang
I implemented a basic structure in C with storage implemented using
struct and linking. I start the SUMO with
sumo -n netfile.xml -r routefile.xml -b 4000 --remote-port 8888
this terminal doesnt pop up any message (but keeps listening)
when i start my client which can send CMD_SIMSTEP and receive response,i
get "connection refused" if i keep on connecting then i get

What exactly do you send to SUMO? Have you tried to compare the output of a
network sniffer (for example Wireshark) with the data sent by your program?

Post by zhang
sumo -n netfile.xml -r routefile.xml --remote-port 8888
Quitting (on error).

"Success" is probably an error message from your operating system after a call
#ifdef WIN32
int e = WSAGetLastError();
std::string msg = GetWinsockErrorString( e );
#else
std::string msg = strerror( errno );
#endif
Of course, it's strange to receive "success" as error message; maybe something
else influences errno or WSAGetLastError(). Are you sure no other application
uses port 8888? Maybe the docs of your OS can put some light on this.
Regards
Björn
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[Björn Hendriks]

Hi Zhang,

Post by zhang wi
Well regarding my work platform
--> I use ubuntu VM on top of Mac .

I use a native Ubuntu, so that should work in general.

Post by zhang wi
--> the structure of the message is exactly the same as
as the c++ implementation supplied with source package instead of
vectors i have used list . Rest all remains the same (compatible
with c).

Do you mean you've taken the existing code and replaced std::vector by
std::list? That won't work. The C++ ISO-standard requires std::vector to
behave like a C array (including pointer arithmetic) as long as you don't
change its capacity (IIRC resizing within capacity won't hurt). But, std::list
has very different requirements which are usually fulfilled by a doubly linked
list. Hence, pointer arithmetic on a std::list is undefined behavior.

Post by zhang wi
1st i tried to connect, when i do that the server should say that
it has accepted connection (as in the server code sumo/src/traciclient)
but i don't get that message, server is quite, then i thought i have

I think the server follows the old unix paradigm that no message means no
error. At least, I got no announcement of an established connection.

Post by zhang wi
send some command . So i sent CMD_SIMSTEP, but still it doesn't respond

If not configured to be quiet SUMO usually prints the reached time step to
stdout. I just tried to send a manually assembled CMD_SIMSTEP with netcat and
that worked.

Post by zhang wi
Is there any working client ? where can i find it .. I just want to understand

A C++ client is included in Shawn (shawn.sourceforge.net).

Regards
Björn