CoppeliaSim forums

Posted: **03 Apr 2017, 17:42**

Hi all,

On Linux x64 I am trying to connect several Python processes to V-Rep.
The first successfully connects but the other ones are rejected with 2 errors: No value + Timeout.

Even the simpleTest.py sample fails to connect twice. Example:

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# TERMINAL 1
$ python simpleTest.py
Program started
Connected to remote API server
('Number of objects in the scene: ', 15)
('Mouse position x: ', 1161)
[... and so on...]

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# MEANWHILE, ON TERMINAL 2
$ python simpleTest.py
Program started
Connected to remote API server
('Remote API function call returned with error code: ', 3)
Program ended

I thought it could be due to MAX_EXT_API_CONNECTIONS not set to 255, but recompiling shows that this is the default value:

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V-REP_PRO_EDU_V3_3_2_64_Linux/programming/remoteApiBindings/lib$ make
gcc -I../../include -I../../remoteApi -Wall -DNON_MATLAB_PARSING -DMAX_EXT_API_CONNECTIONS=255 -fPIC -D__linux -c ../../remoteApi/extApi.c -o extApi.o
../../remoteApi/extApi.c: In function ‘_communicationThread’:
../../remoteApi/extApi.c:1813:16: warning: variable ‘crc’ set but not used [-Wunused-but-set-variable]
     simxUShort crc,pureDataOffset0;
                ^
gcc -I../../include -I../../remoteApi -Wall -DNON_MATLAB_PARSING -DMAX_EXT_API_CONNECTIONS=255 -fPIC -D__linux -c ../../remoteApi/extApiPlatform.c -o extApiPlatform.o
gcc extApi.o extApiPlatform.o -o lib/remoteApi.so -lpthread -ldl -I../../include -I../../remoteApi -Wall -DNON_MATLAB_PARSING -DMAX_EXT_API_CONNECTIONS=255 -fPIC -D__linux -lpthread -ldl -shared

What else could it be?

Posted: **04 Apr 2017, 19:00**

Hello,

you need to make sure that your second client connects on a different remote API port. Is this the case?
This would also mean that on the V-REP side, you need to start two remote API server services on two different ports, where the clients will be able to connect to.

Cheers

Posted: **04 Apr 2017, 22:07**

Thanks for this reply coppelia, since a netstat returned only one open port I assumed it was accepting several connections on this single port (which would be more handy by the way). How do you activate several remote API server services?

Posted: **05 Apr 2017, 07:57**

When you start V-REP, then it will start remote API server services as described in the file remoteApiConnections.txt (by default a single service on port 19997 will be started).

But you can also start/stop the remote API server services as you need them, on the go, with following instruction from a script:

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simExtRemoteApiStart(portNumber)

You can read more here.

Cheers

Posted: **12 Apr 2017, 15:22**

OK, it works, thanks.
I would suggest to store those parameters in the ttt also, overriding the txt file if present.

Posted: **13 Apr 2017, 13:21**

That doesn't make sense. If you need to create specific remote API server services, then you should create them inside of your scene: inside of a child script (active only during simulation), or inside of a customization script (active as long as the object is present in the scene).

Cheers

CoppeliaSim forums

Second remoteApi client gets rejected

Second remoteApi client gets rejected

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