Re: [sumo-user] Problems with TraCi Communication

[Jens F. <fa...@me...>]

Hi Dirk,

thanks for your advise, You were absolutely right. My Problem is  
solved now.


Regards,
Jens


On 29 Jun 2009, at 09:48, dir...@pe... wrote:

> Hello Jens,
>
> Well, I have never tried to send so many commands bundled, however,  
> just a few thoughts to make sure you are not failing at another point:
>
> >>first an integer incremented with each response
> >>second 0x0D
> >>and third 0x0C
>
> since you are asking for edge names to me this actually sounds like  
> a part of the response, namely : DomainID, Variable (Name),  
> Identifier (String)
>
> So just to make sure you interpret the response correctly,  
> regardless of the number of commands you are sending your response  
> should look like this:
>
> MsgLength	 - Integer
> First Part of Response
> CmdLength	 - ubyte
> CmdID	 - ubyte
> status	 - ubyte
> StringLength	- Integer (=0 if status == 0)
> Second Part of Response
> CmdLength	 - ubyte
> CmdID	 - ubyte
> flag	 - ubyte ( 0 since you are just reading values)
> Domain	 - ubyte (0 for road map)
> DomainID	 - Integer (i guess that's the increasing Integer value you  
> were referring to)
> Variable	 - ubyte (0D for name)
> ValueType	 - ubyte (0C for string since you are asking for the name)
> StringLength	- Integer
> Value	 - String
> [further responses consisting of 1st+2nd part]
>
>
> As i said, just a few thoughts, maybe it helps
>
> Best Regards,
>
> Dirk Leistner
> Traffic Engineering - Research Department
>
> Peek Traffic bv
> Basicweg 16
> Postbus 2542
> 3800 GB  Amersfoort
>
> http://www.peektraffic.eu
> <graycol.gif>Jens Fahnenbruck <fa...@me...>
>
>
> Jens Fahnenbruck <fa...@me...>
> 27-06-2009 20:50
>
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> [sumo-user] Problems with TraCi Communication
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>
> Hello,
>
> I am writing a traci client. And now I have some problems, and I hope
> someone out there can be helpfull.
>
> For reasons of speed I try to bundle a lot of cammands into one TCP
> packet. When I understood the message format correct, than we can put
> 2^32 bytes of commands in one message, right? because the message
> begins with an 32bit integer for message length:
> http://sourceforge.net/apps/mediawiki/sumo/index.php?title=TraCI/Protocol#Messages
>
> I am bundling 4000 commands @ 14 bytes in one message and now I get
> weird responses. On http://sourceforge.net/apps/mediawiki/sumo/index.php?title=TraCI/Protocol#Status_Response
>  it's said that there are 3 possible response types: 0x00, 0xff and
> 0x01, but I get an 0x0C What does that mean?
>
> And I also get only 256 responses. Could it be that I can't send more
> than 256 commands even if the length suggested I can send 2^32
> commands? The responses first 3 bytes look alway like this:
>
> first an integer incremented with each response
> second 0x0D
> and third 0x0C
>
> My Commands are all Scenario commands to ask the names of alle edges.
>
> Kind Regards
>
> Jens Fahnenbruck
>
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