Transmitted Data is not to be received by other Application

Transmitted Data is not to be received by other Application

[Oliver Stefan]

I'm developing Software for the Raspberry Pi with MCP2515 extension.

I have two applications running the same time.
One is in the receiving mode, and the other can transmit and receive.
Unfortunately the application that is permanently receiving, receives 
the data of the second application too.

How can I turn off this function?

I read the helpfile
http://svn.berlios.de/wsvn/socketcan/trunk/kernel/2.6/Documentation/networking/can.txt 

but I don't see there any possibility to eleminate this function.

Thank you very much!

Re: Transmitted Data is not to be received by other Application

[Marc Kleine-Budde]

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On 03/28/2013 01:12 PM, Oliver Stefan wrote:
> I'm developing Software for the Raspberry Pi with MCP2515 extension.
> 
> I have two applications running the same time.
> One is in the receiving mode, and the other can transmit and receive.
> Unfortunately the application that is permanently receiving, receives
> the data of the second application too.
> 
> How can I turn off this function?

Have you tried this:

  4.1.3 RAW socket option CAN_RAW_LOOPBACK

  To meet multi user needs the local loopback is enabled by default
  (see chapter 3.2 for details). But in some embedded use-cases
  (e.g. when only one application uses the CAN bus) this loopback
  functionality can be disabled (separately for each socket):

    int loopback = 0; /* 0 = disabled, 1 = enabled (default) */

    setsockopt(s, SOL_CAN_RAW, CAN_RAW_LOOPBACK, &loopback, sizeof(loopback));

Marc
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