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Open topic with navigation CAPL Functions » TCP/IP API » OnIpReceivePrepare

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OnIpReceivePrepare

Valid for: CANoe DE • CANoe4SW DE

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Function Syntax

long OnIpReceivePrepare(ethernetPacket * packet);

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Description

If the CAPL program implements this callback, it is called right before a received packet will be dispatched to the TCP/IP stack. It is possible to manipulate the content of the packet or to block the receiving of the package from the bus. Note: The callback is only available for simulation nodes using the individual TCP/IP stack instance. Check this setting in the CANoe DE product TCP/IP Stack configuration dialog.

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Parameters

  • packet: The received Ethernet packet.

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Return Values

  • 0: Block the Ethernet packet.
  • 1: Pass the Ethernet packet to the TCP/IP stack.

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Example

long OnIpReceivePrepare(ethernetPacket * packet)
{
  // block all packets with a broadcast destination MAC id
  if(packet.destination == 0xFFFFFFFFFFFFLL)
  {
    write("packet blocked");
    return 0;
  }
  write("packet passed to tcp/ip stack");
  return 1;
}