rfbcSendAck (Function)

This function will send a default acknowledgment packet based on the last received event.

Acknowledgments are always sent even if the last message was a broadcast or the interface is configured not to send acknowledgments (see rfbcSetConfig).

Note: acknowledgments should be sent as soon as possible to avoid the sender repeating the message.

Input:

None.

Output:

None.

Returns: INT

Declaration:

FUNCTION rfbcSendAck : INT;
 

Example:

INCLUDE rtcu.inc
 
//-----------------------------------------------------------------------------
// THREAD_BLOCK rfbcMonitor
//-----------------------------------------------------------------------------
THREAD_BLOCK rfbcMonitor;
VAR
  event       : INT := 0;
  hisId       : DINT;
  broadcast   : BOOL;
END_VAR;
 
WHILE event <> -1 DO
  event := rfbcWaitEvent(timeout := -1, id := hisId, broadcast := broadcast);
  CASE event OF
    ...
    100 :
        IF NOT broadcast THEN rfbcSendAck(); END_IF;
        GetRawEvent(id := hisId);
    ...
  ELSE
    DebugFmt(message := "rfbcWaitEvent - event=\1", v1 := event);
  END_CASE;
END_WHILE;
END_THREAD_BLOCK;