/**
- * Function called whenever a message is received.
+ * Check data message sanity. Does nothing so far (all messages are OK).
*
- * Each time the function must call #GNUNET_CADET_receive_done on the channel
- * in order to receive the next message. This doesn't need to be immediate:
- * can be delayed if some processing is done on the message.
- *
- * @param cls should match #ch
- * @param message The actual message.
+ * @param cls Closure (unused).
+ * @param message The message to check.
* @return #GNUNET_OK to keep the channel open,
* #GNUNET_SYSERR to close it (signal serious error).
*/