Bugfix: clear the header after sending a packet solves a problem with fragmentation; also prod the watchdog since fragment transmissions can take a long time with some low-power MAC protocol

core/net/sicslowpan.c

@@ -32,7 +32,7 @@
  *
  * This file is part of the Contiki operating system.
  *
- * $Id: sicslowpan.c,v 1.12 2010/02/03 16:44:19 adamdunkels Exp $
+ * $Id: sicslowpan.c,v 1.13 2010/02/06 07:49:58 adamdunkels Exp $
  */
 /**
  * \file
@@ -1114,6 +1114,14 @@ send_packet(rimeaddr_t *dest)
    *         be to figure out how to get rid of delays entirely */
     sicslowpan_mac->send();
   }
+
+  /* If we are sending multiple packets in a row, we need to let the
+     watchdog know that we are still alive. */
+  watchdog_periodic();
+  
+  /* The MAC may add headers. We clear them here, since we may need to
+     resend (parts of) the packet during fragmentation. */
+  packetbuf_clear_hdr();
 }
 
 /** \brief Take an IP packet and format it to be sent on an 802.15.4