Moved from CC2420 radio. See TEP 127.

diff --git a/tos/interfaces/PacketLink.nc b/tos/interfaces/PacketLink.nc
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+/*
+ * Copyright (c) 2005-2006 Rincon Research Corporation
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the
+ *   distribution.
+ * - Neither the name of the Rincon Research Corporation nor the names of
+ *   its contributors may be used to endorse or promote products derived
+ *   from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+ * RINCON RESEARCH OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE
+ */
+ 
+/**
+ * @author David Moss
+ * @author Jon Wyant
+ */
+
+interface PacketLink {
+
+  /**
+   * Set the maximum number of times attempt message delivery
+   * Default is 0
+   * @param msg
+   * @param maxRetries the maximum number of attempts to deliver
+   *     the message
+   */
+  command void setRetries(message_t *msg, uint16_t maxRetries);
+
+  /**
+   * Set a delay between each retry attempt
+   * @param msg
+   * @param retryDelay the delay betweeen retry attempts, in milliseconds
+   */
+  command void setRetryDelay(message_t *msg, uint16_t retryDelay);
+
+  /** 
+   * @return the maximum number of retry attempts for this message
+   */
+  command uint16_t getRetries(message_t *msg);
+
+  /**
+   * @return the delay between retry attempts in ms for this message
+   */
+  command uint16_t getRetryDelay(message_t *msg);
+
+  /**
+   * @return TRUE if the message was delivered.
+   */
+  command bool wasDelivered(message_t *msg);
+
+}
+
+