Add Joiner UDP Port feature (#676)

* Add Joiner UDP Port feature

  - Add 'joinerport' cli for configuration

  - Include Joiner UDP Port TLV in discovery response message

  - Joiner use it as destination port during commissioning process

include/openthread-types.h

@@ -302,6 +302,7 @@ typedef struct otActiveScanResult
     otNetworkName   mNetworkName;     ///< Thread Network Name
     otExtendedPanId mExtendedPanId;   ///< Thread Extended PAN ID
     uint16_t        mPanId;           ///< IEEE 802.15.4 PAN ID
+    uint16_t        mJoinerUdpPort;   ///< Joiner UDP Port
     uint8_t         mChannel;         ///< IEEE 802.15.4 Channel
     int8_t          mRssi;            ///< RSSI (dBm)
     uint8_t         mLqi;             ///< LQI

include/openthread.h

@@ -985,6 +985,29 @@ uint32_t otGetLocalLeaderPartitionId(otInstance *aInstance);
  */
 void otSetLocalLeaderPartitionId(otInstance *aInstance, uint32_t aPartitionId);
 
+/**
+ * Get the Joiner UDP Port.
+ *
+ * @param[in] aInstance A pointer to an OpenThread instance.
+ *
+ * @returns The Joiner UDP Port number.
+ *
+ * @sa otSetJoinerUdpPort
+ */
+uint16_t otGetJoinerUdpPort(otInstance *aInstance);
+
+/**
+ * Set the Joiner UDP Port
+ *
+ * @param[in]  aInstance       A pointer to an OpenThread instance.
+ * @param[in]  aJoinerUdpPort  The Joiner UDP Port number.
+ *
+ * @retval  kThreadErrorNone   Successfully set the Joiner UDP Port.
+ *
+ * @sa otGetJoinerUdpPort
+ */
+ThreadError otSetJoinerUdpPort(otInstance *aInstance, uint16_t aJoinerUdpPort);
+
 /**
  * @}
  */