Add API to retrieve Leader Data information. (#231)

include/openthread-types.h

@@ -452,6 +452,19 @@ typedef struct otEidCacheEntry
     bool            mValid : 1;       ///< Indicates whether or not the cache entry is valid
 } otEidCacheEntry;
 
+/**
+ * This structure represents the Thread Leader Data.
+ *
+ */
+typedef struct otLeaderData
+{
+    uint32_t mPartitionId;            ///< Partition ID
+    uint8_t mWeighting;               ///< Leader Weight
+    uint8_t mDataVersion;             ///< Full Network Data Version
+    uint8_t mStableDataVersion;       ///< Stable Network Data Version
+    uint8_t mLeaderRouterId;          ///< Leader Router ID
+} otLeaderData;
+
 /**
  * This structure represents the MAC layer counters.
  */

include/openthread.h

@@ -929,6 +929,18 @@ otDeviceRole otGetDeviceRole(void);
  */
 ThreadError otGetEidCacheEntry(uint8_t aIndex, otEidCacheEntry *aEntry);
 
+/**
+ * This function get the Thread Leader Data.
+ *
+ * @param[out]  aLeaderData  A pointer to where the leader data is placed.
+ *
+ * @retval kThreadError_None         Successfully retrieved the leader data.
+ * @retval kThreadError_Detached     Not currently attached.
+ * @retval kThreadError_InvalidArgs  @p aLeaderData is NULL.
+ *
+ */
+ThreadError otGetLeaderData(otLeaderData *aLeaderData);
+
 /**
  * Get the Leader's Router ID.
  *