Added support for directed BLE advertisements.

Can be used for example with advertising type BLE_GAP_ADV_TYPE_CONNECTABLE_NONSCANNABLE_DIRECTED.

libraries/Bluefruit52Lib/src/BLEAdvertising.cpp

@@ -265,6 +265,7 @@ BLEAdvertising::BLEAdvertising(void)
   _stop_timeout        = _left_timeout = 0;
   _stop_cb             = NULL;
   _slow_cb             = NULL;
+  _directed            = false; // Broadcast advertising is the default
 }
 
 void BLEAdvertising::setFastTimeout(uint16_t sec)
@@ -315,6 +316,17 @@ void BLEAdvertising::setStopCallback(stop_callback_t fp)
   _stop_cb = fp;
 }
 
+void BLEAdvertising::setPeerAddress(const ble_gap_addr_t& peer_addr)
+{
+    _directed  = true;
+    _peer_addr = peer_addr; // Copy address, used later in start function
+}
+
+void BLEAdvertising::removePeerAddress()
+{
+    _directed = false;
+}
+
 bool BLEAdvertising::isRunning(void)
 {
   return _runnning;
@@ -354,6 +366,11 @@ bool BLEAdvertising::_start(uint16_t interval, uint16_t timeout)
       // , .set_id, .scan_req_notification
   };
 
+  if (_directed) {
+      // Set target address when not using broadcasting
+      adv_para.p_peer_addr = &_peer_addr;
+  }
+
   // gap_adv long-live is required by SD v6
   static ble_gap_adv_data_t gap_adv =
   {
@@ -464,5 +481,4 @@ void BLEAdvertising::_eventHandler(ble_evt_t* evt)
 
     default: break;
   }
-}
-
+}

libraries/Bluefruit52Lib/src/BLEAdvertising.h

@@ -134,6 +134,12 @@ class BLEAdvertising : public BLEAdvertisingData
   bool setBeacon(BLEBeacon& beacon);
   bool setBeacon(EddyStoneUrl& eddy_url);
 
+  /// Advertise to a single peer instead of broadcasting
+  void setPeerAddress(const ble_gap_addr_t& peer_addr);
+
+  /// Revert to broadcast advertising
+  void removePeerAddress();
+
   bool isRunning(void);
 
   void restartOnDisconnect(bool enable);
@@ -152,6 +158,8 @@ class BLEAdvertising : public BLEAdvertisingData
   uint8_t  _type;
   bool     _start_if_disconnect;
   bool     _runnning;
+  ble_gap_addr_t _peer_addr; //! Target address for an ADV_DIRECT_IND advertisement
+  bool _directed;            //! Whether the advertisements are directed or broadcast
 
   uint32_t _conn_mask;