Add extended advertising support. (#72)

Adds support for advertising and connections with coded/2M PHY's.

Adds new classes `NimBLEExtAdvertising` and `NimBLEExtAdvertisement`.
When extended advertising is enabled the original advertising classes become unavailable and the new classes must be used.

Changed some return values for advertising methods for consistency with the new classes methods.

src/NimBLEDevice.cpp

@@ -69,7 +69,11 @@ NimBLEServer*   NimBLEDevice::m_pServer = nullptr;
 uint32_t        NimBLEDevice::m_passkey = 123456;
 bool            NimBLEDevice::m_synced = false;
 #if defined(CONFIG_BT_NIMBLE_ROLE_BROADCASTER)
+#  if CONFIG_BT_NIMBLE_EXT_ADV
+NimBLEExtAdvertising* NimBLEDevice::m_bleAdvertising = nullptr;
+#  else
 NimBLEAdvertising* NimBLEDevice::m_bleAdvertising = nullptr;
+#  endif
 #endif
 
 gap_event_handler           NimBLEDevice::m_customGapHandler = nullptr;
@@ -114,6 +118,45 @@ uint8_t                     NimBLEDevice::m_scanFilterMode = CONFIG_BTDM_SCAN_DU
 
 
 #if defined(CONFIG_BT_NIMBLE_ROLE_BROADCASTER)
+#  if CONFIG_BT_NIMBLE_EXT_ADV
+/**
+ * @brief Get the instance of the advertising object.
+ * @return A pointer to the advertising object.
+ */
+NimBLEExtAdvertising* NimBLEDevice::getAdvertising() {
+    if(m_bleAdvertising == nullptr) {
+        m_bleAdvertising = new NimBLEExtAdvertising();
+    }
+    return m_bleAdvertising;
+}
+
+
+/**
+ * @brief Convenience function to begin advertising.
+ * @param [in] inst_id The extended advertisement instance ID to start.
+ * @param [in] duration How long to advertise for in milliseconds, 0 = forever (default).
+ * @param [in] max_events Maximum number of advertisement events to send, 0 = no limit (default).
+ * @return True if advertising started successfully.
+ */
+bool NimBLEDevice::startAdvertising(uint8_t inst_id,
+                                    int duration,
+                                    int max_events) {
+    return getAdvertising()->start(inst_id, duration, max_events);
+} // startAdvertising
+
+
+/**
+ * @brief Convenience function to stop advertising a data set.
+ * @param [in] inst_id The extended advertisement instance ID to stop advertising.
+ * @return True if advertising stopped successfully.
+ */
+bool NimBLEDevice::stopAdvertising(uint8_t inst_id) {
+    return getAdvertising()->stop(inst_id);
+} // stopAdvertising
+
+#  endif
+
+#  if !CONFIG_BT_NIMBLE_EXT_ADV || defined(_DOXYGEN_)
 /**
  * @brief Get the instance of the advertising object.
  * @return A pointer to the advertising object.
@@ -128,17 +171,19 @@ NimBLEAdvertising* NimBLEDevice::getAdvertising() {
 
 /**
  * @brief Convenience function to begin advertising.
+ * @return True if advertising started successfully.
  */
-void NimBLEDevice::startAdvertising() {
-    getAdvertising()->start();
+bool NimBLEDevice::startAdvertising() {
+    return getAdvertising()->start();
 } // startAdvertising
-
+#  endif
 
 /**
- * @brief Convenience function to stop advertising.
+ * @brief Convenience function to stop all advertising.
+ * @return True if advertising stopped successfully.
  */
-void NimBLEDevice::stopAdvertising() {
-    getAdvertising()->stop();
+bool NimBLEDevice::stopAdvertising() {
+    return getAdvertising()->stop();
 } // stopAdvertising
 #endif // #if defined(CONFIG_BT_NIMBLE_ROLE_BROADCASTER)