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/NimBLEClient.cpp

@@ -65,6 +65,11 @@ NimBLEClient::NimBLEClient(const NimBLEAddress &peerAddress) : m_peerAddress(pee
     m_pTaskData        = nullptr;
     m_connEstablished  = false;
     m_lastErr          = 0;
+#if CONFIG_BT_NIMBLE_EXT_ADV
+    m_phyMask          = BLE_GAP_LE_PHY_1M_MASK |
+                         BLE_GAP_LE_PHY_2M_MASK |
+                         BLE_GAP_LE_PHY_CODED_MASK;
+#endif
 
     m_pConnParams.scan_itvl = 16;          // Scan interval in 0.625ms units (NimBLE Default)
     m_pConnParams.scan_window = 16;        // Scan window in 0.625ms units (NimBLE Default)
@@ -220,9 +225,22 @@ bool NimBLEClient::connect(const NimBLEAddress &address, bool deleteAttibutes) {
      *  Loop on BLE_HS_EBUSY if the scan hasn't stopped yet.
      */
     do {
+#if CONFIG_BT_NIMBLE_EXT_ADV
+        rc = ble_gap_ext_connect(NimBLEDevice::m_own_addr_type,
+                                 &peerAddr_t,
+                                 m_connectTimeout,
+                                 m_phyMask,
+                                 &m_pConnParams,
+                                 &m_pConnParams,
+                                 &m_pConnParams,
+                                 NimBLEClient::handleGapEvent,
+                                 this);
+
+#else
         rc = ble_gap_connect(NimBLEDevice::m_own_addr_type, &peerAddr_t,
                              m_connectTimeout, &m_pConnParams,
                              NimBLEClient::handleGapEvent, this);
+#endif
         switch (rc) {
             case 0:
                 break;
@@ -397,6 +415,21 @@ int NimBLEClient::disconnect(uint8_t reason) {
 } // disconnect
 
 
+#if CONFIG_BT_NIMBLE_EXT_ADV
+/**
+ * @brief Set the PHY types to use when connecting to a server.
+ * @param [in] mask A bitmask indicating what PHYS to connect with.\n
+ * The available bits are:
+ * * 0x01 BLE_GAP_LE_PHY_1M_MASK
+ * * 0x02 BLE_GAP_LE_PHY_2M_MASK
+ * * 0x04 BLE_GAP_LE_PHY_CODED_MASK
+ */
+void NimBLEClient::setConnectPhy(uint8_t mask) {
+    m_phyMask = mask;
+}
+#endif
+
+
 /**
  * @brief Set the connection paramaters to use when connecting to a server.
  * @param [in] minInterval The minimum connection interval in 1.25ms units.