Bump docs version

* Add missing definition for default device callbacks (which prevents calling the `setDeviceCallbacks` method)
* Ensure `m_pDeviceCallbacks` inital value is set to `&defaultDeviceCallbacks` to prevent crash when pairing table is full

After #295 any time the pairing table fills up, the device will crash on the next pairing attempt.

src/NimBLEDevice.cpp

@@ -844,7 +844,7 @@ bool NimBLEDevice::init(const std::string& deviceName) {
     if (!m_initialized) {
 # ifdef ESP_PLATFORM
 
-#  if defined(CONFIG_ENABLE_ARDUINO_DEPENDS) && SOC_BT_SUPPORTED 
+#  ifdef CONFIG_ENABLE_ARDUINO_DEPENDS
         // make sure the linker includes esp32-hal-bt.c so Arduino init doesn't release BLE memory.
         btStarted();
 #  endif

src/NimBLEServer.cpp

@@ -620,10 +620,13 @@ int NimBLEServer::handleGattEvent(uint16_t connHandle, uint16_t attrHandle, ble_
     switch (ctxt->op) {
         case BLE_GATT_ACCESS_OP_READ_DSC:
         case BLE_GATT_ACCESS_OP_READ_CHR: {
-            // Don't call readEvent if the buffer len is 0 (this is a follow up to a previous read),
-            // or if this is an internal read (handle is NONE)
-            if (ctxt->om->om_len > 0 && connHandle != BLE_HS_CONN_HANDLE_NONE) {
-                pAtt->readEvent(peerInfo);
+            // Don't call readEvent if this is an internal read (handle is NONE)
+            if (connHandle != BLE_HS_CONN_HANDLE_NONE) {
+                // If the packet header is only 8 bytes then this is a follow up of a long read
+                // so we don't want to call the onRead() callback again.
+                if (ctxt->om->om_pkthdr_len > 8 || val.size() <= (ble_att_mtu(connHandle) - 3)) {
+                    pAtt->readEvent(peerInfo);
+                }
             }
 
             ble_npl_hw_enter_critical();