- Move all Strings to flash and optimize String usage, saving 4-5 kB of RAM.

- Replace const with constexpr where possible.

- Use default constructor instead of copy constructor for IPAddress variable initialization.

- Add MeshTypeConversionFunctions namespace around TypeConversionFunctions.

- Add MeshUtilityFunctions namespace around UtilityFunctions.

- Add ESP8266WIFIMESH_DISABLE_COMPATIBILITY preprocessor flag to retain compatibility with old code despite new namespaces.

- Add setLogEntryLifetimeMs and setBroadcastResponseTimeoutMs methods to EspnowMeshBackend.

- Move FloodingMesh constant definitions from header to .cpp file to reduce the risk of extra RAM consumption.

- Add deactivateAP method to FloodingMesh.

- Make deactivateAP static and add new non-static deactivateControlledAP method to MeshBackendBase.

- Add example of how to transfer null values using multiStrings to HelloEspnow.ino.

- Improve documentation.

- Improve comments.

libraries/ESP8266WiFiMesh/src/ESP8266WiFiMesh.cpp

@@ -48,6 +48,8 @@
 #include "ESP8266WiFiMesh.h"
 #include "TypeConversionFunctions.h"
 
+namespace TypeCast = MeshTypeConversionFunctions;
+
 #define SERVER_IP_ADDR      "192.168.4.1"
 
 const IPAddress ESP8266WiFiMesh::emptyIP = IPAddress();
@@ -74,7 +76,7 @@ ESP8266WiFiMesh::ESP8266WiFiMesh(ESP8266WiFiMesh::requestHandlerType requestHand
                                  const String &nodeID, bool verboseMode, uint8 meshWiFiChannel, uint16_t serverPort) 
                                  : _server(serverPort)
 {  
-  updateNetworkNames(meshName, (nodeID != "" ? nodeID : uint64ToString(ESP.getChipId())));
+  updateNetworkNames(meshName, (nodeID != "" ? nodeID : TypeCast::uint64ToString(ESP.getChipId())));
   _requestHandler = requestHandler;
   _responseHandler = responseHandler;
   setWiFiChannel(meshWiFiChannel);