- Rework ExpiringTimeTracker to be based on PolledTimeout.

- Ensure espnowDelay and floodingMeshDelay always performs maintenance.

- Rework MutexTracker to use shared_ptr.

- Change enums to enum class.

- Change typedef to using.

- Add HeapMonitor class.

- Make _messageIDs be a map instead of an unordered_map to reduce heap usage.

- Use the possibly broken wifi_country ESP8266 API to check for legal WiFi channels when setting WiFi channels.

- Make MessageData, RequestData and ResponseData contain a TimeTracker rather than inherit from TimeTracker.

- Add deprecated attribute to TransmissionResult.

- Remove superfluous elses.

- Reduce cyclomatic complexity.

- Change postfix ++ and -- to prefix.

- Generalize getEncryptedConnectionIterator method.

- Increase code NRVO compatibility.

- Change _connectionAttemptTimeoutMs type from int32_t to uint32_t.

- Add deprecated attribute to ESP8266WiFiMesh.

- Add some constness to TypeConversionFunctions.

- Move base36 arrays to PROGMEM in TypeConversionFunctions.cpp.

- Add deprecated atttribute to SHA1 and MD5 hashes.

- Remove _warningsEnabled in CryptoInterface since this has been replaced by the deprecated attribute.

- Prefix all TypeConversion getters with "get".

- Improve comments.

- Fix merge conflict.

libraries/ESP8266WiFiMesh/src/MessageData.cpp

@@ -28,15 +28,15 @@
 #include <assert.h>
 
 MessageData::MessageData(String &message, uint8_t transmissionsRemaining, uint32_t creationTimeMs) :
-  TimeTracker(creationTimeMs)
+  _timeTracker(creationTimeMs)
 {
   _transmissionsExpected = transmissionsRemaining + 1;
   _totalMessage += message;
-  _transmissionsReceived++;
+  ++_transmissionsReceived;
 }
 
 MessageData::MessageData(uint8_t *initialTransmission, uint8_t transmissionLength, uint32_t creationTimeMs) :
-  TimeTracker(creationTimeMs)
+  _timeTracker(creationTimeMs)
 {
   _transmissionsExpected = EspnowProtocolInterpreter::espnowGetTransmissionsRemaining(initialTransmission) + 1;
   addToMessage(initialTransmission, transmissionLength);
@@ -49,7 +49,7 @@ bool MessageData::addToMessage(uint8_t *transmission, uint8_t transmissionLength
     String message = EspnowProtocolInterpreter::espnowGetMessageContent(transmission, transmissionLength);
     assert(message.length() <= EspnowMeshBackend::getMaxMessageBytesPerTransmission()); // Should catch some cases where transmission is not null terminated.
     _totalMessage += message;
-    _transmissionsReceived++;
+    ++_transmissionsReceived;
     return true;
   }
 
@@ -75,3 +75,5 @@ String MessageData::getTotalMessage()
 {
   return _totalMessage;
 }
+
+const TimeTracker &MessageData::getTimeTracker() const { return _timeTracker; }