fix compilation on espressif8266

Author: matth-x

.github/workflows/platformless.yml

@@ -26,4 +26,4 @@ jobs:
     - name: Get ArduinoJson
       run: wget -Uri https://github.com/bblanchon/ArduinoJson/releases/download/v6.19.4/ArduinoJson-v6.19.4.h -O ./src/ArduinoJson.h
     - name: Compile
-      run: g++ -c -std=c++11 -I ./src $(find ./src -type f -iregex ".*\.cpp") -DMO_PLATFORM=MO_PLATFORM_NONE -Wall -Wextra -Wno-unused-parameter -Werror
+      run: g++ -c -std=c++11 -I ./src $(find ./src -type f -iregex ".*\.cpp") -DMO_PLATFORM=MO_PLATFORM_NONE -Wall -Wextra -Wno-unused-parameter -Wno-redundant-move -Werror

src/MicroOcpp/Model/Metering/MeteringConnector.cpp

@@ -59,7 +59,7 @@ std::unique_ptr<Operation> MeteringConnector::loop() {
     if ((txBreak || meterData.size() >= (size_t) meterValueCacheSizeInt->getInt()) && !meterData.empty()) {
         auto meterValues = std::unique_ptr<MeterValues>(new MeterValues(std::move(meterData), connectorId, transaction));
         meterData.clear();
-        return meterValues;
+        return std::move(meterValues);
     }
 
     if (model.getConnector(connectorId)) {