added getLastMasterData(), fix for storing last master data in prepareMaster()

src/lib/ebus/message.cpp

@@ -380,10 +380,10 @@ result_t Message::prepareMaster(const unsigned char srcAddress, SymbolString& ma
 	switch (master.compareMaster(m_lastMasterData)) {
 	case 1: // completely different
 		m_lastChangeTime = m_lastUpdateTime;
-		m_lastMasterData = masterData;
+		m_lastMasterData = master;
 		break;
 	case 2: // only master address is different
-		m_lastMasterData = masterData;
+		m_lastMasterData = master;
 		break;
 	}
 	masterData.addAll(master);

src/lib/ebus/message.h

@@ -265,6 +265,12 @@ public:
 	 */
 	result_t decodeLastDataField(unsigned int& output, const char* fieldName, signed char fieldIndex=-1);
 
+	/**
+	 * Get the last seen master data.
+	 * @return the last seen master @a SymbolString.
+	 */
+	SymbolString& getLastMasterData() { return m_lastMasterData; }
+
 	/**
 	 * Get the last seen slave data.
 	 * @return the last seen slave @a SymbolString.