fix for storing own prepared master data, set m_lastUpdateTime only if reasonable data was seen

src/lib/ebus/message.cpp

@@ -497,12 +497,9 @@ result_t Message::prepareMaster(const unsigned char srcAddress, SymbolString& ma
 	result = prepareMasterPart(master, input, separator, index);
 	if (result != RESULT_OK)
 		return result;
-	result = storeLastData(pt_masterData, master, index);
-	if (result < RESULT_OK)
-		return result;
 	masterData.clear();
 	masterData.addAll(master);
-	return RESULT_OK;
+	return storeLastData(pt_masterData, masterData, index);
 }
 
 result_t Message::prepareMasterPart(SymbolString& master, istringstream& input, char separator, unsigned char index)
@@ -558,7 +555,9 @@ result_t Message::storeLastData(SymbolString& master, SymbolString& slave)
 
 result_t Message::storeLastData(const PartType partType, SymbolString& data, unsigned char index)
 {
-	time(&m_lastUpdateTime);
+	if (data.size() > 0 && (this->m_dstAddress == BROADCAST || partType == pt_slaveData)) {
+		time(&m_lastUpdateTime);
+	}
 	if (partType == pt_masterData) {
 		switch (data.compareMaster(m_lastMasterData)) {
 		case 1: // completely different

src/lib/ebus/message.h

@@ -396,14 +396,14 @@ public:
 	SymbolString& getLastSlaveData() { return m_lastSlaveData; }
 
 	/**
-	 * Get the time when @a m_lastValue was last stored.
+	 * Get the time when this message was last seen with reasonable data.
-	 * @return the time when @a m_lastValue was last stored, or 0 if this message was not decoded yet.
+	 * @return the time when this message was last seen, or 0.
 	 */
 	time_t getLastUpdateTime() { return m_lastUpdateTime; }
 
 	/**
-	 * Get the time when @a m_lastValue was last changed.
+	 * Get the time when the message data was last changed.
-	 * @return the time when @a m_lastValue was last changed, or 0 if this message was not decoded yet.
+	 * @return the time when the message data was last changed, or 0 if this message was not decoded yet.
 	 */
 	time_t getLastChangeTime() { return m_lastChangeTime; }