neither update last found timestamp nor empty last found value if decoding failed, added decode() for combined master/slave decoding

src/lib/ebus/message.cpp

@@ -315,13 +315,12 @@ result_t Message::decode(const PartType partType, SymbolString& data,
 		offset = m_id.size() - 2;
 	else
 		offset = 0;
-	int startPos = output.str().length();
+	size_t startPos = output.str().length();
 	result_t result = m_data->read(partType, data, offset, output, leadingSeparator, verbose, filterName, separator);
-	time(&m_lastUpdateTime);
 	if (result < RESULT_OK) {
-		m_lastValue.clear();
 		return result;
 	}
+	time(&m_lastUpdateTime);
 	m_lastValue = output.str().substr(startPos);
 	/*if (m_isPassive == false && answer == true) {
 		istringstream input; // TODO create input from database of internal variables
@@ -332,6 +331,28 @@ result_t Message::decode(const PartType partType, SymbolString& data,
 	return RESULT_OK;
 }
 
+result_t Message::decode(SymbolString& masterData, SymbolString& slaveData,
+		ostringstream& output, bool leadingSeparator,
+		bool verbose, const char* filterName,
+		char separator)
+{
+	unsigned char offset = m_id.size() - 2;
+	size_t startPos = output.str().length();
+	result_t result = m_data->read(pt_masterData, masterData, offset, output, leadingSeparator, verbose, filterName, separator);
+	if (result < RESULT_OK) {
+		return result;
+	}
+	offset = 0;
+	leadingSeparator = output.str().length() > startPos;
+	result = m_data->read(pt_slaveData, slaveData, offset, output, leadingSeparator, verbose, filterName, separator);
+	if (result < RESULT_OK) {
+		return result;
+	}
+	time(&m_lastUpdateTime);
+	m_lastValue = output.str().substr(startPos);
+	return RESULT_OK;
+}
+
 bool Message::isLessPollWeight(const Message* other)
 {
 	unsigned int tw = m_pollPriority * m_pollCount;

src/lib/ebus/message.h

@@ -176,7 +176,7 @@ public:
 	result_t prepareSlave(SymbolString& slaveData);
 
 	/**
-	 * @brief Decode a received message.
+	 * @brief Decode a singular part of a received message.
 	 * @param partType the @a PartType of the data.
 	 * @param data the unescaped data @a SymbolString for reading binary data.
 	 * @param output the @a ostringstream to append the formatted value to.
@@ -192,6 +192,23 @@ public:
 			bool verbose=false, const char* filterName=NULL,
 			char separator=UI_FIELD_SEPARATOR);
 
+	/**
+	 * @brief Decode all parts of a received message.
+	 * @param masterData the unescaped master data @a SymbolString to decode.
+	 * @param slaveData the unescaped slave data @a SymbolString to decode.
+	 * @param output the @a ostringstream to append the formatted value to.
+	 * @param leadingSeparator whether to prepend a separator before the formatted value.
+	 * @param verbose whether to prepend the name, append the unit (if present), and append
+	 * the comment in square brackets (if present).
+	 * @param filterName the optional name of a field to limit the output to.
+	 * @param separator the separator character between multiple fields.
+	 * @return @a RESULT_OK on success, or an error code.
+	 */
+	result_t decode(SymbolString& masterData, SymbolString& slaveData,
+			ostringstream& output, bool leadingSeparator=false,
+			bool verbose=false, const char* filterName=NULL,
+			char separator=UI_FIELD_SEPARATOR);
+
 	/**
 	 * @brief Get the last decoded value.
 	 * @return the last decoded value, or the empty string if it was not successful.

src/lib/ebus/test/test_message.cpp

@@ -151,9 +151,7 @@ int main()
 		SymbolString writeMstr;
 		if (message->isPassive() == true) {
 			ostringstream output;
-			result = message->decode(pt_masterData, mstr, output);
+			result = message->decode(mstr, sstr, output);
-			if (result == RESULT_OK)
-				result = message->decode(pt_slaveData, sstr, output, output.str().empty() == false);
 			if (result != RESULT_OK) {
 				cout << "  \"" << inputStr << "\": decode error: "
 						<< getResultCode(result) << endl;