diff --git a/libshvchainpack/src/rpcdriver.cpp b/libshvchainpack/src/rpcdriver.cpp
index 71d61899b..d998f07b3 100644
--- a/libshvchainpack/src/rpcdriver.cpp
+++ b/libshvchainpack/src/rpcdriver.cpp
@@ -49,7 +49,7 @@ void RpcDriver::sendRpcFrame(RpcFrame &&frame)
 			frame = msg.toToRpcFrame(m_clientProtocolType);
 		}
 		auto frame_data = frame.toFrameData();
-		logRpcData().nospace() << "FRAME DATA WRITE " << frame_data.size() << " bytes of data:\n" << shv::chainpack::utils::hexDump(frame_data);
+		//logRpcData().nospace() << "FRAME DATA WRITE " << frame_data.size() << " bytes of data:\n" << shv::chainpack::utils::hexDump(frame_data);
 		writeFrameData(frame_data);
 	}
 	catch (const std::exception &e) {
@@ -59,11 +59,6 @@ void RpcDriver::sendRpcFrame(RpcFrame &&frame)
 
 void RpcDriver::onFrameDataRead(const std::string &frame_data)
 {
-#ifdef _MSC_VER
-	logRpcData() << __FUNCSIG__ << "+++++++++++++++++++++++++++++++++";
-#else
-	logRpcData() << __PRETTY_FUNCTION__ << "+++++++++++++++++++++++++++++++++";
-#endif
 	logRpcData().nospace() << "FRAME DATA READ " << frame_data.size() << " bytes of data read:\n" << shv::chainpack::utils::hexDump(frame_data);
 	try {
 		auto frame = RpcFrame::fromFrameData(frame_data);
diff --git a/libshvchainpack/src/rpcmessage.cpp b/libshvchainpack/src/rpcmessage.cpp
index f68846358..1e7c7f569 100644
--- a/libshvchainpack/src/rpcmessage.cpp
+++ b/libshvchainpack/src/rpcmessage.cpp
@@ -52,13 +52,24 @@ void RpcMessage::MetaType::registerMetaType()
 //==================================================================
 RpcMessage RpcFrame::toRpcMessage(std::string *errmsg) const
 {
+	auto make_rpcmsg = [](const RpcValue &val, std::string *err_msg) {
+		try {
+			return RpcMessage(val);
+		}
+		catch (const std::exception &e) {
+			if (err_msg) {
+				*err_msg = e.what();
+			}
+		}
+		return RpcMessage();
+	};
 	switch (protocol) {
 	case Rpc::ProtocolType::ChainPack: {
 		auto val = RpcValue::fromChainPack(data, errmsg);
 		if (!errmsg || (errmsg && errmsg->empty())) {
 			auto m = meta;
 			val.setMetaData(std::move(m));
-			return RpcMessage(val);
+			return make_rpcmsg(val, errmsg);
 		}
 		break;
 	}
@@ -67,17 +78,21 @@ RpcMessage RpcFrame::toRpcMessage(std::string *errmsg) const
 		if (!errmsg || (errmsg && errmsg->empty())) {
 			auto m = meta;
 			val.setMetaData(std::move(m));
-			return RpcMessage(val);
+			return make_rpcmsg(val, errmsg);
 		}
 		break;
 	}
 	default: {
+		constexpr auto msg = "Invalid protocol type";
 		if (errmsg) {
-			*errmsg = "Invalid protocol type";
+			*errmsg = msg;
+		}
+		else {
+			throw std::runtime_error(msg);
 		}
-		return {};
 	}
 	}
+
 	return {};
 }
 
diff --git a/libshviotqt/src/rpc/serialportsocket.cpp b/libshviotqt/src/rpc/serialportsocket.cpp
index 25d79b943..2f075c4f5 100644
--- a/libshviotqt/src/rpc/serialportsocket.cpp
+++ b/libshviotqt/src/rpc/serialportsocket.cpp
@@ -12,6 +12,8 @@
 #define logSerialPortSocketM() nCMessage("SerialPortSocket")
 #define logSerialPortSocketW() nCWarning("SerialPortSocket")
 
+#define logRpcData() nCMessage("RpcData")
+
 using namespace std;
 
 namespace shv::iotqt::rpc {
@@ -38,7 +40,7 @@ SerialFrameReader::SerialFrameReader(CrcCheck crc)
 
 QList<int> SerialFrameReader::addData(std::string_view data)
 {
-	shvDebug() << "===> received:" << data.size() << "bytes:" << chainpack::utils::hexArray(data.data(), data.size());
+	logRpcData().nospace() << "FRAME DATA READ " << data.size() << " bytes of data read:\n" << shv::chainpack::utils::hexDump(data);
 	QList<int> response_request_ids;
 	auto check_response_id = [this, &response_request_ids]() {
 		std::istringstream in(m_readBuffer);
diff --git a/libshviotqt/src/rpc/socket.cpp b/libshviotqt/src/rpc/socket.cpp
index 0fc91d48a..8b8531da8 100644
--- a/libshviotqt/src/rpc/socket.cpp
+++ b/libshviotqt/src/rpc/socket.cpp
@@ -16,6 +16,8 @@
 #include <QWebSocket>
 #endif
 
+#define logRpcData() nCMessage("RpcData")
+
 namespace shv::iotqt::rpc {
 
 //======================================================
@@ -102,10 +104,10 @@ int FrameReader::tryToReadMeta(std::istringstream &in)
 //======================================================
 QList<int> StreamFrameReader::addData(std::string_view data)
 {
+	logRpcData().nospace() << "FRAME DATA READ " << data.size() << " bytes of data read:\n" << shv::chainpack::utils::hexDump(data);
 	using namespace chainpack;
 	QList<int> response_request_ids;
 	m_readBuffer += data;
-	shvDebug() << "received:\n" << utils::hexDump(data);
 	while (true) {
 		std::istringstream in(m_readBuffer);
 		int err_code;