diff --git a/Source/.codex b/Source/.codex
new file mode 100644
index 0000000..e69de29
diff --git a/Source/bin/windowsSettings.ini b/Source/bin/windowsSettings.ini
index 0009505..a7c66b6 100644
--- a/Source/bin/windowsSettings.ini
+++ b/Source/bin/windowsSettings.ini
@@ -1,3 +1,3 @@
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diff --git a/Source/cudaSDR.pri b/Source/cudaSDR.pri
index 9bd73d5..07dce19 100644
--- a/Source/cudaSDR.pri
+++ b/Source/cudaSDR.pri
@@ -26,6 +26,7 @@ HEADERS += \
 	./src/DataEngine/cusdr_dataIO.h \
         ./src/DataEngine/cusdr_discoverer_P1.h \
         ./src/DataEngine/cusdr_discoverer_P2.h \
+	./src/DataEngine/cusdr_protocol2_io.h \
 	./src/DataEngine/cusdr_receiver.h \
 	./src/DataEngine/soundout.h \
 	./src/DataEngine/fractresampler.h \
@@ -102,6 +103,7 @@ HEADERS += \
         ./src/DataEngine/cusdr_dataIO.h \
         ./src/DataEngine/cusdr_discoverer_P1.h \
         ./src/DataEngine/cusdr_discoverer_P2.h \
+        ./src/DataEngine/cusdr_protocol2_io.h \
         ./src/DataEngine/cusdr_receiver.h \
         ./src/DataEngine/soundout.h \
         ./src/DataEngine/fractresampler.h \
@@ -176,6 +178,7 @@ SOURCES += \
 	./src/DataEngine/cusdr_dataIO.cpp \
         ./src/DataEngine/cusdr_discoverer_P1.cpp \
         ./src/DataEngine/cusdr_discoverer_P2.cpp \
+	./src/DataEngine/cusdr_protocol2_io.cpp \
 	./src/DataEngine/cusdr_receiver.cpp \
 	./src/DataEngine/soundout.cpp \
 	./src/DataEngine/fractresampler.cpp \
@@ -245,6 +248,7 @@ SOURCES += \
         ./src/DataEngine/cusdr_dataIO.cpp \
         ./src/DataEngine/cusdr_discoverer_P1.cpp \
         ./src/DataEngine/cusdr_discoverer_P2.cpp \
+        ./src/DataEngine/cusdr_protocol2_io.cpp \
         ./src/DataEngine/cusdr_receiver.cpp \
         ./src/DataEngine/soundout.cpp \
         ./src/DataEngine/fractresampler.cpp \
diff --git a/Source/cudaSDR.pro.user b/Source/cudaSDR.pro.user
index 8a8617a..4f1b7b6 100644
--- a/Source/cudaSDR.pro.user
+++ b/Source/cudaSDR.pro.user
@@ -1,10 +1,10 @@
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    <value type="bool" key="EditorConfiguration.AutoIndent">true</value>
-   <value type="bool" key="EditorConfiguration.AutoSpacesForTabs">false</value>
    <value type="bool" key="EditorConfiguration.CamelCaseNavigation">true</value>
    <valuemap type="QVariantMap" key="EditorConfiguration.CodeStyle.0">
     <value type="QString" key="language">Cpp</value>
@@ -33,6 +33,7 @@
    <value type="bool" key="EditorConfiguration.ConstrainTooltips">false</value>
    <value type="int" key="EditorConfiguration.IndentSize">4</value>
    <value type="bool" key="EditorConfiguration.KeyboardTooltips">false</value>
+   <value type="int" key="EditorConfiguration.LineEndingBehavior">0</value>
    <value type="int" key="EditorConfiguration.MarginColumn">80</value>
    <value type="bool" key="EditorConfiguration.MouseHiding">true</value>
    <value type="bool" key="EditorConfiguration.MouseNavigation">true</value>
@@ -49,7 +50,7 @@
    <value type="bool" key="EditorConfiguration.UseGlobal">true</value>
    <value type="bool" key="EditorConfiguration.UseIndenter">false</value>
    <value type="int" key="EditorConfiguration.Utf8BomBehavior">1</value>
-   <value type="bool" key="EditorConfiguration.addFinalNewLine">true</value>
+   <value type="bool" key="EditorConfiguration.addFinalNewLine">false</value>
    <value type="bool" key="EditorConfiguration.cleanIndentation">true</value>
    <value type="bool" key="EditorConfiguration.cleanWhitespace">true</value>
    <value type="QString" key="EditorConfiguration.ignoreFileTypes">*.md, *.MD, Makefile</value>
@@ -69,7 +70,9 @@
     <value type="bool" key="AutoTest.Framework.QtQuickTest">true</value>
     <value type="bool" key="AutoTest.Framework.QtTest">true</value>
    </valuemap>
+   <value type="bool" key="AutoTest.ApplyFilter">false</value>
    <valuemap type="QVariantMap" key="AutoTest.CheckStates"/>
+   <valuelist type="QVariantList" key="AutoTest.PathFilters"/>
    <value type="int" key="AutoTest.RunAfterBuild">0</value>
    <value type="bool" key="AutoTest.UseGlobal">true</value>
    <valuemap type="QVariantMap" key="ClangTools">
@@ -83,22 +86,24 @@
     <valuelist type="QVariantList" key="ClangTools.SuppressedDiagnostics"/>
     <value type="bool" key="ClangTools.UseGlobalSettings">true</value>
    </valuemap>
+   <value type="int" key="RcSync">0</value>
   </valuemap>
  </data>
  <data>
   <variable>ProjectExplorer.Project.Target.0</variable>
   <valuemap type="QVariantMap">
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-   <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Desktop Qt 5.15.2 MinGW 64-bit</value>
-   <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">qt.qt5.5152.win64_mingw81_kit</value>
+   <value type="bool" key="HasPerBcDcs">true</value>
+   <value type="QString" key="ProjectExplorer.ProjectConfiguration.DefaultDisplayName">Qt 5.15.18 (Системная)</value>
+   <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Qt 5.15.18 (Системная)</value>
+   <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">{f03c686f-a66c-435e-a263-3d02bc565002}</value>
    <value type="qlonglong" key="ProjectExplorer.Target.ActiveBuildConfiguration">0</value>
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    <valuemap type="QVariantMap" key="ProjectExplorer.Target.BuildConfiguration.0">
     <value type="int" key="EnableQmlDebugging">0</value>
-    <value type="QString" key="ProjectExplorer.BuildConfiguration.BuildDirectory">C:\Users\karpe\Documents\source\cudaSDR\Source\build\Debug</value>
-    <value type="QString" key="ProjectExplorer.BuildConfiguration.BuildDirectory.shadowDir">C:/Users/karpe/Documents/source/cudaSDR/Source/build/Debug</value>
+    <value type="QString" key="ProjectExplorer.BuildConfiguration.BuildDirectory">./build/%{Asciify:%{Kit:FileSystemName}-%{BuildConfig:Name}}</value>
+    <value type="QString" key="ProjectExplorer.BuildConfiguration.BuildDirectory.shadowDir">build/Qt_5_15_18-u041eu0442u043bu0430u0434u043au0430</value>
     <valuemap type="QVariantMap" key="ProjectExplorer.BuildConfiguration.BuildStepList.0">
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@@ -133,11 +138,46 @@
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     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Отладка</value>
     <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">Qt4ProjectManager.Qt4BuildConfiguration</value>
+    <value type="qlonglong" key="ProjectExplorer.Target.ActiveDeployConfiguration">0</value>
+    <value type="qlonglong" key="ProjectExplorer.Target.ActiveRunConfiguration">0</value>
+    <valuemap type="QVariantMap" key="ProjectExplorer.Target.DeployConfiguration.0">
+     <valuemap type="QVariantMap" key="ProjectExplorer.BuildConfiguration.BuildStepList.0">
+      <value type="qlonglong" key="ProjectExplorer.BuildStepList.StepsCount">0</value>
+      <value type="QString" key="ProjectExplorer.ProjectConfiguration.DefaultDisplayName">Развёртывание</value>
+      <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Развёртывание</value>
+      <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">ProjectExplorer.BuildSteps.Deploy</value>
+     </valuemap>
+     <value type="int" key="ProjectExplorer.BuildConfiguration.BuildStepListCount">1</value>
+     <valuemap type="QVariantMap" key="ProjectExplorer.DeployConfiguration.CustomData"/>
+     <value type="bool" key="ProjectExplorer.DeployConfiguration.CustomDataEnabled">false</value>
+     <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">ProjectExplorer.DefaultDeployConfiguration</value>
+    </valuemap>
+    <value type="qlonglong" key="ProjectExplorer.Target.DeployConfigurationCount">1</value>
+    <valuemap type="QVariantMap" key="ProjectExplorer.Target.RunConfiguration.0">
+     <value type="bool" key="Analyzer.Perf.Settings.UseGlobalSettings">true</value>
+     <value type="bool" key="Analyzer.QmlProfiler.Settings.UseGlobalSettings">true</value>
+     <value type="int" key="Analyzer.Valgrind.Callgrind.CostFormat">0</value>
+     <value type="bool" key="Analyzer.Valgrind.Settings.UseGlobalSettings">true</value>
+     <valuelist type="QVariantList" key="Analyzer.Valgrind.SuppressionFiles"/>
+     <valuelist type="QVariantList" key="CustomOutputParsers"/>
+     <value type="int" key="PE.EnvironmentAspect.Base">2</value>
+     <valuelist type="QVariantList" key="PE.EnvironmentAspect.Changes"/>
+     <value type="bool" key="PE.EnvironmentAspect.PrintOnRun">false</value>
+     <value type="QString" key="PerfRecordArgsId">-e cpu-cycles --call-graph dwarf,4096 -F 250</value>
+     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName"></value>
+     <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">ProjectExplorer.CustomExecutableRunConfiguration</value>
+     <value type="QString" key="ProjectExplorer.RunConfiguration.BuildKey"></value>
+     <value type="bool" key="ProjectExplorer.RunConfiguration.Customized">false</value>
+     <value type="QString" key="ProjectExplorer.RunConfiguration.UniqueId"></value>
+     <value type="bool" key="RunConfiguration.UseCppDebuggerAuto">true</value>
+     <value type="bool" key="RunConfiguration.UseQmlDebuggerAuto">true</value>
+     <value type="QString" key="RunConfiguration.WorkingDirectory.default">%{RunConfig:Executable:Path}</value>
+    </valuemap>
+    <value type="qlonglong" key="ProjectExplorer.Target.RunConfigurationCount">1</value>
     <value type="int" key="Qt4ProjectManager.Qt4BuildConfiguration.BuildConfiguration">2</value>
    </valuemap>
    <valuemap type="QVariantMap" key="ProjectExplorer.Target.BuildConfiguration.1">
-    <value type="QString" key="ProjectExplorer.BuildConfiguration.BuildDirectory">C:\Users\karpe\Documents\source\cudaSDR\Source\build\Release</value>
-    <value type="QString" key="ProjectExplorer.BuildConfiguration.BuildDirectory.shadowDir">C:/Users/karpe/Documents/source/cudaSDR/Source/build/Release</value>
+    <value type="QString" key="ProjectExplorer.BuildConfiguration.BuildDirectory">/home/vladimir/Документы/source/cudaSDR/Source</value>
     <valuemap type="QVariantMap" key="ProjectExplorer.BuildConfiguration.BuildStepList.0">
      <valuemap type="QVariantMap" key="ProjectExplorer.BuildStepList.Step.0">
       <value type="bool" key="ProjectExplorer.BuildStep.Enabled">true</value>
@@ -170,54 +210,47 @@
     <valuelist type="QVariantList" key="ProjectExplorer.BuildConfiguration.CustomParsers"/>
     <value type="bool" key="ProjectExplorer.BuildConfiguration.ParseStandardOutput">false</value>
     <valuelist type="QVariantList" key="ProjectExplorer.BuildConfiguration.UserEnvironmentChanges"/>
-    <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Выпуск</value>
+    <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Выпуск (imported)</value>
     <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">Qt4ProjectManager.Qt4BuildConfiguration</value>
-    <value type="int" key="Qt4ProjectManager.Qt4BuildConfiguration.BuildConfiguration">0</value>
-    <value type="int" key="QtQuickCompiler">0</value>
-   </valuemap>
-   <valuemap type="QVariantMap" key="ProjectExplorer.Target.BuildConfiguration.2">
-    <value type="int" key="EnableQmlDebugging">0</value>
-    <value type="QString" key="ProjectExplorer.BuildConfiguration.BuildDirectory">C:\Users\karpe\Documents\source\cudaSDR\Source\build\Profile</value>
-    <value type="QString" key="ProjectExplorer.BuildConfiguration.BuildDirectory.shadowDir">C:/Users/karpe/Documents/source/cudaSDR/Source/build/Profile</value>
-    <valuemap type="QVariantMap" key="ProjectExplorer.BuildConfiguration.BuildStepList.0">
-     <valuemap type="QVariantMap" key="ProjectExplorer.BuildStepList.Step.0">
-      <value type="bool" key="ProjectExplorer.BuildStep.Enabled">true</value>
-      <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">QtProjectManager.QMakeBuildStep</value>
-      <value type="bool" key="QtProjectManager.QMakeBuildStep.QMakeForced">false</value>
-      <valuelist type="QVariantList" key="QtProjectManager.QMakeBuildStep.SelectedAbis"/>
+    <value type="qlonglong" key="ProjectExplorer.Target.ActiveDeployConfiguration">0</value>
+    <value type="qlonglong" key="ProjectExplorer.Target.ActiveRunConfiguration">0</value>
+    <valuemap type="QVariantMap" key="ProjectExplorer.Target.DeployConfiguration.0">
+     <valuemap type="QVariantMap" key="ProjectExplorer.BuildConfiguration.BuildStepList.0">
+      <value type="qlonglong" key="ProjectExplorer.BuildStepList.StepsCount">0</value>
+      <value type="QString" key="ProjectExplorer.ProjectConfiguration.DefaultDisplayName">Развёртывание</value>
+      <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Развёртывание</value>
+      <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">ProjectExplorer.BuildSteps.Deploy</value>
      </valuemap>
-     <valuemap type="QVariantMap" key="ProjectExplorer.BuildStepList.Step.1">
-      <value type="bool" key="ProjectExplorer.BuildStep.Enabled">true</value>
-      <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">Qt4ProjectManager.MakeStep</value>
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-     <value type="qlonglong" key="ProjectExplorer.BuildStepList.StepsCount">2</value>
-     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DefaultDisplayName">Сборка</value>
-     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Сборка</value>
-     <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">ProjectExplorer.BuildSteps.Build</value>
+     <value type="int" key="ProjectExplorer.BuildConfiguration.BuildStepListCount">1</value>
+     <valuemap type="QVariantMap" key="ProjectExplorer.DeployConfiguration.CustomData"/>
+     <value type="bool" key="ProjectExplorer.DeployConfiguration.CustomDataEnabled">false</value>
+     <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">ProjectExplorer.DefaultDeployConfiguration</value>
     </valuemap>
-    <valuemap type="QVariantMap" key="ProjectExplorer.BuildConfiguration.BuildStepList.1">
-     <valuemap type="QVariantMap" key="ProjectExplorer.BuildStepList.Step.0">
-      <value type="bool" key="ProjectExplorer.BuildStep.Enabled">true</value>
-      <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">Qt4ProjectManager.MakeStep</value>
-      <value type="QString" key="Qt4ProjectManager.MakeStep.MakeArguments">clean</value>
-     </valuemap>
-     <value type="qlonglong" key="ProjectExplorer.BuildStepList.StepsCount">1</value>
-     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DefaultDisplayName">Очистка</value>
-     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Очистка</value>
-     <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">ProjectExplorer.BuildSteps.Clean</value>
+    <value type="qlonglong" key="ProjectExplorer.Target.DeployConfigurationCount">1</value>
+    <valuemap type="QVariantMap" key="ProjectExplorer.Target.RunConfiguration.0">
+     <value type="bool" key="Analyzer.Perf.Settings.UseGlobalSettings">true</value>
+     <value type="bool" key="Analyzer.QmlProfiler.Settings.UseGlobalSettings">true</value>
+     <value type="int" key="Analyzer.Valgrind.Callgrind.CostFormat">0</value>
+     <value type="bool" key="Analyzer.Valgrind.Settings.UseGlobalSettings">true</value>
+     <valuelist type="QVariantList" key="Analyzer.Valgrind.SuppressionFiles"/>
+     <valuelist type="QVariantList" key="CustomOutputParsers"/>
+     <value type="int" key="PE.EnvironmentAspect.Base">2</value>
+     <valuelist type="QVariantList" key="PE.EnvironmentAspect.Changes"/>
+     <value type="bool" key="PE.EnvironmentAspect.PrintOnRun">false</value>
+     <value type="QString" key="PerfRecordArgsId">-e cpu-cycles --call-graph dwarf,4096 -F 250</value>
+     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName"></value>
+     <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">ProjectExplorer.CustomExecutableRunConfiguration</value>
+     <value type="QString" key="ProjectExplorer.RunConfiguration.BuildKey"></value>
+     <value type="bool" key="ProjectExplorer.RunConfiguration.Customized">false</value>
+     <value type="QString" key="ProjectExplorer.RunConfiguration.UniqueId"></value>
+     <value type="bool" key="RunConfiguration.UseCppDebuggerAuto">true</value>
+     <value type="bool" key="RunConfiguration.UseQmlDebuggerAuto">true</value>
+     <value type="QString" key="RunConfiguration.WorkingDirectory.default">%{RunConfig:Executable:Path}</value>
     </valuemap>
-    <value type="int" key="ProjectExplorer.BuildConfiguration.BuildStepListCount">2</value>
-    <value type="bool" key="ProjectExplorer.BuildConfiguration.ClearSystemEnvironment">false</value>
-    <valuelist type="QVariantList" key="ProjectExplorer.BuildConfiguration.CustomParsers"/>
-    <value type="bool" key="ProjectExplorer.BuildConfiguration.ParseStandardOutput">false</value>
-    <valuelist type="QVariantList" key="ProjectExplorer.BuildConfiguration.UserEnvironmentChanges"/>
-    <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Профилирование</value>
-    <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">Qt4ProjectManager.Qt4BuildConfiguration</value>
+    <value type="qlonglong" key="ProjectExplorer.Target.RunConfigurationCount">1</value>
     <value type="int" key="Qt4ProjectManager.Qt4BuildConfiguration.BuildConfiguration">0</value>
-    <value type="int" key="QtQuickCompiler">0</value>
-    <value type="int" key="SeparateDebugInfo">0</value>
    </valuemap>
-   <value type="qlonglong" key="ProjectExplorer.Target.BuildConfigurationCount">3</value>
+   <value type="qlonglong" key="ProjectExplorer.Target.BuildConfigurationCount">2</value>
    <valuemap type="QVariantMap" key="ProjectExplorer.Target.DeployConfiguration.0">
     <valuemap type="QVariantMap" key="ProjectExplorer.BuildConfiguration.BuildStepList.0">
      <value type="qlonglong" key="ProjectExplorer.BuildStepList.StepsCount">0</value>
@@ -236,17 +269,20 @@
     <value type="bool" key="Analyzer.QmlProfiler.Settings.UseGlobalSettings">true</value>
     <value type="int" key="Analyzer.Valgrind.Callgrind.CostFormat">0</value>
     <value type="bool" key="Analyzer.Valgrind.Settings.UseGlobalSettings">true</value>
+    <valuelist type="QVariantList" key="Analyzer.Valgrind.SuppressionFiles"/>
     <valuelist type="QVariantList" key="CustomOutputParsers"/>
     <value type="int" key="PE.EnvironmentAspect.Base">2</value>
     <valuelist type="QVariantList" key="PE.EnvironmentAspect.Changes"/>
     <value type="bool" key="PE.EnvironmentAspect.PrintOnRun">false</value>
-    <value type="QString" key="PerfRecordArgsId">-e cpu-cycles --call-graph &quot;dwarf,4096&quot; -F 250</value>
+    <value type="QString" key="PerfRecordArgsId">-e cpu-cycles --call-graph dwarf,4096 -F 250</value>
     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName"></value>
     <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">ProjectExplorer.CustomExecutableRunConfiguration</value>
     <value type="QString" key="ProjectExplorer.RunConfiguration.BuildKey"></value>
     <value type="bool" key="ProjectExplorer.RunConfiguration.Customized">false</value>
+    <value type="QString" key="ProjectExplorer.RunConfiguration.UniqueId"></value>
     <value type="bool" key="RunConfiguration.UseCppDebuggerAuto">true</value>
     <value type="bool" key="RunConfiguration.UseQmlDebuggerAuto">true</value>
+    <value type="QString" key="RunConfiguration.WorkingDirectory.default">%{RunConfig:Executable:Path}</value>
    </valuemap>
    <value type="qlonglong" key="ProjectExplorer.Target.RunConfigurationCount">1</value>
   </valuemap>
@@ -255,10 +291,6 @@
   <variable>ProjectExplorer.Project.TargetCount</variable>
   <value type="qlonglong">1</value>
  </data>
- <data>
-  <variable>ProjectExplorer.Project.Updater.FileVersion</variable>
-  <value type="int">22</value>
- </data>
  <data>
   <variable>Version</variable>
   <value type="int">22</value>
diff --git a/Source/doc/openHPSDR Ethernet Protocol v4.3.docx b/Source/doc/openHPSDR Ethernet Protocol v4.3.docx
new file mode 100644
index 0000000..7dba40c
Binary files /dev/null and b/Source/doc/openHPSDR Ethernet Protocol v4.3.docx differ
diff --git a/Source/src/DataEngine/cusdr_dataEngine.cpp b/Source/src/DataEngine/cusdr_dataEngine.cpp
index 3ab684c..bc38049 100644
--- a/Source/src/DataEngine/cusdr_dataEngine.cpp
+++ b/Source/src/DataEngine/cusdr_dataEngine.cpp
@@ -88,6 +88,7 @@ DataEngine::DataEngine(QObject *parent)
 	, m_hpsdrDevices(0)
 	, m_configure(10)
 	, m_timeout(5000)
+	, m_discoveryProtocol(1)
 	, m_remainingTime(0)
 	, m_RxFrequencyChange(0)
 	, m_forwardPower(0)
@@ -459,33 +460,32 @@ bool DataEngine::startDataEngineWithoutConnection() {
 
 bool DataEngine::findHPSDRDevices() {
 
-	if (!m_discoverer) createDiscoverer();
+	for (int protocolVersion = 1; protocolVersion <= 2; ++protocolVersion) {
 
-	// HPSDR network IO thread
-	if (!startDiscoverer(QThread::NormalPriority)) {
+		m_discoveryProtocol = protocolVersion;
+
+		if (!m_discoverer)
+			createDiscoverer();
+
+		if (!startDiscoverer(QThread::NormalPriority)) {
+
+			io.networkIOMutex.lock();
+			DATA_ENGINE_DEBUG << "HPSDR device discovery thread could not be started.";
+			io.networkIOMutex.unlock();
+			return false;
+		}
 
 		io.networkIOMutex.lock();
-		DATA_ENGINE_DEBUG << "HPSDR device discovery thread could not be started.";
-		io.networkIOMutex.unlock();
-		return false;
-	}
-
-	io.networkIOMutex.lock();
-	DATA_ENGINE_DEBUG << "HPSDR network device detection...please wait.";
-	set->setSystemMessage("HPSDR network device detection...please wait", 0);
-	io.devicefound.wait(&io.networkIOMutex);
-
-	m_hpsdrDevices = set->getHpsdrNetworkDevices();
-	if (m_hpsdrDevices == 0) {
+		DATA_ENGINE_DEBUG << "HPSDR network device detection...please wait.";
+		set->setSystemMessage("HPSDR network device detection...please wait", 0);
+		io.devicefound.wait(&io.networkIOMutex);
 
+		m_hpsdrDevices = set->getHpsdrNetworkDevices();
 		io.networkIOMutex.unlock();
 		stopDiscoverer();
-		DATA_ENGINE_DEBUG << "no device found. HPSDR hardware powered? Network connection established?";
-		set->setSystemMessage("no device found. HPSDR hardware powered? Network connection established?", 10000);
 
-		setSystemState(QSDR::HwIOError,	m_hwInterface, m_serverMode, QSDR::DataEngineDown);
-	}
-	else {
+		if (m_hpsdrDevices == 0)
+			continue;
 
 		emit clearSystemMessageEvent();
 		if (m_hpsdrDevices > 1)
@@ -493,31 +493,35 @@ bool DataEngine::findHPSDRDevices() {
 
 		QList<TNetworkDevicecard> metisList = set->getMetisCardsList();
 		DATA_ENGINE_DEBUG << "found " << metisList.count() << " network device(s)";
-				
-		for (int i = 0; i < metisList.count(); i++) {
 
+		for (int i = 0; i < metisList.count(); i++) {
 			DATA_ENGINE_DEBUG 	<< "Device "
 								<< i << " @ "
 								<< qPrintable(metisList.at(i).ip_address.toString())
-								//<< " [" << qPrintable((char *) &metisList.at(i).mac_address) << "]";
-								<< " [" << metisList.at(i).mac_address << "]";
+								<< " [" << metisList.at(i).mac_address << "]"
+								<< " P" << metisList.at(i).protocolVersion;
 		}
 
 		io.hpsdrDeviceIPAddress = set->getCurrentMetisCard().ip_address;
 		io.hpsdrDeviceName = set->getCurrentMetisCard().boardName;
 		DATA_ENGINE_DEBUG << "using HPSDR network device at " << qPrintable(io.hpsdrDeviceIPAddress.toString());
 
-		//Sleep(100);
 		SleeperThread::msleep(100);
 
-		// stop the discovery thread
-		io.networkIOMutex.unlock();
-		stopDiscoverer();
+		if (set->getCurrentMetisCard().protocolVersion >= 2) {
+			io.hermesFW = set->getCurrentMetisCard().firmwareVersion;
+			set->setHermesVersion(io.hermesFW);
+			return true;
+		}
 
-		if (getFirmwareVersions()) return true;
+		if (getFirmwareVersions())
+			return true;
 		return false;
 	}
 
+	DATA_ENGINE_DEBUG << "no device found. HPSDR hardware powered? Network connection established?";
+	set->setSystemMessage("no device found. HPSDR hardware powered? Network connection established?", 10000);
+	setSystemState(QSDR::HwIOError,	m_hwInterface, m_serverMode, QSDR::DataEngineDown);
 	return false;
 }
 
@@ -1434,7 +1438,10 @@ void DataEngine::disconnectDSPSlots() {
 
 void DataEngine::createDiscoverer() {
 
-    m_discoverer = new DiscovererP1(&io);
+	if (m_discoveryProtocol >= 2)
+		m_discoverer = new DiscovererP2(&io);
+	else
+		m_discoverer = new DiscovererP1(&io);
 
 	m_discoveryThread = new QThreadEx();
 	m_discoverer->moveToThread(m_discoveryThread);
diff --git a/Source/src/DataEngine/cusdr_dataEngine.h b/Source/src/DataEngine/cusdr_dataEngine.h
index 55bc981..bf31c0f 100644
--- a/Source/src/DataEngine/cusdr_dataEngine.h
+++ b/Source/src/DataEngine/cusdr_dataEngine.h
@@ -47,9 +47,10 @@
 #include "cusdr_dataIO.h"
 #include "cusdr_receiver.h"
 #include "cusdr_chirpProcessor.h"
-#include "cusdr_audioReceiver.h"
-#include "cusdr_discoverer_P1.h"
-#include "Util/qcircularbuffer.h"
+#include "cusdr_audioReceiver.h"
+#include "cusdr_discoverer_P1.h"
+#include "cusdr_discoverer_P2.h"
+#include "Util/qcircularbuffer.h"
 #include "QtDSP/qtdsp_fft.h"
 #include "QtDSP/qtdsp_filter.h"
 #include "QtDSP/qtdsp_dualModeAverager.h"
@@ -198,7 +199,7 @@ private:
 	AudioEngine*			m_audioEngine;
 	AudioOutProcessor*		m_audioOutProcessor;
 	ChirpProcessor*			m_chirpProcessor;
-    DiscovererP1*				m_discoverer;
+	QObject*				m_discoverer;
 	
 	QThreadEx*				m_discoveryThread;
 	QThreadEx*				m_dataIOThread;
@@ -256,9 +257,10 @@ private:
 	int		m_fwCount;
 	int		m_configure;
 	int		m_timeout;
-	int		m_txFrame;
-	int		m_bytes;
-	int		m_remainingTime;
+	int		m_txFrame;
+	int		m_bytes;
+	int		m_discoveryProtocol;
+	int		m_remainingTime;
 	int		m_found;
 	int		m_RxFrequencyChange;
 	int		m_counter;
diff --git a/Source/src/DataEngine/cusdr_dataIO.cpp b/Source/src/DataEngine/cusdr_dataIO.cpp
index 29119a3..13575cd 100644
--- a/Source/src/DataEngine/cusdr_dataIO.cpp
+++ b/Source/src/DataEngine/cusdr_dataIO.cpp
@@ -27,6 +27,7 @@
 #define LOG_DATAIO
 
 #include "cusdr_dataIO.h"
+#include "cusdr_protocol2_io.h"
 #include "soundout.h"
 
 #if defined(Q_OS_WIN32)
@@ -41,6 +42,7 @@ DataIO::DataIO(THPSDRParameter *ioData)
 	, set(Settings::instance())
 	, io(ioData)
 	, m_dataIOSocketOn(false)
+	, m_protocol2(0)
 	, m_setNetworkDeviceHeader(true)
 	, m_sequence(0)
 	, m_oldSequence(-1)
@@ -56,6 +58,7 @@ DataIO::DataIO(THPSDRParameter *ioData)
 	, m_stopped(false)
 {
 	m_dataIOSocket = 0;
+	m_protocol2 = new Protocol2DataPath(set, io, this);
 
 	m_metisGetDataSignature.resize(3);
 	m_metisGetDataSignature[0] = (char)0xEF;
@@ -119,6 +122,9 @@ void DataIO::stop() {
 		m_stopped = true;
 	io->networkIOMutex.unlock();
 
+	if (m_protocol2 && m_protocol2->isActive())
+		m_protocol2->stop();
+
 	if(m_pSoundCardOut) {
 		SleeperThread::msleep(100);
 		m_pSoundCardOut->Stop();
@@ -128,6 +134,11 @@ void DataIO::stop() {
 
 void DataIO::initDataReceiverSocket() {
 
+	if (m_protocol2 && m_protocol2->isActive()) {
+		m_dataIOSocketOn = m_protocol2->initSockets();
+		return;
+	}
+
 	m_dataIOSocket = new QUdpSocket();
 
 	int newBufferSize;
@@ -230,6 +241,9 @@ void DataIO::initDataReceiverSocket() {
 
 void DataIO::readDeviceData() {
 
+	if (m_protocol2 && m_protocol2->isActive())
+		return;
+
 	while (m_dataIOSocket->hasPendingDatagrams()) {
 
 		QMutexLocker locker(&io->networkIOMutex);
@@ -357,6 +371,11 @@ void DataIO::readData() {
 
 void DataIO::sendInitFramesToNetworkDevice(int rx) {
 
+	if (m_protocol2 && m_protocol2->isActive()) {
+		m_protocol2->sendInitFramesToNetworkDevice(rx);
+		return;
+	}
+
 	QByteArray initDatagram;
 	initDatagram.resize(1032);
 
@@ -446,6 +465,11 @@ void DataIO::sendInitFramesToNetworkDevice(int rx) {
 
 void DataIO::networkDeviceStartStop(char value) {
 
+	if (m_protocol2 && m_protocol2->isActive()) {
+		m_protocol2->networkDeviceStartStop(value);
+		return;
+	}
+
 	TNetworkDevicecard metis = set->getCurrentMetisCard();
 	//QUdpSocket socket;
 
@@ -517,6 +541,9 @@ void DataIO::sendAudio(u_char *buf) {
 
 void DataIO::writeData() {
 
+	if (m_protocol2 && m_protocol2->isActive())
+		return;
+
 	if (m_setNetworkDeviceHeader) {
 
 		m_outDatagram.resize(0);
@@ -561,6 +588,9 @@ void DataIO::setManualSocketBufferSize(QObject *sender, bool value) {
 
 	Q_UNUSED (sender)
 
+	if (m_protocol2 && m_protocol2->isActive())
+		return;
+
 	m_manualBufferSize = value;
 	DATAIO_DEBUG << "m_manualBufferSize to change = " << m_manualBufferSize;
 	int socketBufferSize = 1032 * set->getSocketBufferSize();
@@ -601,6 +631,9 @@ void DataIO::setSocketBufferSize(QObject *sender, int value) {
 
 	Q_UNUSED (sender)
 
+	if (m_protocol2 && m_protocol2->isActive())
+		return;
+
 	int socketBufferSize = value * 1024;
 	DATAIO_DEBUG << "m_socketBufferSize = " << value;
 
@@ -621,6 +654,9 @@ void DataIO::setSampleRate(QObject *sender, int value) {
 
 	Q_UNUSED(sender)
 
+	if (m_protocol2 && m_protocol2->isActive())
+		return;
+
 	int bufferSize;
 	io->networkIOMutex.lock();
 	switch (value) {
diff --git a/Source/src/DataEngine/cusdr_dataIO.h b/Source/src/DataEngine/cusdr_dataIO.h
index 3043799..6851189 100644
--- a/Source/src/DataEngine/cusdr_dataIO.h
+++ b/Source/src/DataEngine/cusdr_dataIO.h
@@ -36,8 +36,8 @@
 //#include <QWaitCondition>
 //#include <QThread>
 
-#include "cusdr_settings.h"
-#include "soundout.h"
+#include "cusdr_settings.h"
+#include "soundout.h"
 
 #ifdef LOG_DATAIO
 #   define DATAIO_DEBUG qDebug().nospace() << "DataIO::\t"
@@ -46,7 +46,7 @@
 #endif
 
 
-class DataIO : public QObject {
+class DataIO : public QObject {
 
     Q_OBJECT
 
@@ -71,10 +71,11 @@ private slots:
 	void setSocketBufferSize(QObject *sender, int value);
 	void readDeviceData();
 	
-private:
-	Settings*		set;
-	QUdpSocket*		m_dataIOSocket;
-	//QMutex			m_mutex;
+private:
+	Settings*		set;
+	QUdpSocket*		m_dataIOSocket;
+	class Protocol2DataPath* m_protocol2;
+	//QMutex			m_mutex;
 	QByteArray		m_commandDatagram;
 	QByteArray		m_datagram;
 	QByteArray		m_wbDatagram;
diff --git a/Source/src/DataEngine/cusdr_discoverer_P1.cpp b/Source/src/DataEngine/cusdr_discoverer_P1.cpp
index 0d077eb..f6a0eb4 100644
--- a/Source/src/DataEngine/cusdr_discoverer_P1.cpp
+++ b/Source/src/DataEngine/cusdr_discoverer_P1.cpp
@@ -226,6 +226,8 @@ int DiscovererP1::findHPSDRDevices() {
 
                 mcP1.boardID = no;
                 mcP1.boardName = str;
+				mcP1.protocolVersion = 1;
+				mcP1.firmwareVersion = m_deviceDatagram.at(9) & 0xFF;
 				io->networkIOMutex.lock();
 				DISCOVERER_DEBUG << "Device board ID: " <<  no;
 				DISCOVERER_DEBUG << "Device is: " << qPrintable(str);
diff --git a/Source/src/DataEngine/cusdr_discoverer_P2.cpp b/Source/src/DataEngine/cusdr_discoverer_P2.cpp
index edfd41e..f46777b 100644
--- a/Source/src/DataEngine/cusdr_discoverer_P2.cpp
+++ b/Source/src/DataEngine/cusdr_discoverer_P2.cpp
@@ -44,6 +44,25 @@ DiscovererP2::~DiscovererP2() {
 
 TNetworkDevicecard mcP2;
 
+namespace {
+
+static QString protocol2BoardName(int boardId) {
+
+	switch (boardId) {
+		case 0: return "ATLAS";
+		case 1: return "Hermes";
+		case 2: return "Hermes";
+		case 3: return "Angelia";
+		case 4: return "Orion";
+		case 5: return "Orion MkII";
+		case 6: return "Hermes-Lite";
+		case 10: return "Saturn";
+		default: return QString("Protocol2-%1").arg(boardId);
+	}
+}
+
+}
+
 void DiscovererP2::initHPSDRDevice() {
 
 	m_searchTime.start();
@@ -185,7 +204,11 @@ int DiscovererP2::findHPSDRDevices() {
 		m_deviceDatagram.resize(socket.pendingDatagramSize());
         socket.readDatagram(m_deviceDatagram.data(), m_deviceDatagram.size(), &mcP2.ip_address, &port);
 
-        if (m_deviceDatagram[0] == (char)0 && m_deviceDatagram[1] == (char)0 && m_deviceDatagram[2] == (char)0 && m_deviceDatagram[3] == (char)0) {
+        if (m_deviceDatagram.size() >= 14 &&
+			m_deviceDatagram[0] == (char)0 &&
+			m_deviceDatagram[1] == (char)0 &&
+			m_deviceDatagram[2] == (char)0 &&
+			m_deviceDatagram[3] == (char)0) {
             status = m_deviceDatagram[4] & 0xFF;
 			
             if (status == 2 || status == 3) {
@@ -196,29 +219,16 @@ int DiscovererP2::findHPSDRDevices() {
 				
 				io->networkIOMutex.lock();
                 DISCOVERER_DEBUG << "Device on protocol 2 found at " << qPrintable(mcP2.ip_address.toString()) << ":" << port << "; Mac addr: [" << mcP2.mac_address << "]";
-                DISCOVERER_DEBUG << "Device protocol 2 code version: " << qPrintable(QString::number(m_deviceDatagram[13], 10));
+                DISCOVERER_DEBUG << "Device protocol 2 code version: " << qPrintable(QString::number(m_deviceDatagram[13] & 0xFF, 10));
 				io->networkIOMutex.unlock();
 
                 device = m_deviceDatagram[11] & 0xFF;
-				QString str;
-                if (device == 0)
-                    str = "ATLAS";
-                else if (device == 1)
-                    str = "HERMES_ANAN-10_100)";
-                else if (device == 2)
-                    str = "HERMES_ANAN_10E_100B)";
-                else if (device == 3)
-                    str = "ANGELA_ANAN_100D)";
-                else if (device == 4)
-                    str = "ORION_ANAN_200D)";
-                else if (device == 5)
-                    str = "ORION_Mk_II_ANAN-7_8000DLE)";
-                else if (device == 6) {
-					str = "Hermes-Lite";
-				}
+				QString str = protocol2BoardName(device);
 
                 mcP2.boardID = device;
                 mcP2.boardName = str;
+				mcP2.protocolVersion = m_deviceDatagram[12] & 0xFF;
+				mcP2.firmwareVersion = m_deviceDatagram[13] & 0xFF;
 				io->networkIOMutex.lock();
                 DISCOVERER_DEBUG << "Protocol 2 device board ID: " <<  device;
                 DISCOVERER_DEBUG << "Protocol 2 device is: " << qPrintable(str);
@@ -274,20 +284,11 @@ void DiscovererP2::clear() {
 
 void DiscovererP2::shutdownHPSDRDevice() {
 
-    long sequence = 0;
-    QByteArray arr;
-    arr.resize(1444);
-
-    arr[0] = sequence >> 24;
-    arr[1] = sequence >> 16;
-    arr[2] = sequence >> 8;
-    arr[3] = sequence;
-    arr[4] = 0;
+	QByteArray arr(1444, 0x00);
 
 	QUdpSocket socket;
     QHostAddress addr = mcP2.ip_address;
 
-        if (socket.writeDatagram(arr, addr, HIGH_PRIORITY_FROM_HOST_PORT) < 0) {
-            DISCOVERER_DEBUG << "protocol 2 forced shutdown socket write failed.";
-		}
+	if (socket.writeDatagram(arr, addr, HIGH_PRIORITY_FROM_HOST_PORT) < 0)
+		DISCOVERER_DEBUG << "protocol 2 forced shutdown socket write failed.";
 }
diff --git a/Source/src/DataEngine/cusdr_protocol2_io.cpp b/Source/src/DataEngine/cusdr_protocol2_io.cpp
new file mode 100644
index 0000000..59f616d
--- /dev/null
+++ b/Source/src/DataEngine/cusdr_protocol2_io.cpp
@@ -0,0 +1,439 @@
+/**
+* @file  cusdr_protocol2_io.cpp
+* @brief openHPSDR Protocol 2 transport helper
+*/
+
+#define LOG_DATAIO
+
+#include "cusdr_protocol2_io.h"
+
+#ifdef LOG_DATAIO
+#   define PROTOCOL2_DEBUG qDebug().nospace() << "Protocol2::\t"
+#else
+#   define PROTOCOL2_DEBUG nullDebug()
+#endif
+
+
+namespace {
+
+static const quint16 kProtocol2DdcSpecificPort = 1025;
+static const quint16 kProtocol2HighPriorityToPcPort = 1025;
+static const quint16 kProtocol2DdcAudioPort = 1028;
+static const quint16 kProtocol2DucIqPort = 1029;
+static const quint16 kProtocol2DdcBasePort = 1035;
+static const int kProtocol2GeneralPacketSize = 60;
+static const int kProtocol2HighPriorityPacketSize = 1444;
+static const int kProtocol2StatusPacketMinSize = 31;
+
+}
+
+
+Protocol2DataPath::Protocol2DataPath(Settings *settings, THPSDRParameter *ioData, QObject *parent)
+	: QObject(parent)
+	, set(settings)
+	, io(ioData)
+	, m_commandSocket(0)
+	, m_statusSocket(0)
+	, m_heartbeatTimer(0)
+	, m_running(false)
+	, m_generalSequence(0)
+	, m_ddcSequence(0)
+	, m_highPrioritySequence(0)
+{
+	m_legacyControlBytes = QByteArray(5, 0x00);
+}
+
+Protocol2DataPath::~Protocol2DataPath() {
+	stop();
+}
+
+bool Protocol2DataPath::isActive() const {
+	return set->getCurrentMetisCard().protocolVersion >= 2;
+}
+
+bool Protocol2DataPath::initSockets() {
+
+	if (!isActive())
+		return false;
+
+	closeSockets();
+
+	const QHostAddress localAddress(set->getHPSDRDeviceLocalAddr());
+	const quint16 discoveryPort = set->getMetisPort();
+	const int receivers = qMax(1, set->getNumberOfReceivers());
+
+	m_commandSocket = new QUdpSocket(this);
+	if (!m_commandSocket->bind(localAddress, discoveryPort, QUdpSocket::DontShareAddress)) {
+		PROTOCOL2_DEBUG << "command socket bind failed on port " << discoveryPort;
+		closeSockets();
+		return false;
+	}
+
+	m_statusSocket = new QUdpSocket(this);
+	if (!m_statusSocket->bind(localAddress, kProtocol2HighPriorityToPcPort, QUdpSocket::DontShareAddress)) {
+		PROTOCOL2_DEBUG << "status socket bind failed on port " << kProtocol2HighPriorityToPcPort;
+		closeSockets();
+		return false;
+	}
+	CHECKED_CONNECT(
+		m_statusSocket,
+		SIGNAL(readyRead()),
+		this,
+		SLOT(readStatusData()));
+
+	m_ddcSampleBuffers.clear();
+	m_ddcSockets.clear();
+	for (int rx = 0; rx < receivers; ++rx) {
+
+		QUdpSocket *socket = new QUdpSocket(this);
+		const quint16 port = kProtocol2DdcBasePort + rx;
+		if (!socket->bind(localAddress, port, QUdpSocket::DontShareAddress)) {
+			PROTOCOL2_DEBUG << "DDC socket bind failed on port " << port;
+			delete socket;
+			closeSockets();
+			return false;
+		}
+
+		CHECKED_CONNECT(
+			socket,
+			SIGNAL(readyRead()),
+			this,
+			SLOT(readDdcData()));
+
+		m_ddcSockets.append(socket);
+		m_ddcSampleBuffers.append(QList<Protocol2IQSample>());
+	}
+
+	m_heartbeatTimer = new QTimer(this);
+	m_heartbeatTimer->setInterval(100);
+	CHECKED_CONNECT(
+		m_heartbeatTimer,
+		SIGNAL(timeout()),
+		this,
+		SLOT(sendHeartbeat()));
+
+	m_partialLegacyFrame.clear();
+	m_partialLegacyFrame.reserve(BUFFER_SIZE);
+	m_legacyControlBytes.fill(0x00, 5);
+	m_running = false;
+
+	PROTOCOL2_DEBUG << "sockets initialized for " << receivers << " receiver(s).";
+	return true;
+}
+
+void Protocol2DataPath::stop() {
+
+	m_running = false;
+
+	if (m_heartbeatTimer)
+		m_heartbeatTimer->stop();
+
+	if (m_commandSocket)
+		sendHighPriorityPacket(false);
+
+	closeSockets();
+}
+
+void Protocol2DataPath::sendInitFramesToNetworkDevice(int rx) {
+	Q_UNUSED(rx)
+}
+
+void Protocol2DataPath::networkDeviceStartStop(char value) {
+
+	if (!m_commandSocket)
+		return;
+
+	if (value == 0) {
+		m_running = false;
+		if (m_heartbeatTimer)
+			m_heartbeatTimer->stop();
+		sendHighPriorityPacket(false);
+		return;
+	}
+
+	sendGeneralPacket();
+	sendDdcSpecificPacket();
+	sendHighPriorityPacket(true);
+
+	m_running = true;
+	if (m_heartbeatTimer)
+		m_heartbeatTimer->start();
+}
+
+void Protocol2DataPath::readStatusData() {
+
+	while (m_statusSocket && m_statusSocket->hasPendingDatagrams()) {
+
+		m_statusDatagram.resize(m_statusSocket->pendingDatagramSize());
+		m_statusSocket->readDatagram(m_statusDatagram.data(), m_statusDatagram.size());
+
+		if (m_statusDatagram.size() >= kProtocol2StatusPacketMinSize)
+			updateLegacyControlBytes(m_statusDatagram);
+	}
+}
+
+void Protocol2DataPath::readDdcData() {
+
+	QUdpSocket *socket = qobject_cast<QUdpSocket *>(sender());
+	const int rx = m_ddcSockets.indexOf(socket);
+
+	if (rx < 0)
+		return;
+
+	while (socket->hasPendingDatagrams()) {
+
+		QByteArray datagram;
+		datagram.resize(socket->pendingDatagramSize());
+		socket->readDatagram(datagram.data(), datagram.size());
+
+		if (datagram.size() < 16)
+			continue;
+
+		const int bitsPerSample = ((quint8)datagram.at(12) << 8) | (quint8)datagram.at(13);
+		const int sampleCount = ((quint8)datagram.at(14) << 8) | (quint8)datagram.at(15);
+		const int payloadBytes = 16 + sampleCount * 6;
+
+		if (bitsPerSample != 24 || datagram.size() < payloadBytes)
+			continue;
+
+		for (int i = 0; i < sampleCount; ++i) {
+
+			const char *sample = datagram.constData() + 16 + i * 6;
+			Protocol2IQSample iqSample;
+			iqSample.i = read24BitSample(sample);
+			iqSample.q = read24BitSample(sample + 3);
+			m_ddcSampleBuffers[rx].append(iqSample);
+		}
+	}
+
+	tryProduceLegacyFrames();
+}
+
+void Protocol2DataPath::sendHeartbeat() {
+
+	if (!m_running)
+		return;
+
+	sendHighPriorityPacket(true);
+}
+
+void Protocol2DataPath::closeSockets() {
+
+	if (m_heartbeatTimer) {
+		delete m_heartbeatTimer;
+		m_heartbeatTimer = 0;
+	}
+
+	foreach (QUdpSocket *socket, m_ddcSockets) {
+		socket->close();
+		delete socket;
+	}
+	m_ddcSockets.clear();
+	m_ddcSampleBuffers.clear();
+
+	if (m_statusSocket) {
+		m_statusSocket->close();
+		delete m_statusSocket;
+		m_statusSocket = 0;
+	}
+
+	if (m_commandSocket) {
+		m_commandSocket->close();
+		delete m_commandSocket;
+		m_commandSocket = 0;
+	}
+
+	m_partialLegacyFrame.clear();
+}
+
+void Protocol2DataPath::sendGeneralPacket() {
+
+	QByteArray datagram(kProtocol2GeneralPacketSize, 0x00);
+
+	datagram[0] = (m_generalSequence >> 24) & 0xFF;
+	datagram[1] = (m_generalSequence >> 16) & 0xFF;
+	datagram[2] = (m_generalSequence >> 8) & 0xFF;
+	datagram[3] = m_generalSequence & 0xFF;
+	datagram[4] = 0x00;
+	datagram[5] = (kProtocol2DdcSpecificPort >> 8) & 0xFF;
+	datagram[6] = kProtocol2DdcSpecificPort & 0xFF;
+	datagram[7] = (kProtocol2DucIqPort >> 8) & 0xFF;
+	datagram[8] = kProtocol2DucIqPort & 0xFF;
+	datagram[9] = (HIGH_PRIORITY_FROM_HOST_PORT >> 8) & 0xFF;
+	datagram[10] = HIGH_PRIORITY_FROM_HOST_PORT & 0xFF;
+	datagram[11] = (kProtocol2HighPriorityToPcPort >> 8) & 0xFF;
+	datagram[12] = kProtocol2HighPriorityToPcPort & 0xFF;
+	datagram[13] = (kProtocol2DdcAudioPort >> 8) & 0xFF;
+	datagram[14] = kProtocol2DdcAudioPort & 0xFF;
+	datagram[15] = (kProtocol2DucIqPort >> 8) & 0xFF;
+	datagram[16] = kProtocol2DucIqPort & 0xFF;
+	datagram[17] = (kProtocol2DdcBasePort >> 8) & 0xFF;
+	datagram[18] = kProtocol2DdcBasePort & 0xFF;
+	datagram[21] = (HIGH_PRIORITY_FROM_HOST_PORT >> 8) & 0xFF;
+	datagram[22] = HIGH_PRIORITY_FROM_HOST_PORT & 0xFF;
+	datagram[24] = 0x02;
+	datagram[26] = 0x10;
+	datagram[27] = 20;
+	datagram[28] = 32;
+
+	if (m_commandSocket->writeDatagram(datagram, set->getCurrentMetisCard().ip_address, DEVICE_PORT) >= 0)
+		++m_generalSequence;
+	else
+		PROTOCOL2_DEBUG << "general packet write failed.";
+}
+
+void Protocol2DataPath::sendDdcSpecificPacket() {
+
+	const int receivers = qMax(1, set->getNumberOfReceivers());
+	QByteArray datagram(17 + receivers * 6, 0x00);
+
+	datagram[0] = (m_ddcSequence >> 24) & 0xFF;
+	datagram[1] = (m_ddcSequence >> 16) & 0xFF;
+	datagram[2] = (m_ddcSequence >> 8) & 0xFF;
+	datagram[3] = m_ddcSequence & 0xFF;
+	datagram[4] = 0x01;
+	datagram[5] = io->ccTx.dither ? 0x01 : 0x00;
+	datagram[6] = io->ccTx.random ? 0x01 : 0x00;
+
+	for (int rx = 0; rx < receivers; ++rx) {
+
+		datagram[7 + rx / 8] = datagram.at(7 + rx / 8) | (1 << (rx % 8));
+
+		const int offset = 17 + rx * 6;
+		datagram[offset + 0] = 0x00;
+		datagram[offset + 1] = (io->samplerate >> 8) & 0xFF;
+		datagram[offset + 2] = io->samplerate & 0xFF;
+		datagram[offset + 3] = 0x00;
+		datagram[offset + 4] = 0x00;
+		datagram[offset + 5] = 24;
+	}
+
+	if (m_commandSocket->writeDatagram(datagram, set->getCurrentMetisCard().ip_address, kProtocol2DdcSpecificPort) >= 0)
+		++m_ddcSequence;
+	else
+		PROTOCOL2_DEBUG << "DDC specific packet write failed.";
+}
+
+void Protocol2DataPath::sendHighPriorityPacket(bool run) {
+
+	QByteArray datagram(kProtocol2HighPriorityPacketSize, 0x00);
+	const QList<long> frequencies = set->getCtrFrequencies();
+	const int receivers = qMax(1, set->getNumberOfReceivers());
+
+	datagram[0] = (m_highPrioritySequence >> 24) & 0xFF;
+	datagram[1] = (m_highPrioritySequence >> 16) & 0xFF;
+	datagram[2] = (m_highPrioritySequence >> 8) & 0xFF;
+	datagram[3] = m_highPrioritySequence & 0xFF;
+	datagram[4] = run ? 0x01 : 0x00;
+
+	for (int rx = 0; rx < receivers; ++rx) {
+
+		const quint32 encodedFrequency = encodeFrequency(frequencies.value(rx, frequencies.value(0, 0)));
+		const int offset = 9 + rx * 4;
+
+		datagram[offset + 0] = (encodedFrequency >> 24) & 0xFF;
+		datagram[offset + 1] = (encodedFrequency >> 16) & 0xFF;
+		datagram[offset + 2] = (encodedFrequency >> 8) & 0xFF;
+		datagram[offset + 3] = encodedFrequency & 0xFF;
+	}
+
+	if (m_commandSocket->writeDatagram(datagram, set->getCurrentMetisCard().ip_address, HIGH_PRIORITY_FROM_HOST_PORT) >= 0)
+		++m_highPrioritySequence;
+	else
+		PROTOCOL2_DEBUG << "high priority packet write failed.";
+}
+
+void Protocol2DataPath::updateLegacyControlBytes(const QByteArray &statusDatagram) {
+
+	const uchar statusBits = (uchar)statusDatagram.at(4);
+	const uchar overloadBits = (uchar)statusDatagram.at(5);
+
+	char control0 = 0x00;
+	if (statusBits & 0x01) control0 |= 0x01;
+	if (statusBits & 0x04) control0 |= 0x02;
+	if (statusBits & 0x02) control0 |= 0x04;
+
+	m_legacyControlBytes[0] = control0;
+	m_legacyControlBytes[1] = (overloadBits & 0x01) ? 0x01 : 0x00;
+	m_legacyControlBytes[2] = 0x00;
+	m_legacyControlBytes[3] = 0x00;
+	m_legacyControlBytes[4] = (char)(set->getCurrentMetisCard().firmwareVersion & 0xFF);
+}
+
+void Protocol2DataPath::tryProduceLegacyFrames() {
+
+	const int receivers = qMax(1, set->getNumberOfReceivers());
+	const int halfFrameSamples = samplesPerLegacyHalfFrame();
+
+	if (halfFrameSamples <= 0)
+		return;
+
+	while (true) {
+
+		bool hasEnoughData = true;
+		for (int rx = 0; rx < receivers; ++rx) {
+			if (rx >= m_ddcSampleBuffers.size() || m_ddcSampleBuffers[rx].size() < halfFrameSamples) {
+				hasEnoughData = false;
+				break;
+			}
+		}
+
+		if (!hasEnoughData)
+			break;
+
+		QByteArray halfFrame(BUFFER_SIZE / 2, 0x00);
+		int pos = 0;
+		halfFrame[pos++] = SYNC;
+		halfFrame[pos++] = SYNC;
+		halfFrame[pos++] = SYNC;
+		for (int i = 0; i < m_legacyControlBytes.size(); ++i)
+			halfFrame[pos++] = m_legacyControlBytes.at(i);
+
+		for (int sampleIndex = 0; sampleIndex < halfFrameSamples; ++sampleIndex) {
+			for (int rx = 0; rx < receivers; ++rx) {
+
+				const Protocol2IQSample sample = m_ddcSampleBuffers[rx].takeFirst();
+				halfFrame[pos++] = (sample.i >> 16) & 0xFF;
+				halfFrame[pos++] = (sample.i >> 8) & 0xFF;
+				halfFrame[pos++] = sample.i & 0xFF;
+				halfFrame[pos++] = (sample.q >> 16) & 0xFF;
+				halfFrame[pos++] = (sample.q >> 8) & 0xFF;
+				halfFrame[pos++] = sample.q & 0xFF;
+			}
+
+			halfFrame[pos++] = 0x00;
+			halfFrame[pos++] = 0x00;
+		}
+
+		m_partialLegacyFrame += halfFrame;
+		if (m_partialLegacyFrame.size() == BUFFER_SIZE) {
+			if (!io->iq_queue.isFull())
+				io->iq_queue.enqueue(m_partialLegacyFrame);
+			m_partialLegacyFrame.clear();
+		}
+	}
+}
+
+int Protocol2DataPath::samplesPerLegacyHalfFrame() const {
+
+	const int receivers = qMax(1, set->getNumberOfReceivers());
+	const int bytesPerSample = receivers * 6 + 2;
+
+	return (BUFFER_SIZE / 2 - 8) / bytesPerSample;
+}
+
+quint32 Protocol2DataPath::encodeFrequency(long frequency) const {
+	return (quint32)frequency;
+}
+
+qint32 Protocol2DataPath::read24BitSample(const char *data) const {
+
+	qint32 value = ((qint32)(quint8)data[0] << 16) |
+				   ((qint32)(quint8)data[1] << 8) |
+				   (qint32)(quint8)data[2];
+
+	if (value & 0x00800000)
+		value |= 0xFF000000;
+
+	return value;
+}
diff --git a/Source/src/DataEngine/cusdr_protocol2_io.h b/Source/src/DataEngine/cusdr_protocol2_io.h
new file mode 100644
index 0000000..0c38f1b
--- /dev/null
+++ b/Source/src/DataEngine/cusdr_protocol2_io.h
@@ -0,0 +1,67 @@
+/**
+* @file  cusdr_protocol2_io.h
+* @brief openHPSDR Protocol 2 transport helper
+*/
+
+#ifndef _CUSDR_PROTOCOL2_IO_H
+#define _CUSDR_PROTOCOL2_IO_H
+
+#include "cusdr_settings.h"
+
+#include <QList>
+#include <QTimer>
+#include <QUdpSocket>
+
+struct Protocol2IQSample {
+	qint32 i;
+	qint32 q;
+};
+
+class Protocol2DataPath : public QObject {
+
+	Q_OBJECT
+
+public:
+	Protocol2DataPath(Settings *settings, THPSDRParameter *ioData, QObject *parent = 0);
+	~Protocol2DataPath();
+
+	bool	isActive() const;
+	bool	initSockets();
+	void	stop();
+	void	sendInitFramesToNetworkDevice(int rx);
+	void	networkDeviceStartStop(char value);
+
+private slots:
+	void	readStatusData();
+	void	readDdcData();
+	void	sendHeartbeat();
+
+private:
+	void	closeSockets();
+	void	sendGeneralPacket();
+	void	sendDdcSpecificPacket();
+	void	sendHighPriorityPacket(bool run);
+	void	updateLegacyControlBytes(const QByteArray &statusDatagram);
+	void	tryProduceLegacyFrames();
+	int		samplesPerLegacyHalfFrame() const;
+	quint32 encodeFrequency(long frequency) const;
+	qint32 read24BitSample(const char *data) const;
+
+private:
+	Settings*						set;
+	THPSDRParameter*				io;
+	QUdpSocket*						m_commandSocket;
+	QUdpSocket*						m_statusSocket;
+	QList<QUdpSocket*>				m_ddcSockets;
+	QList<QList<Protocol2IQSample> >	m_ddcSampleBuffers;
+	QTimer*							m_heartbeatTimer;
+	QByteArray						m_partialLegacyFrame;
+	QByteArray						m_statusDatagram;
+	QByteArray						m_legacyControlBytes;
+	bool							m_running;
+	quint32							m_generalSequence;
+	quint32							m_ddcSequence;
+	quint32							m_highPrioritySequence;
+};
+
+#endif // _CUSDR_PROTOCOL2_IO_H
diff --git a/Source/src/cusdr_settings.h b/Source/src/cusdr_settings.h
index 4ade040..f1a1772 100644
--- a/Source/src/cusdr_settings.h
+++ b/Source/src/cusdr_settings.h
@@ -483,6 +483,8 @@ typedef struct _networkDeviceCard {
 	char			mac_address[18];
 	int				boardID;
 	QString			boardName;
+	int				protocolVersion;
+	int				firmwareVersion;
 
 } TNetworkDevicecard;