diff --git a/osal/CMakeLists.txt b/osal/CMakeLists.txt
new file mode 100644
index 00000000..02ff2405
--- /dev/null
+++ b/osal/CMakeLists.txt
@@ -0,0 +1,34 @@
+# Check the OS_FSFW variable
+if(${OS_FSFW} STREQUAL "freertos")
+	add_subdirectory(FreeRTOS)
+elseif(${OS_FSFW} STREQUAL "rtems")
+	add_subdirectory(rtems)
+elseif(${OS_FSFW} STREQUAL "linux")
+	add_subdirectory(linux)
+elseif(${OS_FSFW} STREQUAL "host")
+	add_subdirectory(host)
+	if (WIN32)
+		add_subdirectory(windows)
+	elseif(UNIX)
+		target_sources(${LIB_FSFW_NAME}
+			PUBLIC
+				linux/TcUnixUdpPollingTask.cpp
+				linux/TmTcUnixUdpBridge.cpp
+		)
+	endif ()
+
+else()
+
+	message(WARNING "The OS_FSFW variable was not set. Assuming host OS..")
+	# Not set. Assumuing this is a host build, try to determine host OS
+	if (WIN32)
+		add_subdirectory(host)
+		add_subdirectory(windows)
+	elseif (UNIX)
+		add_subdirectory(linux)
+	else ()
+		# MacOS or other OSes have not been tested yet / are not supported.
+		message(FATAL_ERROR "The host OS could not be determined! Aborting.")
+	endif()
+
+endif()
\ No newline at end of file
diff --git a/osal/FreeRTOS/CMakeLists.txt b/osal/FreeRTOS/CMakeLists.txt
new file mode 100644
index 00000000..95462010
--- /dev/null
+++ b/osal/FreeRTOS/CMakeLists.txt
@@ -0,0 +1,30 @@
+target_sources(${LIB_FSFW_NAME} 
+	PRIVATE 
+		Clock.cpp
+		FixedTimeslotTask.cpp
+		BinarySemaphore.cpp
+		BinSemaphUsingTask.cpp
+		CountingSemaphore.cpp
+		CountingSemaphUsingTask.cpp
+		MessageQueue.cpp
+		Mutex.cpp
+		MutexFactory.cpp
+		PeriodicTask.cpp
+		QueueFactory.cpp
+		SemaphoreFactory.cpp
+		TaskFactory.cpp
+		Timekeeper.cpp
+		TaskManagement.cpp
+)
+
+# FreeRTOS is required to link the FSFW now. It is recommended to compile 
+# FreeRTOS as a static library and set LIB_OS_NAME to the target name of the 
+# library.
+if(NOT LIB_OS_NAME)
+	message(FATAL_ERROR 
+		"FreeRTOS needs to be linked as a target and "
+		"LIB_OS_NAME needs to be set to the target"
+	)
+endif()
+
+target_link_libraries(${LIB_FSWFW_NAME} ${LIB_OS_NAME})
\ No newline at end of file
diff --git a/osal/host/CMakeLists.txt b/osal/host/CMakeLists.txt
new file mode 100644
index 00000000..aa32990b
--- /dev/null
+++ b/osal/host/CMakeLists.txt
@@ -0,0 +1,21 @@
+target_sources(${LIB_FSFW_NAME} 
+	PRIVATE 
+		Clock.cpp
+		FixedTimeslotTask.cpp
+		MessageQueue.cpp
+		Mutex.cpp
+		MutexFactory.cpp
+		PeriodicTask.cpp
+		QueueFactory.cpp
+		QueueMapManager.cpp
+		SemaphoreFactory.cpp
+		TaskFactory.cpp
+)
+
+if(UNIX)
+	target_link_libraries(${LIB_FSFW_NAME} 
+	PRIVATE
+		rt
+		pthread
+	)
+endif()
\ No newline at end of file
diff --git a/osal/windows/CMakeLists.txt b/osal/windows/CMakeLists.txt
new file mode 100644
index 00000000..b6e76d6a
--- /dev/null
+++ b/osal/windows/CMakeLists.txt
@@ -0,0 +1,11 @@
+target_sources(${LIB_FSFW_NAME} 
+	PRIVATE 
+		TcWinUdpPollingTask.cpp
+		TmTcWinUdpBridge.cpp
+)
+
+target_link_libraries(${LIB_FSFW_NAME} 
+	PRIVATE
+		wsock32 
+		ws2_32
+)
\ No newline at end of file
diff --git a/osal/windows/TmTcWinUdpBridge.cpp b/osal/windows/TmTcWinUdpBridge.cpp
index 2af3daa5..e1ba132e 100644
--- a/osal/windows/TmTcWinUdpBridge.cpp
+++ b/osal/windows/TmTcWinUdpBridge.cpp
@@ -6,6 +6,7 @@ TmTcWinUdpBridge::TmTcWinUdpBridge(object_id_t objectId,
         uint16_t serverPort, uint16_t clientPort):
         TmTcBridge(objectId, tcDestination, tmStoreId, tcStoreId) {
     mutex = MutexFactory::instance()->createMutex();
+    communicationLinkUp = false;
 
     // Initiates Winsock DLL.
     WSAData wsaData;
@@ -90,7 +91,6 @@ ReturnValue_t TmTcWinUdpBridge::sendTm(const uint8_t *data, size_t dataLen) {
 //  sif::debug << "TmTcUnixUdpBridge::sendTm: " << bytesSent << " bytes were"
 //          " sent." << std::endl;
     return HasReturnvaluesIF::RETURN_OK;
-    return HasReturnvaluesIF::RETURN_OK;
 }
 
 void TmTcWinUdpBridge::checkAndSetClientAddress(sockaddr_in newAddress) {
@@ -101,6 +101,7 @@ void TmTcWinUdpBridge::checkAndSetClientAddress(sockaddr_in newAddress) {
 //          &newAddress.sin_addr.s_addr, ipAddress, 15) << std::endl;
 //  sif::debug << "IP Address Old: " <<  inet_ntop(AF_INET,
 //          &clientAddress.sin_addr.s_addr, ipAddress, 15) << std::endl;
+    registerCommConnect();
 
     // Set new IP address if it has changed.
     if(clientAddress.sin_addr.s_addr != newAddress.sin_addr.s_addr) {
@@ -114,7 +115,7 @@ void TmTcWinUdpBridge::handleSocketError() {
     switch(errCode) {
     case(WSANOTINITIALISED): {
         sif::info << "TmTcWinUdpBridge::handleSocketError: WSANOTINITIALISED: "
-                << "WSAStartup(...) call " << "necessary" << std::endl;
+                << "WSAStartup(...) call necessary" << std::endl;
         break;
     }
     default: {
@@ -159,11 +160,11 @@ void TmTcWinUdpBridge::handleSendError() {
     switch(errCode) {
     case(WSANOTINITIALISED): {
         sif::info << "TmTcWinUdpBridge::handleSendError: WSANOTINITIALISED: "
-                << "WSAStartup(...) call " << "necessary" << std::endl;
+                << "WSAStartup(...) call necessary" << std::endl;
         break;
     }
     case(WSAEADDRNOTAVAIL): {
-        sif::info << "TmTcWinUdpBridge::handleReadError: WSAEADDRNOTAVAIL: "
+        sif::info << "TmTcWinUdpBridge::handleSendError: WSAEADDRNOTAVAIL: "
                 << "Check target address. " << std::endl;
         break;
     }