--- a/src/CMakeLists.txt	Fri Mar 04 01:11:27 2022 +0100
+++ b/src/CMakeLists.txt	Fri Mar 04 01:40:50 2022 +0100
@@ -34,7 +34,7 @@
 )
 
 # Link libraries:
-target_link_libraries(${EXECUTABLE_FILE} ${RELPIPE_LIBS_LIBRARIES})
+target_link_libraries(${EXECUTABLE_FILE} ${RELPIPE_LIBS_LIBRARIES} rt)
 set_property(TARGET ${EXECUTABLE_FILE} PROPERTY INSTALL_RPATH_USE_LINK_PATH TRUE)
 
 install(TARGETS ${EXECUTABLE_FILE} DESTINATION bin)

--- a/src/PosixMQ.h	Fri Mar 04 01:11:27 2022 +0100
+++ b/src/PosixMQ.h	Fri Mar 04 01:40:50 2022 +0100
@@ -22,7 +22,7 @@
 #include <cstring>
 
 namespace relpipe {
-namespace in {
+namespace out {
 namespace posixmq {
 
 class PosixMQ {
@@ -41,11 +41,16 @@
 	}
 
 	static PosixMQ* open(std::string queueName) {
-		mqd_t handle = mq_open(queueName.c_str(), O_RDONLY | O_CREAT);
+		mqd_t handle = mq_open(queueName.c_str(), O_RDWR | O_CREAT);
 		if (handle >= 0) return new PosixMQ(queueName, handle);
 		else throw std::logic_error("Unable to open PosixMQ: " + queueName + " error: " + strerror(errno));
 	}
 
+	void send(std::string message) {
+		int result = mq_send(handle, message.c_str(), message.size(), 0);
+		if (result) throw std::logic_error("mq_send() = " + std::to_string(result) + " error: " + strerror(errno));
+	}
+
 	std::string receive() {
 		char buffer[MSG_SIZE + 1];
 		memset(buffer, 0, MSG_SIZE + 1);

--- a/src/PosixMQHandler.h	Fri Mar 04 01:11:27 2022 +0100
+++ b/src/PosixMQHandler.h	Fri Mar 04 01:40:50 2022 +0100
@@ -29,28 +29,36 @@
 #include <relpipe/reader/handlers/RelationalReaderStringHandler.h>
 #include <relpipe/reader/handlers/AttributeMetadata.h>
 
+#include "PosixMQ.h"
+
 namespace relpipe {
 namespace out {
 namespace posixmq {
 
 class PosixMQHandler : public relpipe::reader::handlers::RelationalReaderStringHandler {
 private:
-	
+	std::wstring_convert<codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings.
+	shared_ptr<PosixMQ> mq;
+
 public:
 
 	PosixMQHandler(std::ostream& output) {
+		relpipe::common::type::StringX queueName = L"/relpipe";
+		mq.reset(PosixMQ::open(convertor.to_bytes(queueName)));
+
 	}
 
 	void startRelation(relpipe::common::type::StringX name, std::vector<relpipe::reader::handlers::AttributeMetadata> attributes) override {
-		
+
 	}
 
 	void attribute(const relpipe::common::type::StringX& value) override {
-		
+		// TODO: send only certain attributes
+		mq->send(convertor.to_bytes(value));
 	}
 
 	void endOfPipe() {
-		
+
 	}
 
 };