diff -r cb9577442d3b -r 1a0fbd17db13 src/MQTTHandler.h
--- a/src/MQTTHandler.h	Fri May 06 23:06:44 2022 +0200
+++ b/src/MQTTHandler.h	Sun May 08 21:42:25 2022 +0200
@@ -23,6 +23,7 @@
 #include <sstream>
 #include <locale>
 #include <codecvt>
+#include <random>
 
 #include <mosquittopp.h>
 
@@ -42,6 +43,25 @@
 private:
 	std::wstring_convert<codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings.
 	Configuration configuration;
+	std::shared_ptr<mosqpp::mosquittopp> mq = std::make_shared<mosqpp::mosquittopp>(generateClientID().c_str());
+
+	/**
+	 * @return unique (random) client ID for MQTT to allow multiple simultaneous connections
+	 */
+	static std::string generateClientID() {
+		std::stringstream result;
+		// result << "relpipe-out-";
+		std::string symbols("0123456789abcdef");
+
+		std::random_device dev;
+		std::mt19937 rng(dev());
+		std::uniform_int_distribution<std::mt19937::result_type> dist6(0, symbols.size());
+
+		for (int i = 0; i < 8; i++) result << symbols[dist6(rng)];
+
+		// std::cerr << "generated clien ID = " << result.str() << std::endl;
+		return result.str();
+	}
 
 	struct CurrentRelation {
 		relpipe::common::type::StringX name;
@@ -53,16 +73,11 @@
 public:
 
 	MQTTHandler(Configuration configuration) : configuration(configuration) {
-
-		{
-			// TODO: remove
-			int major, minor, patch;
-			mosqpp::lib_version(&major, &minor, &patch);
-			std::cerr << "mosquitto version: " << major << "." << minor << "." << patch << std::endl;
-		}
+		mq->connect("localhost", 1883);
 	}
 
 	void startRelation(relpipe::common::type::StringX name, std::vector<relpipe::reader::handlers::AttributeMetadata> attributes) override {
+		// TODO: check relation name according to the configuration
 		currentRelation = CurrentRelation{name, attributes};
 	}
 
@@ -77,13 +92,15 @@
 		currentRelation.attributeIndex++;
 		if (currentRelation.attributeIndex == currentRelation.attributes.size()) {
 			currentRelation.attributeIndex = 0;
-			// FIXME: send the message
+			int mid = -1;
+			mq->publish(&mid, convertor.to_bytes(configuration.stream).c_str(), currentRelation.currentValue.size(), currentRelation.currentValue.c_str());
+			// std::cerr << "MQTT message enqueued: " << mid << std::endl;
 		}
 
 	}
 
 	void endOfPipe() {
-
+		mq->disconnect();
 	}
 
 };