diff -r 0799eaf338b9 -r 610783d70ae9 src/MQTTCommand.cpp
--- a/src/MQTTCommand.cpp	Sun May 08 21:42:14 2022 +0200
+++ b/src/MQTTCommand.cpp	Sun Jun 05 22:51:45 2022 +0200
@@ -24,6 +24,7 @@
 #include <sstream>
 #include <iomanip>
 #include <random>
+#include <regex>
 
 #include <mosquittopp.h>
 
@@ -57,16 +58,14 @@
 	 */
 	static std::string generateClientID() {
 		std::stringstream result;
-		// result << "relpipe-in-";
 		std::string symbols("0123456789abcdef");
 
 		std::random_device dev;
 		std::mt19937 rng(dev());
-		std::uniform_int_distribution<std::mt19937::result_type> dist6(0, symbols.size());
+		std::uniform_int_distribution<std::mt19937::result_type> dist(0, symbols.size());
 
-		for (int i = 0; i < 8; i++) result << symbols[dist6(rng)];
+		for (int i = 0; i < 8; i++) result << symbols[dist(rng)];
 
-		// std::cerr << "generated clien ID = " << result.str() << std::endl;
 		return result.str();
 	}
 public:
@@ -91,6 +90,21 @@
 
 };
 
+void MQTTCommand::parseConnectionString(const std::string& connectionString, std::string& hostname, int& port) {
+	std::regex pattern("mqtt:(//)?([^:]+)(:([0-9]+))?");
+	std::smatch match;
+	if (std::regex_match(connectionString, match, pattern)) {
+		hostname = match[2];
+		port = stoi(match[4]);
+	} else {
+		throw std::invalid_argument("Invalid connection string format. Expecting something like: mqtt://localhost:1883");
+	}
+}
+
+void MQTTCommand::check(std::string operation, int result) {
+	if (result) throw std::logic_error("mosquitto operation failed: " + operation + " = " + std::to_string(result));
+}
+
 void MQTTCommand::process(std::shared_ptr<writer::RelationalWriter> writer, Configuration& configuration) {
 	std::shared_ptr<MQTTClient> mq = std::make_shared<MQTTClient>(writer, configuration);
 
@@ -100,17 +114,33 @@
 		{L"data", TypeId::STRING}
 	}, true);
 
-	mq->max_inflight_messages_set(1);
-	mq->connect("localhost", 1883);
+	std::string connectionString = convertor.to_bytes(configuration.connectionString);
+	std::string username;
+	std::string password;
+	std::string hostname;
+	int port;
+
+	parseConnectionString(connectionString, hostname, port);
+
+	for (auto o : configuration.connectionOptions) {
+		if (o.name == L"username") username = convertor.to_bytes(o.value);
+		else if (o.name == L"password") password = convertor.to_bytes(o.value);
+		else throw std::invalid_argument("Unsupported connection option: " + convertor.to_bytes(o.name));
+	}
+
+	if (username.size()) check("set credentials", mq->username_pw_set(username.c_str(), password.c_str()));
+
+	check("set maximum inflight messages", mq->max_inflight_messages_set(1));
+	check("connect", mq->connect(hostname.c_str(), port));
 	int mid;
-	mq->subscribe(&mid, convertor.to_bytes(configuration.stream).c_str());
+	check("substcribe", mq->subscribe(&mid, convertor.to_bytes(configuration.stream).c_str()));
 
 	//for (int i = configuration.messageCount; continueProcessing && i > 0; i--) {
 	for (int i = configuration.messageCount; continueProcessing && i > 0; i = i - mq->popMessageCount()) {
 		// std::cerr << "loop(): i=" << i << std::endl;
 
 		//mq->loop();
-		mq->loop(1000, 1);
+		check("loop", mq->loop(1000, 1));
 		//mq->loop(1000, -1);
 		//mq->loop_forever();
 		//mq->loop_write();