start mqtt client (based on paho.mqtt.c), basically works

libs/main/mqtt_client/pimqttclient.cpp

@@ -0,0 +1,255 @@
+/*
+	PIP - Platform Independent Primitives
+	MQTT Client
+	Ivan Pelipenko peri4ko@yandex.ru
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU Lesser General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU Lesser General Public License for more details.
+
+	You should have received a copy of the GNU Lesser General Public License
+	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "pimqttclient.h"
+
+#include "MQTTClient.h"
+
+
+STATIC_INITIALIZER_BEGIN
+	MQTTClient_init_options opts = MQTTClient_init_options_initializer;
+	MQTTClient_global_init(&opts);
+STATIC_INITIALIZER_END
+
+
+PRIVATE_DEFINITION_START(PIMQTT::Client)
+	MQTTClient client = nullptr;
+	bool connected    = false;
+
+	static void connectionLost_callback(void * context, char *) {
+		((PIMQTT::Client *)context)->mqtt_connectionLost();
+	}
+
+	static void deliveryComplete_callback(void * context, MQTTClient_deliveryToken dt) {
+		((PIMQTT::Client *)context)->mqtt_deliveryComplete(dt);
+	}
+
+	static int messageArrived_callback(void * context, char * topicName, int topicLen, MQTTClient_message * message) {
+		PIMQTT::Message msg;
+		msg.topic        = PIString::fromUTF8(topicName);
+		msg.payload      = PIByteArray(message->payload, message->payloadlen);
+		msg.msg_id       = message->msgid;
+		msg.is_duplicate = message->dup != 0;
+		msg.qos          = static_cast<PIMQTT::QoS>(message->qos);
+		MQTTClient_freeMessage(&message);
+		MQTTClient_free(topicName);
+		((PIMQTT::Client *)context)->mqtt_messageArrived(msg);
+		return 1;
+	}
+
+PRIVATE_DEFINITION_END(PIMQTT::Client)
+
+
+PIMQTT::Client::Client() {
+	thread = new PIThread([this] { run(); });
+	thread->start();
+}
+
+
+PIMQTT::Client::~Client() {
+	thread->stop();
+	disconnect();
+	thread->waitForFinish();
+	piDeleteSafety(thread);
+}
+
+
+void PIMQTT::Client::connect(const PIString & address, const PIString & client, const PIString & username, const PIString & password) {
+	auto ci      = connect_info.getRef();
+	ci->address  = address;
+	ci->clientID = client;
+	ci->username = username;
+	ci->password = password;
+	changeStatus(Connecting);
+}
+
+
+void PIMQTT::Client::disconnect() {
+	changeStatus(Disconnecting);
+}
+
+
+void PIMQTT::Client::subscribe(const PIString & topic, QoS qos) {
+	sub_queue.getRef()->enqueue({topic, qos});
+	notifier.notify();
+}
+
+
+void PIMQTT::Client::unsubscribe(const PIString & topic) {
+	unsub_queue.getRef()->enqueue(topic);
+	notifier.notify();
+}
+
+
+void PIMQTT::Client::publish(const PIString & topic, const PIByteArray & msg, QoS qos) {
+	Message m;
+	m.topic   = topic;
+	m.payload = msg;
+	m.qos     = qos;
+	pub_queue.getRef()->enqueue(m);
+	notifier.notify();
+}
+
+
+void PIMQTT::Client::mqtt_connectionLost() {
+	piCoutObj << "mqtt_connectionLost";
+	PRIVATE->connected = false;
+	changeStatus(Idle);
+	disconnected(Error::ServerUnavailable);
+}
+
+
+void PIMQTT::Client::mqtt_deliveryComplete(int token) {}
+
+
+void PIMQTT::Client::mqtt_messageArrived(const Message & msg) {
+	piCoutObj << "mqtt_messageArrived";
+	received(msg);
+}
+
+
+void PIMQTT::Client::connectInternal() {
+	destroy();
+	PRIVATE->connected        = false;
+	auto ci                   = connect_info.get();
+	PINetworkAddress net_addr = PINetworkAddress::resolve(ci.address);
+	if (net_addr.port() == 0) net_addr.setPort(1883);
+	PIString server_uri = "tcp://" + net_addr.toString();
+	MQTTClient_create(&PRIVATE->client, server_uri.dataAscii(), ci.clientID.dataUTF8(), MQTTCLIENT_PERSISTENCE_NONE, nullptr);
+	MQTTClient_setCallbacks(PRIVATE->client,
+							this,
+							PRIVATE->connectionLost_callback,
+							PRIVATE->messageArrived_callback,
+							PRIVATE->deliveryComplete_callback);
+	MQTTClient_connectOptions conn_opts = MQTTClient_connectOptions_initializer;
+	conn_opts.keepAliveInterval         = 9;
+	conn_opts.cleansession              = 1;
+	conn_opts.connectTimeout            = piRound(connect_timeout.toSeconds());
+	if (ci.username.isNotEmpty()) conn_opts.username = ci.username.dataAscii();
+	if (ci.password.isNotEmpty()) conn_opts.password = ci.password.dataAscii();
+	int ret = MQTTClient_connect(PRIVATE->client, &conn_opts);
+	if (ret != MQTTCLIENT_SUCCESS) {
+		piCoutObj << "Failed to connect to " + server_uri << ", code" << ret;
+		changeStatus(Idle);
+		if (ret < 0) ret = static_cast<int>(Error::ServerUnavailable);
+		disconnected(static_cast<Error>(ret));
+		return;
+	}
+	PRIVATE->connected = true;
+	changeStatus(Connected);
+	connected();
+}
+
+
+void PIMQTT::Client::publishInternal(const Message & m) {
+	if (!PRIVATE->client) return;
+	MQTTClient_message pubmsg = MQTTClient_message_initializer;
+	pubmsg.payload            = const_cast<void *>(static_cast<const void *>(m.payload.data()));
+	pubmsg.payloadlen         = m.payload.size_s();
+	pubmsg.qos                = static_cast<int>(m.qos);
+	int ret                   = MQTTClient_publishMessage(PRIVATE->client, m.topic.dataAscii(), &pubmsg, nullptr);
+	if (ret != MQTTCLIENT_SUCCESS) {
+		piCoutObj << "Failed to publishMessage, code" << ret;
+	}
+}
+
+
+void PIMQTT::Client::subscribeInternal(const Subscribe & sub) {
+	if (!PRIVATE->client) return;
+	int ret = MQTTClient_subscribe(PRIVATE->client, sub.topic.dataUTF8(), static_cast<int>(sub.qos));
+	if (ret != MQTTCLIENT_SUCCESS) {
+		piCoutObj << "Failed to subscribe" << sub.topic << ", code" << ret;
+	}
+}
+
+
+void PIMQTT::Client::unsubscribeInternal(const PIString & topic) {
+	if (!PRIVATE->client) return;
+	int ret = MQTTClient_unsubscribe(PRIVATE->client, topic.dataUTF8());
+	if (ret != MQTTCLIENT_SUCCESS) {
+		piCoutObj << "Failed to unsubscribe" << topic << ", code" << ret;
+	}
+}
+
+
+void PIMQTT::Client::destroy() {
+	if (!PRIVATE->client) return;
+	if (PRIVATE->connected) MQTTClient_disconnect(PRIVATE->client, 1000);
+	MQTTClient_destroy(&PRIVATE->client);
+	PRIVATE->connected = false;
+	PRIVATE->client    = nullptr;
+}
+
+
+void PIMQTT::Client::changeStatus(Status s) {
+	m_status = s;
+	notifier.notify();
+}
+
+
+void PIMQTT::Client::run() {
+	notifier.wait();
+	piCoutObj << "run" << (int)m_status;
+	if (thread->isStopping() || m_status == Disconnecting) {
+		bool was_connected = PRIVATE->connected;
+		changeStatus(Idle);
+		destroy();
+		if (was_connected) disconnected(Error::Unknown);
+		PRIVATE->connected = false;
+		return;
+	}
+	if (m_status == Connecting) {
+		connectInternal();
+		return;
+	}
+	if (m_status == Connected) {
+		Subscribe sub;
+		{
+			auto ref = sub_queue.getRef();
+			if (!ref->isEmpty()) sub = ref->dequeue();
+		}
+		if (sub.topic.isNotEmpty()) {
+			subscribeInternal(sub);
+			notifier.notify();
+			return;
+		}
+
+		PIString topic;
+		{
+			auto ref = unsub_queue.getRef();
+			if (!ref->isEmpty()) topic = ref->dequeue();
+		}
+		if (topic.isNotEmpty()) {
+			unsubscribeInternal(topic);
+			notifier.notify();
+			return;
+		}
+
+		Message msg;
+		{
+			auto ref = pub_queue.getRef();
+			if (!ref->isEmpty()) msg = ref->dequeue();
+		}
+		if (msg.isValid()) {
+			publishInternal(msg);
+			notifier.notify();
+			return;
+		}
+	}
+}

libs/main/mqtt_client/pimqttclient.h

@@ -0,0 +1,112 @@
+//! \~\file pimqttclient.h
+//! \~\ingroup MQTT
+//! \~\brief
+//! \~english
+//! \~russian
+/*
+	PIP - Platform Independent Primitives
+	MQTT Client
+	Ivan Pelipenko peri4ko@yandex.ru
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU Lesser General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU Lesser General Public License for more details.
+
+	You should have received a copy of the GNU Lesser General Public License
+	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef pimqttclient_h
+#define pimqttclient_h
+
+#include "piliterals_time.h"
+#include "pimqtttypes.h"
+#include "piprotectedvariable.h"
+#include "pithread.h"
+
+
+namespace PIMQTT {
+
+
+class PIP_EXPORT Client: public PIObject {
+	PIOBJECT(PIMQTT::Client)
+
+public:
+	Client();
+	virtual ~Client();
+
+	void setConnectTimeout(PISystemTime time) { connect_timeout = time; }
+
+	void connect(const PIString & address, const PIString & client, const PIString & username = {}, const PIString & password = {});
+	void disconnect();
+
+	void subscribe(const PIString & topic, QoS qos = QoS::Level1);
+	void unsubscribe(const PIString & topic);
+
+	void publish(const PIString & topic, const PIByteArray & msg, QoS qos = QoS::Level0);
+	void unsubscribeAll() { unsubscribe("#"); }
+
+	bool isConnecting() const { return m_status == Connecting; }
+	bool isConnected() const { return m_status == Connected; }
+
+	EVENT0(connected);
+	EVENT1(disconnected, PIMQTT::Error, code);
+	EVENT1(received, PIMQTT::Message, message);
+
+private:
+	NO_COPY_CLASS(Client)
+
+	PRIVATE_DECLARATION(PIP_EXPORT)
+
+	enum Status {
+		Idle,
+		Connecting,
+		Connected,
+		Disconnecting,
+	};
+
+	struct ConnectInfo {
+		PIString address;
+		PIString clientID;
+		PIString username;
+		PIString password;
+	};
+	struct Subscribe {
+		PIString topic;
+		QoS qos;
+	};
+
+	void mqtt_connectionLost();
+	void mqtt_deliveryComplete(int token);
+	void mqtt_messageArrived(const Message & msg);
+
+	void connectInternal();
+	void publishInternal(const Message & m);
+	void subscribeInternal(const Subscribe & sub);
+	void unsubscribeInternal(const PIString & topic);
+	void destroy();
+	void changeStatus(Status s);
+
+	void run();
+
+	PIProtectedVariable<PIQueue<Message>> pub_queue;
+	PIProtectedVariable<PIQueue<Subscribe>> sub_queue;
+	PIProtectedVariable<PIQueue<PIString>> unsub_queue;
+	PIProtectedVariable<ConnectInfo> connect_info;
+	PIThreadNotifier notifier;
+	std::atomic_int m_status     = {Idle};
+	PISystemTime connect_timeout = 10_s;
+	PIThread * thread            = nullptr;
+};
+
+
+}; // namespace PIMQTT
+
+
+#endif