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89 lines
3.2 KiB
89 lines
3.2 KiB
/*
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* Copyright (C) 2022,2023,2025 by Jonathan Naylor G4KLX
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#if !defined(MQTTCONNECTION_H)
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#define MQTTCONNECTION_H
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#if defined(MQTT)
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#include <mosquitto.h>
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#include <atomic>
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#include <vector>
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#include <string>
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/*
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* Thin wrapper around the libmosquitto client for publish-only MQTT telemetry.
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*
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* open() initialises the mosquitto client, registers callbacks, and starts the
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* internal mosquitto network loop thread (mosquitto_loop_start). After open()
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* returns, publish() can be called from any thread; mosquitto handles its own
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* thread safety internally.
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*
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* Topics without a '/' are automatically prefixed with the configured name
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* (e.g. "log" becomes "MyRepeater/log"). Topics containing '/' are used as-is.
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*
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* Optional subscriptions can be provided via the subs vector; each entry pairs
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* a topic string with a callback function invoked on incoming messages.
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*
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* This class is compiled only when MQTT=1 is passed to make.
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*/
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enum class MQTT_QOS : int {
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AT_MODE_ONCE = 0,
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AT_LEAST_ONCE = 1,
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EXACTLY_ONCE = 2
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};
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class CMQTTConnection {
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public:
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CMQTTConnection(const std::string& host, unsigned short port, const std::string& name, const bool authEnabled, const std::string& username, const std::string& password, const std::vector<std::pair<std::string, void (*)(const unsigned char*, unsigned int)>>& subs, unsigned int keepalive, MQTT_QOS qos = MQTT_QOS::EXACTLY_ONCE);
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~CMQTTConnection();
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bool open();
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bool publish(const char* topic, const char* text);
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bool publish(const char* topic, const std::string& text);
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bool publish(const char* topic, const unsigned char* data, unsigned int len);
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void close();
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private:
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std::string m_host;
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unsigned short m_port;
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std::string m_name; // Prefix prepended to bare topic strings.
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bool m_authEnabled;
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std::string m_username;
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std::string m_password;
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std::vector<std::pair<std::string, void (*)(const unsigned char*, unsigned int)>> m_subs;
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unsigned int m_keepalive;
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MQTT_QOS m_qos;
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mosquitto* m_mosq;
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std::atomic<bool> m_connected; // Set true in onConnect, false in onDisconnect.
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// Mosquitto event callbacks (called on the internal mosquitto thread).
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static void onConnect(mosquitto* mosq, void* obj, int rc);
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static void onSubscribe(mosquitto* mosq, void* obj, int mid, int qosCount, const int* grantedQOS);
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static void onMessage(mosquitto* mosq, void* obj, const mosquitto_message* message);
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static void onDisconnect(mosquitto* mosq, void* obj, int rc);
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};
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#endif
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#endif
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