MQTT.h

#if !defined(_RADIOLIB_MQTT_H)
#define _RADIOLIB_MQTT_H

#include "../../TypeDef.h"

#if !defined(RADIOLIB_EXCLUDE_MQTT)

#include "../TransportLayer/TransportLayer.h"

// MQTT packet types
#define MQTT_CONNECT                                  0x01
#define MQTT_CONNACK                                  0x02
#define MQTT_PUBLISH                                  0x03
#define MQTT_PUBACK                                   0x04
#define MQTT_PUBREC                                   0x05
#define MQTT_PUBREL                                   0x06
#define MQTT_PUBCOMP                                  0x07
#define MQTT_SUBSCRIBE                                0x08
#define MQTT_SUBACK                                   0x09
#define MQTT_UNSUBSCRIBE                              0x0A
#define MQTT_UNSUBACK                                 0x0B
#define MQTT_PINGREQ                                  0x0C
#define MQTT_PINGRESP                                 0x0D
#define MQTT_DISCONNECT                               0x0E

// MQTT CONNECT flags
#define MQTT_CONNECT_USER_NAME_FLAG                   0b10000000
#define MQTT_CONNECT_PASSWORD_FLAG                    0b01000000
#define MQTT_CONNECT_WILL_RETAIN                      0b00100000
#define MQTT_CONNECT_WILL_FLAG                        0b00000100
#define MQTT_CONNECT_CLEAN_SESSION                    0b00000010

class MQTTClient {
  public:
    explicit MQTTClient(TransportLayer* tl, uint16_t port = 1883);

    // basic methods

    int16_t connect(const char* host, const char* clientId, const char* userName = "", const char* password = "", uint16_t keepAlive = 60, bool cleanSession = true, const char* willTopic = "", const char* willMessage = "");

    int16_t disconnect();

    int16_t publish(String& topic, String& message);

    int16_t publish(const char* topic, const char* message);

    int16_t subscribe(const char* topicFilter);

    int16_t unsubscribe(const char* topicFilter);

    int16_t ping();

    int16_t check(void (*func)(const char*, const char*));

#ifndef RADIOLIB_GODMODE
  private:
#endif
    TransportLayer* _tl;

    uint16_t _port;
    uint16_t _packetId;

    static size_t encodeLength(uint32_t len, uint8_t* encoded);
    static uint32_t decodeLength(uint8_t* encoded, uint8_t& numBytes);
};

#endif

#endif