83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
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#ifndef HV_MQTT_PROTOCOL_H_
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#define HV_MQTT_PROTOCOL_H_
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#include "hexport.h"
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#define DEFAULT_MQTT_PORT 1883
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#define MQTT_PROTOCOL_V31 3
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#define MQTT_PROTOCOL_V311 4
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#define MQTT_PROTOCOL_V5 5 // Not yet supproted
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#define MQTT_PROTOCOL_NAME "MQTT"
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#define MQTT_PROTOCOL_NAME_v31 "MQIsdp"
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/*
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* connect flags
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* 0 1 2 3-4 5 6 7
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* reserved clean_session has_will will_qos will_retain has_password has_username
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*/
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#define MQTT_CONN_CLEAN_SESSION 0x02
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#define MQTT_CONN_HAS_WILL 0x04
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#define MQTT_CONN_WILL_RETAIN 0x20
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#define MQTT_CONN_HAS_PASSWORD 0x40
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#define MQTT_CONN_HAS_USERNAME 0x80
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typedef enum {
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MQTT_TYPE_CONNECT = 1,
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MQTT_TYPE_CONNACK = 2,
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MQTT_TYPE_PUBLISH = 3,
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MQTT_TYPE_PUBACK = 4,
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MQTT_TYPE_PUBREC = 5,
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MQTT_TYPE_PUBREL = 6,
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MQTT_TYPE_PUBCOMP = 7,
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MQTT_TYPE_SUBSCRIBE = 8,
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MQTT_TYPE_SUBACK = 9,
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MQTT_TYPE_UNSUBSCRIBE = 10,
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MQTT_TYPE_UNSUBACK = 11,
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MQTT_TYPE_PINGREQ = 12,
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MQTT_TYPE_PINGRESP = 13,
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MQTT_TYPE_DISCONNECT = 14,
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} mqtt_type_e;
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typedef enum {
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MQTT_CONNACK_ACCEPTED = 0,
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MQTT_CONNACK_REFUSED_PROTOCOL_VERSION = 1,
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MQTT_CONNACK_REFUSED_IDENTIFIER_REJECTED = 2,
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MQTT_CONNACK_REFUSED_SERVER_UNAVAILABLE = 3,
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MQTT_CONNACK_REFUSED_BAD_USERNAME_PASSWORD = 4,
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MQTT_CONNACK_REFUSED_NOT_AUTHORIZED = 5,
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} mqtt_connack_e;
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typedef struct mqtt_head_s {
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unsigned char type: 4;
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unsigned char dup: 1;
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unsigned char qos: 2;
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unsigned char retain: 1;
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unsigned int length;
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} mqtt_head_t;
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typedef struct mqtt_message_s {
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unsigned int topic_len;
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const char* topic;
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unsigned int payload_len;
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const char* payload;
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unsigned char qos;
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unsigned char retain;
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} mqtt_message_t;
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BEGIN_EXTERN_C
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#define DEFAULT_MQTT_PACKAGE_MAX_LENGTH (1 << 28) // 256M
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HV_INLINE int mqtt_estimate_length(mqtt_head_t* head) {
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// 28 bits => 4*7 bits varint
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return 1 + 4 + head->length;
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}
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HV_EXPORT int mqtt_head_pack(mqtt_head_t* head, unsigned char buf[]);
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HV_EXPORT int mqtt_head_unpack(mqtt_head_t* head, const unsigned char* buf, int len);
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END_EXTERN_C
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#endif // HV_MQTT_PROTOCOL_H_
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