#include <MQTTAsync.h>

Public 属性
char	struct_id [4]

int	struct_version

const char *	topicName

const char *	message

int	retained

int	qos

struct {
int len

const void * data

}	payload

详细描述

MQTTAsync_willOptions defines the MQTT "Last Will and Testament" (LWT) settings for the client. In the event that a client unexpectedly loses its connection to the server, the server publishes the LWT message to the LWT topic on behalf of the client. This allows other clients (subscribed to the LWT topic) to be made aware that the client has disconnected. To enable the LWT function for a specific client, a valid pointer to an MQTTAsync_willOptions structure is passed in the MQTTAsync_connectOptions structure used in the MQTTAsync_connect() call that connects the client to the server. The pointer to MQTTAsync_willOptions can be set to NULL if the LWT function is not required.

在文件 MQTTAsync.h 第 999 行定义.

类成员变量说明

const void* MQTTAsync_willOptions::data

binary payload data

在文件 MQTTAsync.h 第 1024 行定义.

int MQTTAsync_willOptions::len

binary payload length

在文件 MQTTAsync.h 第 1023 行定义.

const char* MQTTAsync_willOptions::message

The LWT payload.

在文件 MQTTAsync.h 第 1010 行定义.

struct { ... } MQTTAsync_willOptions::payload

The LWT payload in binary form. This is only checked and used if the message option is NULL

int MQTTAsync_willOptions::qos

The quality of service setting for the LWT message (see MQTTAsync_message.qos and qos).

在文件 MQTTAsync.h 第 1019 行定义.

int MQTTAsync_willOptions::retained

The retained flag for the LWT message (see MQTTAsync_message.retained).

在文件 MQTTAsync.h 第 1014 行定义.

char MQTTAsync_willOptions::struct_id[4]

The eyecatcher for this structure. must be MQTW.

在文件 MQTTAsync.h 第 1002 行定义.

int MQTTAsync_willOptions::struct_version

The version number of this structure. Must be 0 or 1 0 indicates no binary will message support

在文件 MQTTAsync.h 第 1006 行定义.

const char* MQTTAsync_willOptions::topicName

The LWT topic to which the LWT message will be published.

在文件 MQTTAsync.h 第 1008 行定义.

该结构体的文档由以下文件生成:

tqinclude/paho_mqtt_c/MQTTAsync.h

Public 属性

详细描述

类成员变量说明