MQTTAsync_willOptions
#include <MQTTAsync.h>
char
struct_id [4]
int struct_version
const char * topicName
const char * message
int retained
int qos
struct {
int len
const void * data
} payload
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.
The eyecatcher for this structure. must be MQTW.
The version number of this structure. Must be 0 or 1 0 indicates no binary will message support
The LWT topic to which the LWT message will be published.
The LWT payload.
The retained flag for the LWT message (see MQTTAsync_message.retained).
The quality of service setting for the LWT message (see MQTTAsync_message.qos and Quality of service).
binary payload length
binary payload data
The LWT payload in binary form. This is only checked and used if the message option is NULL
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