|  | Paho Asynchronous MQTT C Client Library
    | 
#include <MQTTAsync.h>
| Data Fields | |
| char | struct_id [4] | 
| int | struct_version | 
| MQTTAsync_token | token | 
| enum MQTTReasonCodes | reasonCode | 
| MQTTProperties | properties | 
| int | code | 
| const char * | message | 
| int | packet_type | 
The data returned on completion of an unsuccessful API call in the response callback onFailure.
| char struct_id[4] | 
The eyecatcher for this structure. Will be MQFD.
| int struct_version | 
The version number of this structure. Will be 0
| MQTTAsync_token token | 
A token identifying the failed request.
| enum MQTTReasonCodes reasonCode | 
The MQTT reason code returned.
| MQTTProperties properties | 
The MQTT properties on the ack, if any.
| int code | 
A numeric code identifying the MQTT client library error.
| const char* message | 
Optional further text explaining the error. Can be NULL.
| int packet_type | 
Packet type on which the failure occurred - used for publish QoS 1/2 exchanges
 1.8.17
 1.8.17