|  | MQTT C Client Libraries Internals
    | 
| Data Fields | |
| int | socket | 
| unsigned int | index | 
| size_t | headerlen | 
| char | fixed_header [5] | 
| header plus up to 4 length bytes | |
| size_t | buflen | 
| total length of the buffer | |
| size_t | datalen | 
| current length of data in buf | |
| char * | buf | 
 1.8.17
 1.8.17