nng_mqtt_msg_alloc.3.adoc

nng_mqtt_msg_alloc(3)

NAME

nng_mqtt_msg_alloc - allocate a message with proto_data for mqtt

SYNOPSIS

#include <nng/nng.h>

int nng_mqtt_msg_alloc(nng_msg **msgp, size_t size);

DESCRIPTION

The nng_mqtt_msg_alloc() function allocates a new message with body length size and stores the result in msgp. Messages allocated with this function contain a body and optionally a header and proto_data. They are used with receive and transmit functions.

RETURN VALUES

This function returns 0 on success, and non-zero otherwise.

ERRORS

NNG_ENOMEM

Insufficient free memory exists to allocate a message.

SEE ALSO

nng_mqtt_msg_decode(3), nng_mqtt_msg_encode(3), nng_msg_free(3), nng_msg_body(3), nng_msg_dup(3), nng_msg_header(3), nng_msg_header_len(3), nng_msg_len(3), nng_msg_capacity(3), nng_msg_reserve(3), nng_msg_realloc(3), nng_strerror(3), nng_msg(5), nng(7)