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net: mqtt: add mqtt_readall_publish_payload()

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This function uses mqtt_read_publish_payload_blocking to perform a
blocking read of the specified number of bytes.

When reading out a payload, the normal use case is to read the
entire payload. This function facilitates that use case.

Signed-off-by: Håkon Øye Amundsen <haakon.amundsen@nordicsemi.no>
This commit is contained in:
Håkon Øye Amundsen 2019-06-18 21:12:11 +00:00 • committed by Jukka Rissanen
commit 05cd3420ac
3 changed files with 49 additions and 20 deletions
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15
include/net/mqtt.h
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@ -715,6 +715,21 @@ int mqtt_read_publish_payload(struct mqtt_client *client, void *buffer,
int mqtt_read_publish_payload_blocking(struct mqtt_client *client, void *buffer,
size_t length);
/**
* @brief Blocking version of @ref mqtt_read_publish_payload function which
* runs until the required number of bytes are read.
*
* @param[in] client Client instance for which the procedure is requested.
* Shall not be NULL.
* @param[out] buffer Buffer where payload should be stored.
* @param[in] length Number of bytes to read.
*
* @return 0 if success, otherwise a negative error code (errno.h) indicating
* reason of failure.
*/
int mqtt_readall_publish_payload(struct mqtt_client *client, u8_t *buffer,
size_t length);
#ifdef __cplusplus
}
#endif