34 lines
1.2 KiB
C
34 lines
1.2 KiB
C
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// Copyright 2023 Dexter.Wan. All Rights Reserved.
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// EMail: 45141961@qq.com
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#if !defined(SUBOPTS_H)
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#define SUBOPTS_H
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/** The MQTT V5 subscribe options, apart from QoS which existed before V5. */
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typedef struct MQTTSubscribe_options
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{
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/** The eyecatcher for this structure. Must be MQSO. */
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char struct_id[4];
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/** The version number of this structure. Must be 0.
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*/
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int struct_version;
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/** To not receive our own publications, set to 1.
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* 0 is the original MQTT behaviour - all messages matching the subscription are received.
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*/
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unsigned char noLocal;
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/** To keep the retain flag as on the original publish message, set to 1.
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* If 0, defaults to the original MQTT behaviour where the retain flag is only set on
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* publications sent by a broker if in response to a subscribe request.
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*/
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unsigned char retainAsPublished;
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/** 0 - send retained messages at the time of the subscribe (original MQTT behaviour)
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* 1 - send retained messages on subscribe only if the subscription is new
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* 2 - do not send retained messages at all
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*/
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unsigned char retainHandling;
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} MQTTSubscribe_options;
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#define MQTTSubscribe_options_initializer { {'M', 'Q', 'S', 'O'}, 0, 0, 0, 0 }
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#endif
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