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Stored procedures
ConstantAffectsUsed by the functions
Versions 22 and later
mqttQualityAtLeastOnce
New in version 22
mqttQualityAtLeastOnce
mqttQualityAtLeastOnce
The message will be delivered at least once. The client will transmit the message several times if necessary until the server (broker) confirms that the message was transmitted on the network.MQTTSubscribe, MQTTPublish
Versions 22 and later
mqttQualityAtMostOnce
New in version 22
mqttQualityAtMostOnce
mqttQualityAtMostOnce
The message will be delivered once at most. The message is not stored. It is sent without guarantee of receipt. The MQTT (broker) does not inform the sender that the message was received. The message can be lost if the client is disconnected or if the server is stopped.MQTTSubscribe, MQTTPublish
Versions 22 and later
mqttQualityExactlyOnce
New in version 22
mqttQualityExactlyOnce
mqttQualityExactlyOnce
The message will be necessarily saved by the issuer. It will be transmitted as long as the receiver does not confirm its sending on the network. The issuer is using a sophisticated recognition with the server (broker) to avoid duplicating messages. This mode is slower but it is more secure.MQTTSubscribe, MQTTPublish
Minimum required version
  • Version 22
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