OpcLabs.Mqtt communication package

OpcLabs.Mqtt

Specifying the communication package

In order to select this communication package in OPC UA PubSub tools, you need to set a custom property on a PubSub connection as follows:

• Property namespace: http://opclabs.com/OpcUA/PubSub
• Property name: MessageChannel!
• Property value (String): OpcLabs.Mqtt.MqttClientMessageChannel,OpcLabs.Mqtt

How this is done depends on the concrete software you are using.

Configuring the communication package

ClientWaitTimeout
ErrorWaitDelay
MqttConfiguration	General configuration used across the protocol implementation.
MqttConfiguration.AllowWildcardsInTopicFilters	Determines if multi level (#) and single level (+) wildcards are allowed on topic filters. Default value is true.
MqttConfiguration.BufferSize	Size in bytes of the receive buffer of the underlying transport protocol. Only use it when the property applies to the undelrying protocol used.
MqttConfiguration.ConnectionTimeoutSecs	Seconds to wait for a channel connection until the operation timeouts. This value is generally used to wait for the MQTT channel to open. Default value is 5 seconds.
MqttConfiguration.KeepAliveSecs	Seconds to wait for the MQTT Keep Alive mechanism until a Ping packet is sent to maintain the connection alive. Default value is 0 seconds, which means Keep Alive disabled.
MqttConfiguration.MaximumQualityOfService	Maximum Quality of Service (QoS) to support. Default value is AtMostOnce, which means QoS 0.
MqttConfiguration.Port	Port to connect a Client to a Server.
MqttConfiguration.WaitTimeoutSecs	Seconds to wait for an incoming required message until the operation timeouts. This value is generally used to wait for Server or Client acknowledgements. Default value is 5 seconds.
OpenFailureWaitDelay
RemoteDisconnectedWaitDelay