Broker connection in SparkplugCmd utility
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The primary means of specifying the broker connection in the SparkplugCmd is the resourceDescriptor arguments to commands such as consumer or edgeNode. The resourceDescriptor is an URL of the broker, and it defaults to "mqtt://localhost", which specifies a non-authenticated TCP connection to the MQTT broker residing on the local machine, using port 1883. For further information on the URL syntax in resourceDescriptor, and the configurable parameters of the MQTT channel, see OpcLabs.MqttNet communication package.
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