Minimum Configuration

This topic relates to Device items on the MQTT JSON Schema A driver.

When you add an item to the database, various properties on the item's configuration Form are assigned a value automatically. These default values are assigned on creation of the database item, to help reduce the amount of manual configuration that is required. As such, you only need configure a subset of the properties that exist on an item's configuration Form. Typically, the properties you have to configure include:

• Those properties that require a value, but for which the property field is blank
• Those properties for which the value needs to differ from the default.

For a Device item on this driver to be capable of functioning in Geo SCADA Expert, as a minimum you have to specify these properties on the item's configuration Form (the properties are on the MQTT tab):

• The Broker from which Geo SCADA Expert is to retrieve the topic data
• The Topic Filter.

Also ensure that the Device item is In Service, and has saved, valid configuration. This will produce a Device item that is capable of functioning using the default configuration settings.