Create an Analog Point

Add an MQTT JSON Schema A Analog Point to the database. This type of database item is available from the JSON Schema A sub-branch within the MQTT branch of the Create New menu. The sub-branch corresponds to the message format that Geo SCADA Expert is to use to communicate with the broker.

Geo SCADA Expert will use this point to store the data that it retrieves and processes from one of the analog tags for which the MQTT client publishes data.

When you create the point, you can leave most of the configuration fields at their default values.

On the Analog Point tab of the configuration Form, the only fields that you need to change for this tutorial are:

• In Service—Select this check box so that it displays a check mark.
• Device—Specify the MQTT JSON Schema A Device item that you created earlier in this tutorial.
• Tag Name—Specify the exact name of the analog tag (item of data) that this particular Point is to represent in the database.

  Geo SCADA Expert retrieves the tag from the MQTT messages that are published by the device. The messages must be in a format that the MQTT JSON Schema A driver supports (see Supported Message Formats).

  With the MQTT driver and extension drivers, 'time' and 'status' are reserved words. As such, 'time' and 'status' cannot be used for tag names.

  Tag names are case-sensitive.

On the Historic tab:

• Enabled—Select this check box so that it displays a check mark.

Save the configuration.

Once you have configured the analog point, you can proceed to Create Another Analog Point.