Minimum Configuration

This topic relates to Brokers on the MQTT 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 Broker 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 (all of the properties are on the Broker tab):

• Broker Host Address
• Client Identifier

If the broker that this Broker item represents has been configured to require them, you also need to configure:

• User Name
• Password

For secure sessions with encrypted data transmissions, you also need to configure:

• Port (set this to 8883)
• The relevant properties in the Security section of the Broker tab.

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

WARNING

POTENTIAL SECURITY BREACH

We strongly recommend using network-connected Geo SCADA Expert drivers in a private network only (either physical or virtual). We recommend against using such drivers for communications over the public Internet. If the drivers are used over the public Internet, as a minimum those drivers should use valid SSL certificates to initiate secure connections and encrypt the data that is transmitted over the network.

Failure to follow these instructions can result in death, serious injury, or equipment damage. The breach in system security could expose sensitive data and the leave the database vulnerable to unauthorized and potentially malicious use.