Redundant Servers

Configure redundant servers to define server-level failover for the MQTT adapter. Redundant server settings let you specify additional MQTT broker endpoints that maintains a continuous connection between the MQTT adapter and at least one MQTT data source at all times in case the primary broker is unavailable or the connection is interrupted.

With generic MQTT, the failover process is handled by the client itself. The adapter systematically goes through the list of backup servers until it identifies a server that is accessible and can establish a connection.This approach ensures continuity by allowing the client to switch to an operational server in the event of a failure.

In the case of Sparkplug B, the protocol presumes that redundancy is managed by the MQTT servers themselves. Although the adapter can establish connections with multiple servers concurrently, it is the server pool that determines which server is active.

Note: This is applicable to the MQTT adapter only.

To configure a redundant server:

1. Select Add to display the Add Item window.

   

2. Enter the following required field:

   • Host Name or IP Address - This identifies the MQTT broker endpoint used as a redundant server for failover.

3. Select Save to return to the Redundant Servers page.

   Note: See Optional settings for additional information on defining the remaining redundant server parameters.