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If you are updating from a previous version of MQTT Engine to v4.0.14, the configuration of the Legacy State template will be completed as part of the upgrade process and the Legacy Client enabled.
| Warning |
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MQTT Engine will always attempt to publish/subscribe using the new STATE message format even when the Legacy Client is enabled and there is no means to disable this. If you have restrictive Access Controls Lists configured at your broker you will need to allow access to the spBv1.0/STATE/ topic |
If However, if using MQTT Distributor you will see that the tag [MQTT Distributor]Distributor Info/Connected Clients has increased by one. If you have scripting or an application using this tag value, then you will likely need to make the appropriate changes to accommodate this increase in the connected client count.
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The additional legacy STATE client is configured under the Advanced section for each of the configured MQTT servers in the MQTT Engine module configuration. The Legacy State template will be automatically populated with the variables from the server configuration Main and TLS sections if you are updating from a previous version of MQTT Engine to v4.0.14.
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To disable, you simply deselect the Enable Legacy STATE messages option. To fully remove the retained legacy STATE message at the server, you will need to restart any connected server.
Which clients will be created?
With Primary Host Disabled and Legacy Host Disabled
- ME client created, connects and subscribes [[a/#][0], [spBv1.0/#][0]]
With Primary Host Enabled and Legacy Host Disabled
- ME client created, connects and subscribes [[a/#][0], [spBv1.0/#][0], [spBv1.0/STATE/MyPrimaryHost][1]]
With Primary Host Disabled and Legacy Host Enabled
- ME client created, connects and subscribes [[a/#][0], [spBv1.0/#][0]]
- ME-LS client created but no connection made
With Primary Host Enabled and Legacy Host Enabled
- ME client created, connects and subscribes [[a/#][0], [spBv1.0/#][0], [spBv1.0/STATE/MyPrimaryHost][1]]
- ME-LS client created, connects and subscribes [[STATE/MyPrimaryHost][1]]
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