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By default the MQTT messages from Transmission are sent only upon Value or Quality changes and there is no provision to resend a single Tag or Device level Tags at any interval if the values have not changed.

However, MQTT Transmission has control tags that allow you to request the Edge for a Node Refresh or a full Transmission refresh. This forces the Edge Node, or all Edge Nodes, to disconnect and reconnect resulting in the sending of NDEATH, NBIRTH and DBIRTH messages for Edge Node(s). 

The timestamp for the tag each included in the BIRTH message will be the timestamp of the BIRTH message.


A full Transmission refresh is requested using the '[MQTT Transmission]Transmission Control/Refresh' tag.  

An Edge Node specific refresh is requested using the '[MQTT Transmission]Transmission Info/Transmitters/TRANSMITTER_NAME/Edge Nodes/GROUP_ID/EDGE_NODE_ID/Refresh Edge Node' tag. 


These can be scripted for either period or on specific Tag changes with the Gateway Events script tools.


Please reference the Using the MQTT Transmissions 'Refresh' Mechanism tutorial and the MT: Tags document for additional information for these control tags.



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