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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 to perform either a Node or Full Transmission refresh. This forces the Edge Node(s) to disconnect and reconnect resulting in the sending of NDEATH, NBIRTH and DBIRTH messages for Edge Node(s).
Writes to these control tags can be scripted using any of the available Ignition scripting 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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