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MQTT Transmission will publish all any non-filtered tag properties which are different from the default Ignition tag property setting in a BIRTH message.

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Filtering or blocking the publish of tag properties

MQTT Transmission can be configured to flitterfilter/block tag properties from being published. The filtered properties list is configured here and by default contains:

 accessRightsaccessRights;clampMode;deadband;deadbandMode;formatString;historicalDeadband;historicalDeadbandMode;historicalDeadbandStyle;historyEnabled;historyMaxAge;historyMaxAgeUnits;historyProvider;historySampleRate;historySampleRateUnits;historyTagGroup;historyTimeDeadband;historyTimeDeadbandUnits;opcItemPath;opcServer;permissionModel;rawHigh;rawLow;sampleMode;scaleFactor;scaleMode;scaledHigh;scaledLow;tagGroup;valueSource;expression;expressionType;ConfiguredTagPath;eventScripts;readPermissions;writePermissions;eventScripts

Discrepancy with tag properties at MQTT Engine

If you make tag property changes at MQTT Engine, you will see that these changes are overwritten when the next BIRTH message is received for example on a Transmission refresh or disconnect/reconnect. 

This is because the Edge is considered the 'source of truth' for the tag data and it is recommended that tag properties are made at the Edge and propagated to MQTT Engine.

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