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Tag properties can be filtered/blocked from being published by Transmission or can be filtered/ignored by Engine.

In either case, you can add the JSON/Scripting Name for the tag property to the Filtered Properties list in the appropriate module configuration.

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


For MQTT Transmission, the Filter Properties list is available under Transmitters > Advanced settings

For MQTT Engine, the Filtered Properties list is available under General > Advanced


The Filtered Properties list is a semicolon delimited list of Tag properties and by default contains: 

accessRights;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;parentEnabled;sourceTagPath


For example, to exclude the tag properties Engineering Units (engUnit), Engineering High Limit (engHigh) and Engineering Low Limit (engLow) from being published from Transmission you would extend the Filtered Properties as:

engUnit;engHigh;engLow;accessRights;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;parentEnabled;sourceTagPath


Known caveats:

If scaling is defined on an edge side tag and scaling properties are not filtered at Engine and Transmission, the scaling will be applied twice




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