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In MQTT Transmission and MQTT Engine support was added to transmit alarm events from the Edge (MQTT Transmission) to the Central Gateway (MQTT Engine) . They also now support acknowledgements from the Central Gateway (MQTT Engine) back to the Edge (MQTT Transmission).

Note

The Alarm Event Propagation implementation is limited as detailed below:

  • The only alarm properties that are currently propagated are: Name, Priority and Notes.
  • Alarms over the GAN from an Engine gateway where alarms were forwarded over MQTT from Transmission is not currently supported
  • Alarm pipelines and notifications exposed across MQTT along with alarm data is currently not supported
  • Alarm Status Table filtering to a Sparkplug Group/Edge and/or Device ID is not fully supported
    • In release 4.0.28 Sparkplug IDs were added to the source and display path of alarms at MQTT Engine to allow for Alarm Status Table filtering to Sparkplug IDs
    • From release 4.0.28 onward, MQTT Engine supports explicitly inserting alarm events into the Alarm Journal on arrival


To configure alarm event propagation from Transmission to Engine, follow these steps:

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Double check that the wrapper.java.additional.XX=--add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED syntax has been added to the ignition.conf file wrapper.java.additional statements and indexed correctly on both the MQTT Transmission and MQTT Engine Ignition instances.

Code Block
Example

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 from Ignition version 8.1.44

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Code Block

#********************************************************************
# Wrapper Java Properties
#********************************************************************
# Java Application
#  Locate the java binary on the system PATH:
#  Specify a specific java binary:
set.JAVA_HOME=lib/runtime/jre-win
wrapper.java.command=%JAVA_HOME%/bin/java

# Tell the Wrapper to log the full generated Java command line.
#wrapper.java.command.loglevel=INFO

# Java Main class.  This class must implement the WrapperListener interface
#  or guarantee that the WrapperManager class is initialized.  Helper
#  classes are provided to do this for you.  See the Integration section
#  of the documentation for details.
wrapper.java.mainclass=org.tanukisoftware.wrapper.WrapperSimpleApp
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# Java Classpath (include wrapper.jar)  Add class path elements as
#  needed starting from 1
wrapper.java.classpath.1=lib/wrapper.jar
wrapper.java.classpath.2=lib/core/common/*
wrapper.java.classpath.3=lib/core/gateway/*

# Java Library Path (location of Wrapper.DLL or libwrapper.so)
wrapper.java.library.path.1=lib
wrapper.java.library.path.2=lib/core/gateway

# Java Bits.  On applicable platforms, tells the JVM to run in 32 or 64-bit mode.
#wrapper.java.additional.auto_bits=TRUE
wrapper.java.additional.auto_bits.macosx=FALSE

# Java Additional Parameters
wrapper.java.additional.1=-Ddata.dir=data
wrapper.java.additional.2=--add-opens=java.base/java.lang=ALL-UNNAMED
wrapper.java.additional.3=--add-opens=java.base/java.io=ALL-UNNAMED
wrapper.java.additional.4=--add-opens=java.base/java.security.cert=ALL-UNNAMED
wrapper.java.additional.5=--add-opens=java.base/java.util=ALL-UNNAMED
wrapper.java.additional.6=--add-opens=java.base/jdk.internal.misc=ALL-UNNAMED
#wrapper.java.additional.6=-Xdebug
#wrapper.java.additional.7=-Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=*:8000
wrapper.java.additional.7=--add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED

# Initial Java Heap Size (in MB)
wrapper.java.initmemory=1024

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