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There are two configuration pages "History" and "Settings".
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The General Settings tab contains a single Main section.
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The configuration sections available are Main, TLS, Advanced and Advanced. RPC Client Connection
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See this document for TLS configuration: Configuring Secure MQTT Communication |
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Optional MQTT client ID to use. If specified this will be used in the MQTT Transmission connect packet when connecting to the server. If left blank, a random client ID will be create of the form 'IgnitionTargetMT-xxxxxxxx-xxxx-xxxx'.
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Caution: MQTT Clients IDs must be unique and if two clients attempt to connect with the same client ID, one will be forcefully disconnected from the server to allow the other client to connect. |
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If the server does not receive, at minimum, a PINGREQ message from a client within 1.5 times the Keep Alive, it will terminate the connection and send the client's LWT if it has been defined.
For MQTT Transmission, this is an DEATH message.
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This tab provides a list of the certificate or private key files if loaded and available for TLS configuration.
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All certificate or private keys must be in PEM format. If using modules pre 4.0.9, any private key must also be in RSA PKCS1 format. If using modules 4.0.9 or greater, any private key must also be in either RSA PKCS1 or PKCS8 format. |
The Certificates tab contains a single Main section.
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This section was added in release 4.0.18
Previously configuration for the Auto-reconnect RPC Client property was under the Advanced section
The RPC MQTT Client is used for MQTT publishing from Transmission using Ignition Python scripts
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This tab provides a list of the certificate or private key files if loaded and available for TLS configuration.
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All certificate or private keys must be in PEM format. If using modules pre 4.0.9, any private key must also be in RSA PKCS1 format. If using modules 4.0.9 or greater, any private key must also be in either RSA PKCS1 or PKCS8 format. |
The Certificates
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The Sets tab contains a list of server sets. Each set represents a logical grouping of MQTT servers. When a set is referenced by a Transmitter configuration, a single connection to one of the servers in the set will be maintained. The other servers will act as failover in the case that a connection with the first is lost. Server sets cannot have common elements meaning that a single MQTT server cannot be in more than one set.
The Sets tab contains a single Main section.
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The Sets tab contains a list of server sets. Each set represents a logical grouping of MQTT servers. When a set is referenced by a Transmitter configuration, a single connection to one of the servers in the set will be maintained. The other servers will act as failover in the case that a connection with the first is lost. Server sets cannot have common elements meaning that a single MQTT server cannot be in more than one set.
The Sets tab contains a single Main section.
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Transmitters are the agents within MQTT Transmission that monitor tags, convert them to Sparkplug Messages, and publish them to an MQTT Server. Each transmitter is configured with a server Set and will attempt to maintain an MQTT client connection with one server in that Set at all times.
Transmitters will monitor tags from a specific Tag Provider and, optionally, a specific Tag Path. If the tag folder hierarchy has been constructed as Group ID, Edge Node ID, and Device ID, then these will automatically be used when building up the MQTT message payload that will represent the Tags as follows:
[TagProvider]<TagPath>/<GroupID>/<EdgeNodeID>/<DeviceID>
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Review the MQTT Transmitters and Tag Trees describing how Transmitter configurations interact with Ignition tag trees |
If your tag folder hierarchy does not conform to this structure, you can explicitly define these required elements under theSparkPlug Settings section and the elements will be prepended to your tag string.
The configuration sections available are Tag Settings, Command Settings, History Settings, Alarm
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Transmitters are the agents within MQTT Transmission that monitor tags, convert them to Sparkplug Messages, and publish them to an MQTT Server. Each transmitter is configured with a server Set and will attempt to maintain an MQTT client connection with one server in that Set at all times.
Transmitters will monitor tags from a specific Tag Provider and, optionally, a specific Tag Path. If the tag folder hierarchy has been constructed as Group ID, Edge Node ID, and Device ID, then these will automatically be used when building up the MQTT message payload that will represent the Tags as follows:
[TagProvider]<TagPath>/<GroupID>/<EdgeNodeID>/<DeviceID>
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Review the MQTT Transmitters and Tag Trees describing how Transmitter configurations interact with Ignition tag trees |
If your tag folder hierarchy does not conform to this structure, you can explicitly define these required elements under theSparkPlug Settings section and the elements will be prepended to your tag string.The configuration sections available are Tag Settings, Command Settings, History Settings, Sparkplug Settings and Advanced Settings.
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Available in MQTT Transmission 4.0.16 and newer |
When enabled and alarms are enabled on tags, the contents of the triggered alarms will be transmitted via Sparkplug to MQTT Engine and will be inserted into the Ignition Alarm Journal on the server where MQTT Engine is installed.
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This is not full alarm support as the ability to clear or ack an alarm from MQTT Engine is not currently supported |
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By default the filtered properties list contains:
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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 |
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Within MQTT Transmission, a record is a collection of tags under an Ignition folder which are treated as a single entity and published on demand. They are usually used for, but not restricted to, sending flow computer records such as events, alarms and history data.
Each record will have an associated boolean tag that will trigger the record publish. The location of this boolean tag is defined in the Record - Advanced Settings section.
Records are published via an MQTT client using a Sparkplug-like format such as spBv1.0/Group/NRECORD/Edge or spBv1.0/Group/DRECORD/Edge/Device
The configuration sections available are Tag Settings, Sparkplug Settings and Advanced Settings.
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;scaleFactor;scaleMode;scaledHigh;scaledLow;tagGroup;valueSource;expression;expressionType;ConfiguredTagPath;eventScripts;readPermissions;writePermissions;eventScripts;parentEnabled;sourceTagPath |
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Within MQTT Transmission, a record is a collection of tags under an Ignition folder which are treated as a single entity and published on demand. They are usually used for, but not restricted to, sending flow computer records such as events, alarms and history data.
Each record will have an associated boolean tag that will trigger the record publish. The location of this boolean tag is defined in the Record - Advanced Settings section.
Records are published via an MQTT client using a Sparkplug-like format such as spBv1.0/Group/NRECORD/Edge or spBv1.0/Group/DRECORD/Edge/Device
The configuration sections available are Tag Settings, Sparkplug Settings, Records Signature and Advanced Settings.
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To publish records, MQTT Transmission uses a configured Transmitter. The properties entered into the Sparkplug settings for Group ID, Edge ID and Device ID (optional) must match an existing Sparkplug Edge Node based on a Transmitter and tag tree configuration. |
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From version 4.0.19 added support for digital signatures/hashing of Records that are generated by MQTT Transmission so that they can be verified in the MQTT Recorder database. |
To publish records, MQTT Transmission uses a configured Transmitter. The properties entered into the Sparkplug settings for Group ID, Edge ID and Device ID (optional) must match an existing Sparkplug Edge Node based on a Transmitter and tag tree configuration.
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The "History" page allows for the configuration of MQTT Transmission History Stores. In the event that a Transmitter loses its connection with the MQTT Server and is unable to reconnect, a History Store (if enabled) will store all messages corresponding to change events on the monitored tags. Once a connection with an MQTT server is reestablished the History Store will publish the stored messages with a flag set to indicate that the messages are "historical" to prevent confusion with live data values.
The History tab contains a single Main section.
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The "History" page allows for the configuration of MQTT Transmission History Stores.
When a Transmitter is configured to use an MQTT Transmission History Store, data is written to the History Store once MQTT Transmission has determined that there is a connection failure. Once a connection with an MQTT server is re-established the History Store will publish the stored messages with a flag set to indicate that the messages are "historical" to prevent confusion with live data values. Determination of a connection failure can be up to 1.5 times the configured keep alive. and, as such, any data published during this time can be lost.
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From release 4.0.17, in order to cover data loss during a keep alive timeout scenario, the MQTT Transmission History Store includes a Rolling History Buffer that can be configured in the Advanced Properties configuration section. When the Rolling History Buffer is enabled, all tag changes will be written to the History Store regardless of connection status. |
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From release 4.0.19, major improvements have been made to the disk-backed History Store. Details on configuring pre 4.0.19 modules can be found here. |
The History tab contains a Main section and an Advanced section.
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If using a large tag capacity it is highly recommended to test the system under load in a non-production environment on similar hardware and software that will be used in production. During testing is also important to get the system into a state where the store and forward cache becomes full before beginning to flush. This will ensure that the system is sized appropriately when deployed into a production environment. There are a number of factors involved in determining how large the tag capacity can be including but not limited to system resources such as CPU, RAM (especially when using 'In-Memory'), Disk IOPS (if using 'Disk-Backed'), the nominal tag change rate (e.g. number of tags changing per second in the system), the flush rate, bandwidth availability, whether flushing in order vs asynchronously, etc. Because of the complex interactions of these variables it is highly recommended to test in a controlled environment. Generally any capacity over 2,000,000 is considered large and should be tested before deploying to production. Review Determining the settings for an MQTT Transmission History Store |