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NameData TypeDescription
Command Latency (ms)LongThe amount of time for a test MQTT command message to be sent and received back by the MQTT Client 
Enable Latency CheckBooleanWriteable tag to enable command latency checking for each MQTT Client
MQTT Client IDStringThe Client ID for the MQTT Client
Offline DateTimeDateTimeThe last time at which the MQTT Client successfully disconnected from the MQTT Server
OnlineBooleanA read-only tag showing the connection status of the MQTT Client
OnlineDateTimeDateTimeThe last time at which the MQTT Client successfully connected to the MQTT Server
Primary Host IDStringThe Primary Host ID configured for this MQTT Client
Target Server URLStringThe URL of the target MQTT Server to connect to


History Store

For each History Store, a folder will be created with the name of the History Store

NameData TypeDescription
Disk UsedLong

Created if the History Store type is Disk_Backed and shows the memory used since last module restart. This parameter will never go to zero for the following reasons:

  • The initial config of the DB will contain empty seeded tables based on the number of edge nodes and devices (table per edge node and per device) and at least one metadata table.

  • Flushed rows are marked for deletion and will actually be deleted from the DB on its internal schedule. This is to minimize the writes on a flash/SSD drive.

Memory UsedLongCreated if the History Store type is In_Memory and shows the memory used since last module restart


For Under each of the History Store folders, for each Transmitter, a tag tree will be created with the tag path of HistoryStoreName > GroupID > EdgeID  and/or > DeviceID

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