Sub_QoS

Description
This value indicates the level of guarantee for delivering messages between the MQTT subscriber and the broker.
You can configure this setting in
FactoryTalk Linx Gateway
 Configuration > MQTT > MQTT Client > Advance
.
The MQTT provides three levels of QoS (Quality of Service):
  • At most once
    The message is delivered at most once. There is no confirmation of delivery or retries.
  • At least once
    The message is delivered at least once. The publisher expects an acknowledgment of receipt from the broker. If the publisher does not receive an acknowledgment within a specified period, it will resend the message.
  • Exactly once
    The message is delivered exactly once, involving a four-step handshake process to achieve message delivery and acknowledgment.
Location
  • FactoryTalk Diagnostics Counter Monitor > System Diagnostics > localhost >
    FactoryTalk Linx Gateway
     MQTT Server > [Client ID] > [Dataset Name]
Value
  • Type: String
  • Source: This value is generated by the
    FactoryTalk Linx Gateway
     MQTT service.
  • Updates: This value updates when the configuration changes in the MQTT client.
  • Reset: This value resets when you reset the service or restart the computer.
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