How To Fix /IWXBE/CORE126 - MQTT channel '&3' acknowledged the QOS '&1' event '&2'

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWXBE/CORE -

• Message number: 126

• Message text: MQTT channel '&3' acknowledged the QOS '&1' event '&2'

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWXBE/CORE126 - MQTT channel '&3' acknowledged the QOS '&1' event '&2' ?

  The SAP error message /IWXBE/CORE126 related to MQTT (Message Queuing Telemetry Transport) typically indicates an issue with the Quality of Service (QoS) level for a message being processed in the MQTT channel. The message format suggests that the MQTT channel acknowledged a specific QoS level for a particular event, but there may be underlying issues that need to be addressed.
  Cause:
  
  QoS Level Mismatch: The QoS level specified in the message may not match the expected level for the MQTT channel. MQTT supports three QoS levels (0, 1, and 2), and if there is a mismatch, it can lead to this error.
  Channel Configuration: The MQTT channel may not be configured correctly, leading to issues in message acknowledgment.
  Network Issues: Temporary network issues can cause problems with message delivery and acknowledgment.
  Broker Configuration: The MQTT broker may have specific configurations that affect how messages are acknowledged, which could lead to this error.
  
  Solution:
  
  Check QoS Settings: Verify the QoS settings in both the SAP system and the MQTT broker. Ensure that they are compatible and correctly configured.
  Review Channel Configuration: Check the configuration of the MQTT channel in SAP. Ensure that all parameters are set correctly, including the QoS level.
  Monitor Network Stability: Ensure that the network connection between the SAP system and the MQTT broker is stable. Look for any intermittent connectivity issues.
  Broker Logs: Review the logs of the MQTT broker for any errors or warnings that might provide additional context for the issue.
  Update SAP Notes: Check for any relevant SAP Notes or updates that might address known issues with MQTT integration.
  Testing: Conduct tests by sending messages with different QoS levels to see if the issue persists across all levels or is specific to one.
  
  Related Information:
  
  MQTT Protocol: Understanding the MQTT protocol and its QoS levels can help in troubleshooting. QoS 0 is "At most once," QoS 1 is "At least once," and QoS 2 is "Exactly once."
  SAP Documentation: Refer to SAP documentation for specific details on configuring MQTT channels and handling errors.
  Community Forums: Check SAP community forums or other technical forums for similar issues and solutions shared by other users.
  
  If the problem persists after trying the above solutions, consider reaching out to SAP support for further assistance.