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Will topic of the device. If this parameter is set and a message with the same topic is received, the station will go into a communication error (StHardErr) and the values of the I/O tags will be invalidated. In this way, it is possible to emulate the standard behavior that occurs when there is a communication error with the device (even if the communication between the D2000 Kom process and the MQTT broker is functional).

Content of the Will message. If this parameter is set and a message with the same topic as defined by the Station Will Topic parameter is received, the Payload must also be the same. If this parameter is an empty string, matching the topic with the Station Will Topic parameter is sufficient.
Note: this parameter was implemented due to MQTT brokers sending messages with the same Topic when connecting/disconnecting the device, the difference being only in the Payload.

The setting of message parsing (overriding of the line parameter Payload Type):

• Default - the line parameter Payload Type is respected
• Text only - the message is not parsed, it is assigned to the I/O tag with the address IN_TOPIC
• JSON - the message is parsed as JSON data. If there is an I/O tag with the address IN_TOPIC, the whole message will be assigned to it.
  If there are I/O tags with addresses JA=json_address, they will be populated with the appropriate data from the JSON message. If no such addresses exist in the message, the I/O tags will be invalidated.
• Sparkplug - the message is parsed as Sparkplug B payload (binary coded).

Sparkplug parameters

At the start of the D2000 KOM process, a command (NCMD or DCMD) with the metric 'Node Control/Rebirth' is sent to the SparkPlug station. The response should be a message (NBIRTH/DBIRTH) with all current metrics.