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| Keyword | Full name | Meaning | Unit | Default value | ||||||
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| Station Will Topic | 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). | ||||||||
| Station Will Payload | 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. | ||||||||
| Payload Type | The setting of message parsing (overriding the line parameter Payload Type):
| Default Text only JSON Sparkplug | Default | ||||||
| Time Field Name | If Payload Type=JSON, the name of the field with a timestamp - overriding the line parameter Time Field Name. | - | - | ||||||
| Time Mask | Mask for parsing a value in the field with a timestamp - overriding the line parameter Time Mask. Note: Whether the time is interpreted as local or UTC with a configured offset depends on the time station parameters settings. | - | - | ||||||
Sparkplug parameters | ||||||||||
| Send Node Control/Rebirth | 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. | YES/NO | YES | ||||||
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The attached ZIP contains the configuration of two lines and two stations with the MQTT protocol and the definition of the S.MqttTest scheme. Data written over one line is received over the other line. The functionality was verified against the Mosquitto broker installed locally on Windows, listening on TCP port 1883.
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The attached ZIP contains a configuration of two lines and four stations with the MQTT Sparkplug B protocol. Both connect (alternatively) to the servers test.mosquitto.org and localhost. The line L.MQTT_MOSQUITTO_EN (parent MQTT_MOSQUITTO_EN.KOM) is in Sparkplug Edge Node (data producer) mode, has two stations B.MQTT_MOSQUITTO_EN (Edge Node with address myGroup/myEdgeNode) and B.MQTT_MOSQUITTO_EN.Device1 (Device with address myGroup/myEdgeNode/myDevice1). These stations publish the values of the objects Hour, Min, Sec. The L.MQTT_MOSQUITTO_HA line (parent MQTT_MOSQUITTO_HA.KOM) is in Sparkplug Host mode (data consumer), has two stations B.MQTT_MOSQUITTO_HA (receiving data with the topic myGroup/myEdgeNode) and B.MQTT_MOSQUITTO_HA.Device1 (receiving data with the address myGroup/myEdgeNode/myDevice1). These stations receive object values published by I/O tags on Sparkplug Edge Node stations. Using the output I/O tags on Sparkplug Host stations (M.MQTT_MOSQUITTO_HA.Output1_Int32, M.MQTT_MOSQUITTO_HA.Output2_Float, and M.MQTT_MOSQUITTO_HA.Device1.Output1_Bool), it is possible to send DCMD and NCMD messages and write to the input I/O tags on Sparkplug Edge Node stations (M.MQTT_MOSQUITTO_EN1.Input1, M.MQTT_MOSQUITTO_EN1.Input2, and M.MQTT_MOSQUITTO_EN.Device1.Input1_Bool).
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You can read a blog about the MQTT protocol |
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