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The attached ZIP contains a configuration of two lines and four stations with the MQTT Sparkplug B protocol. Both lines connect (alternatively) to the servers 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 line parameter Sparkplug Host ID is set to "D2000komHA" (The Host application with this name is considered primary). The line L.MQTT_MOSQUITTO_EN connects alternately to the servers test.mosquitto.org and localhost until it finds a connected Primary Host Application.

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.
The line parameter Sparkplug Host ID is set to "D2000komHA" (this is the Host application identification).

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).