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- Communication protocol "MQTT Client Protocol".
- Polling parameters on the Time parameters tab - recommended value is Delay=0.
- Station address: the The station address corresponds to the Topic field in the PUBLISH message received from the MQTT server. The address can be a specific Topic, a regular expression, a # character representing all Topics, or a topic .* representing all Topics that are not suitable for covered by other stations. The processing priority is as follows
:Kotva prio_processing prio_processing - If there is a station with address # on the line, all messages are directed to its I/O tags and no further search is performed.
- Otherwise, all other stations on the line are searched (except the .* address). If the Topic matches the address of a station, the message is directed to that station, and no further search is performed.
- Otherwise, all other stations on the line are searched (except the .* address), and their address is evaluated as a regular expression. If the Topic matches the station address, the message is directed to that station and no further search is performed.
Stations are searched in descending order (by station address), so more specific terms go first (e.g., status/battery before status/batt.*) - Finally, if there is a station with a .* address, the message is addressed to it.
- Polling parameters on the Time parameters tab - recommended value is Delay=0.
Note: for For a SparkPlug MQTT server, Topic has the form 'namespace/group_id/message_type/edge_node_id/[device_id]', where message_type indicates the message type (e.g., DDATA, DBIRTH, DDEATH).
If Payload Type = Sparkplug Host: A regular expression (e.g., spBv1.0/Sparkplug Devices/.*/MyDevice/Sensor2) can be used instead of message_type to cover all message types.
If Payload Type=Sparkplug, it It is possible to omit the namespace and message_type parts and write the Topic in the abbreviated form 'group_id/edge_node_id/[device_id]' (e.g., Sparkplug Devices/MyDevice/Sensor2).
If Payload Type = Sparkplug Edge Node: One station on the line should correspond to the Edge Node; its address must be in the form group/node (e.g., myGroup/myNode). There may be other stations corresponding to the Device/Sensor on the line, their addresses must be in the form group/node/device (e.g., myGroup/myNode/myDevice1), where group/node is the same as the address of the station corresponding to the Edge Node. According to the Sparkplug standard, these Device/Sensor stations belong to the corresponding Edge Node station (are its substations).
Note: If the station address is in abbreviated form, commands (DCMD, NCMD) are not processed for it. If it is in the form of a regular expression ('namespace/group_id/.*/edge_node_id/[device_id]'), the station also processes commands (including the command sent by the D2000 KOM process if Send Node Control/Rebirth=YES). Therefore, we recommend specifying the station address in abbreviated form. If it is also necessary to process commands (from other Host Applications), then create another station with an address in the form of a regular expression (e.g. spBv1.0/Sparkplug Devices/DCMD/MyDevice).Kotva komunikacna_stanica_pozn komunikacna_stanica_pozn
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