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MQTT Transmission needs to be modified to point to the MQTT Server (MQTT Distributor) in order to get data into MQTT Engine.  To do so, browse to Ignition Edge MQTT with a web browser.  Then click 'Configure' at the top, log in, and select MQTT Transmission 'Settings' on the left panel near the bottom.  Then select the 'Servers' tab.  Finally, click the 'edit' button to the right of the 'Chariot SCADA' definition as shown below.

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At this point, modify the URL to point to the Central Ignition Gateway's IP address.  For example, if you central Ignition gateway is at 10.10.10.123, set the URL to tcp://10.10.10.123:1883.  Then save your settings.

Image ModifiedNow select 'Sets' at the top and click the 'edit' button next to the 'Default' Server Set as shown below.

Image ModifiedNow set the 'Primary Host ID' to the same ASCII string that was set in MQTT Engine previously as shown below and save the changes.

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Step 5: Create Edge Tags

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At this point we must launch Ignition Designer to create some tags to send to MQTT Engine using the MQTT protocol.  Launch Designer from Ignition Edge MQTT as shown below.

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Below shows the Ignition Designer.  Expand the 'Tag Browser' pane to get a better look.  Note the 'All Providers/edge/Edge Nodes' folder.  This is where we will add some specific folders and tags to work with the 'Default Transmitter' of MQTT Transmission.

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• Under the 'Edge Node' folder, create a new folder called 'Group 1'
• Under the 'Group 1' folder, create a new folder called 'Edge Node 1'
• Under the 'Edge Node 1', create a new folder called 'Device 1'
• Under the 'Device 1' folder, create a new Memory Tag as shown below.

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When done with the steps above, you should have a folder/tag structure as shown below.

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Note additional tags could be added to the 'Device 1' folder as well.  These could be OPC tags, UDTs, or other types of tags.  Also, additional folders could be added below this level as well.  The structure of the 'default transmitter' requires that the first three folder levels represent the Sparkplug Group ID, Edge Node ID, and Device ID respectively.

At this point, we can start the Transmitter by writing to the 'Transmission Control/Refresh' boolean tag.  Writing to this tag tells MQTT Transmission to rescan the entire tag tree, detect the folders and tags present, and then begin publishing Sparkplug messages to the MQTT Server.  The location of the tag to write to is shown below.

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Step 6: Verify MQTT Transmission is Connected

Open the Ignition Edge MQTT Web UI and browse to 'Configure → MQTT Transmission → Settings → Servers' and verify the connected status shows '1 of 1'.  If it does not, double check the firewall and antivirus settings on the Central Ignition Gateway and ensure port 1883 is open.

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Step 7: Verify Data Flowing into MQTT Engine

With MQTT Transmission now connected, open Ignition Designer on the Central Ignition Gateway.  Expand the Tag Browser and look expand the folder tree as shown below.  You should see the 'My Tag' tag published from the Ignition Edge MQTT Edge Node.

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