We recommend you configure the Smart Battery Sense, or BMV first and only then add one or more chargers to that network. For more information, see the Smart Battery Sense manual.
Open VictronConnect, connect the device, navigate to Settings and select VE.Smart Networking.
Click Create Network and enter a name.
Click Save and wait for the 'OK' to show up.
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Go back and navigate to the compatible charger of your choice, then click Settings followed by VE.Smart Networking followed by Join Existing.
Now select the network which you created in the previous step.
Wait for the 'OK' to show.
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When everything is working OK, you will be able to see that the VE.Smart Networking page of the networked charger is receiving data:
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Also the network icon 
will be shown on the main page:
Clicking on that icon will show the network status.
The current LED State will also blink every 4 seconds when a VE.Smart Network is configured and the charger is receiving data.