That’s the first I’ve heard of this, and I try to read virtually everything that’s posted on the forum.
The simplest way to implement a hub topology is to use MQTT and Node-Red.
The individual devices connect to the hub that’s running Node-Red and which uses the Blynk plug-in to talk to the Blynk server (either cloud or local).
Node-Red can have multiple Blynk devices (each with their own Auth code) and you can feed data from your physical nodes on your network to the appropriate Blynk device and vice-versa by routing the MQTT messages to the appropriate place.
This actually sounds more complex than it is, and may make more sense if you read this:
The only thing that doesn’t work as designed with this setup is the online/offline status of your devices. Because it’d the central hub that’s connected to Blynk, if the hub is running and connected to the Blynk server then Blynk will think that all the devices that have their own Auth codes are also online. It’s easy enough to get around this though, by sending an MQTT heartbeat message from each of the network devices and using an LED widget to indicate the status of each device if the heartbeat stops.
Pete.