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What is the purpose of UDP port 7946?

The docs state you need to open “TCP and UDP port 7946 for communication among nodes”. I’m trying to set up a more exotic configuration where I’m using stunnel to tunnel traffic on 7946 through HTTPS to allow linking two nodes behind restrictive firewalls, but stunnel only (easily) works with TCP.

So would the swarm still work if UDP (but not TCP) 7946 was blocked?