Shelly Discovery Mechanism

[baal86]

How does the discovery of the emulated shelly work? "Real" shellys appararently use mdns but I don't see anything in the source that would do any kind of discovery. I only see an UDP socket being created. How do the B2500s find the Shelly from that?

[muhkuhgh]

Here stood mostly AI-nonsense that is of no help for no one. I beg for pardon, it was probably a too long day in the sun.

[tomquist]

Unfortunately, Perplexity is completely wrong here. The Marstek devices don't use mDNS. They broadcast all their UDP requests into the network and the first device that answers to the request wins.

[muhkuhgh]

But the trick to get you talking worked 😜
Seriously: I was already wondering, whether mDNS was doing anything in this case.. thanks for confirming it's not needed.

[baal86]

I was also scratching my head about that AI answer. CTRL+F mdns did not yield anything in the code..

@tomquist: So it just sends out the UDP request to the broadcast adress that I assume it infers from its own wifi config?? How primitive.. But that helps and answers a few of the other questions regarding network routing. Thanks.

Amazing work. I think you are single handedly making the B2500 the best home battery out there.

[tomquist]

Yes, very primitive. Even more primitive is how it calculates the broadcast address. It reads its own ip address, removes the last byte and replaces it with 255, so assuming the ip is 192.168.1.10 it broadcasts to 192.168.1.255, regardless of the subnet mask.

[baal86]

Ouch..