It seems like the iOS port waits for the server SSDP NOTIFY and doesn't send any discovery packet.
Some DLNA/UPnP server are configured to notify every 5-10 minutes or so if they don't receive any M-SEARCH request, and so it takes too long for VLC iOS to discover them.
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I have 2 DLNA servers on my LAN (the first one with a very low advertising interval -20 seconds-, the second (mine) with a longer interval).
I think the second one is not actively discoverd because of that commit.
EDIT: I excluded other routing problems because the AcePlayer app launch a M-SEARCH every single time so it detect both servers as soon as they respond to the SSDP search (I checked with pcap).
ok, the reason for the slow discovery is a slightly off-standard M-SEARCH request sent by the app (which seems to confuse some servers) as well as the fact that we don't send any NOTIFY signal at all. Meh, that's bad.