pub const PUNCH_MAGIC: u32 = 0x4E505443;Expand description
Punch-probe magic (“NPTC”, network byte order). First byte 0x4E
collides with FMP’s prefix-version high-nibble check, so the UDP
transport silently filters packets carrying this magic to keep
post-adoption handshake logs clean. Defined at the top-level
discovery module so the UDP filter and the nostr submodule’s
punch sender share the same constant.