Editing OpenSimulator Internals/Code Map/LLUDP (section)

== Outgoing Packet Path ==

 SendPacket() / SendPacketData()

# Packets larger than MTU with variable blocks are split via packet.ToBytesMultiple() (CoarseLocationUpdate is exempt -- cannot be split)
# Zero-encoding applied if MSG_ZEROCODED flag is set on the packet
# Wrapped in an OutgoingPacket and either queued via udpClient.EnqueueOutgoing() or sent immediately via SendPacketFinal()

SendPacketFinal():
# Appends pending ACKs to plain reliable packets if there's room (up to 256, then flags MSG_APPENDED_ACKS)
# Assigns a new sequence number (unless this is a resend, which keeps its original data but sets MSG_RESENT)
# Calls SyncSend() -- actual socket write
# If the packet has no custom UnackedMethod, the buffer is freed immediately (fire-and-forget). Otherwise it's added to udpClient.NeedAcks awaiting acknowledgment

OutgoingPacketHandler() thread loop (runs continuously):
# Every 100ms: triggers HandleUnacked() checks (resend expired packets)
# Every 500ms (5 x 100ms): triggers SendAcks()
# Every 5000ms (10 x 500ms): triggers SendPing()
# Calls Scene.ForEachClient() with ClientOutgoingPacketHandler, which dequeues throttled outgoing packets per client
# Sleeps 100ms if no clients connected, 15ms if nothing was sent this round (matches typical OS tick granularity), otherwise loops immediately

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