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The control extension carried device-state updates in two wire forms: a full snapshot on subscribe and Added/Updated/Removed deltas thereafter. At realistic USB device counts the delta path saves no measurable bandwidth and matches the snapshot's hotplug latency on the same socket, so the bookkeeping (sequence field on every frame, lastSeq+1 jump check, Subscribe sequence-stability retry loop, applyControlDelta) was pure ceremony. Every broadcast now emits controlFrameDeviceSnapshot with the full device list; clients overwrite their remote map from each snapshot. controlFrame loses its Sequence field, shrinking the wire header from 12 to 4 bytes. BroadcastIfChanged uses maps.EqualFunc with the existing deviceInfoV2Equal to skip no-op broadcasts.
sing-box
The universal proxy platform.
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Copyright (C) 2022 by nekohasekai <contact-sagernet@sekai.icu>
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