class Matter::Transport::MessageCounter

• Matter::Transport::MessageCounter
• Reference
• Object

Overview

Manages message IDs and deduplication

Matter protocol uses 32-bit message counters for:

• Ensuring message ordering
• Detecting duplicate messages
• Replay attack protection

Defined in:

matter/transport/message_counter.cr

Constant Summary

WINDOW_SIZE = 64

Rolling window size for duplicate detection (spec recommends at least 32)

Constructors

• .new(counter : UInt32 = 0_u32)

Instance Method Summary

• #check(message_id : UInt32) : CheckResult

  Check whether a received message ID is accepted, a duplicate, or stale.

• #counter : UInt32
• #mark_received(message_id : UInt32) : Nil

  Mark a message ID as received (for testing/manual tracking)

• #next : UInt32

  Get next message ID to send

• #reset(value : UInt32 = 0_u32) : Nil

  Reset counter (used when establishing new session)

• #valid?(message_id : UInt32) : Bool

  Check if a received message ID is valid (not a duplicate or replay) Returns true if message should be accepted

Constructor Detail

Instance Method Detail