Decoder: BLE L2CAP

BLE L2CAP Hex Decoder

L2CAP multiplexes ATT/SMP/signaling traffic and provides segmentation/flow-control capabilities in BLE links.

Decode BLE L2CAP Data

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Raw Decode Output

Decoded Fields

Payload Hex: N/A

Payload ASCII: N/A

N/A

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About BLE L2CAP

BLE L2CAP is the adaptation layer between Link Layer and upper protocols. Channel ID decoding quickly reveals whether traffic is ATT, SMP, signaling, or dynamic channels.

L2CAP multiplexes ATT/SMP/signaling traffic and provides segmentation/flow-control capabilities in BLE links.

BLE L2CAP Header Structure

  • Length (2 bytes, little-endian): payload size.
  • Channel ID (2 bytes, little-endian): protocol/dynamic channel selector.
  • Payload: encapsulated ATT/SMP/signaling/application data.

Why Decode BLE L2CAP Packets

Decode BLE L2CAP headers including payload length, channel ID, and encapsulated upper protocol.