最終更新:2022-08-15 (月) 14:45:47 (40d)  

Bluetooth Classic/ベースバンド/パケット/ペイロード/ヘッダ

長さ

  • The payload header is one or two bytes long.
    • Basic rate packets in segments one and two have a 1-byte payload header
    • Basic Rate packets in segments three and four and all Enhanced Data Rate packets have a 2-byte payload header.

フィールド

  • The payload header specifies the
    • logical link (2-bit LLID indication)
    • controls the flow on the logical channels (1-bit FLOW indication)
    • a payload length indicator (5 bits and 10 bits for 1-byte and 2-byte payload headers, respectively)
  • In the case of a 2-byte payload header, the length indicator is extended by five bits into the next byte.

LLID

FLOW

  • L2CAPレベルのフローコントロールで使う

LENGTH

BR single Slot ACL Packet

  • LSBから
    ビット215
    フィールドLLIDFLOWLENGTH