蓝牙：经典：L2CAP Shell

本文档介绍如何运行蓝牙经典 L2CAP 功能。 br l2cap 命令提供蓝牙经典 L2CAP Shell 命令。

命令

br l2cap 命令：

uart:~$ br l2cap
l2cap - [none]
Subcommands:
  register    : <psm> <mode: none, ret, fc, eret, stream> [hold_credit]
                [mode_optional] [extended_control]
  connect     : <psm> <mode: none, ret, fc, eret, stream> [hold_credit]
                [mode_optional] [extended_control]
  disconnect  : [none]
  send        : [number of packets] [length of packet(s)]
  credits     : [none]
  echo        : L2CAP BR ECHO commands
  connless    : L2CAP connectionless commands

br l2cap echo 命令：

uart:~$ br l2cap echo
echo - L2CAP BR ECHO commands
Subcommands:
  register    : [none]
  unregister  : [none]
  req         : <length of data>
  rsp         : <identifier> <length of data>

br l2cap connless 命令：

uart:~$ br l2cap connless
connless - L2CAP connectionless commands
Subcommands:
  register    : <psm> [sec level]
  unregister  : [none]
  send        : <psm> <length of data>

面向连接的 L2CAP

[服务器] 注册 L2CAP 服务器：

蓝牙协议栈初始化（ bt init ）后，可以调用 br l2cap register 注册 L2CAP 服务器。

uart:~$ br l2cap register 1001 none
L2CAP psm 4097 registered

[客户端] 创建 L2CAP 连接：

只有在建立 ACL 连接后才能使用该命令。

uart:~$ br l2cap connect 1001 none
L2CAP connection pending

已建立 L2CAP 连接：

uart:~$
Security changed: XX:XX:XX:XX:XX:XX level 2
Incoming BR/EDR conn 0x20004848
Channel 0x20000b18 connected
It is basic mode

向远端发送 L2CAP 数据：

uart:~$ br l2cap send
Rem 0

已收到 L2CAP 数据：

uart:~$
Incoming data channel 0x20000b18 len 200
00000000: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |........ ........|
00000010: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |........ ........|
00000020: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |........ ........|
00000030: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |........ ........|
00000040: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |........ ........|
00000050: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |........ ........|
00000060: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |........ ........|
00000070: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |........ ........|
00000080: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |........ ........|
00000090: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |........ ........|
000000A0: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |........ ........|
000000B0: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |........ ........|
000000C0: 00 00 00 00 00 00 00 00                          |........         |

断开 L2CAP 连接：

uart:~$ br l2cap disconnect

L2CAP 连接已断开：

Channel 0x20000b18 disconnected

L2CAP 回显

echo 子命令提供蓝牙经典中 L2CAP 回显请求和响应的功能。

只有在建立 ACL 连接后才能使用这些命令。

监听 L2CAP 回显请求和 L2CAP 回显响应：

uart:~$ br l2cap echo register

停止监听 L2CAP 回显请求和 L2CAP 回显响应：

uart:~$ br l2cap echo unregister

发送 L2CAP 回显请求：

uart:~$ br l2cap echo req 1

已收到回显请求：

Incoming ECHO REQ data identifier 4 len 1
00000000: 00                                               |.                |

发送 L2CAP 回显响应：

uart:~$ br l2cap echo rsp 4 1

已收到回显响应：

uart:~$
Incoming ECHO RSP data len 1
00000000: 00                                               |.                |

无连接 L2CAP

connless 子命令提供蓝牙经典中无连接 L2CAP 通信的功能，允许在不建立 L2CAP 连接的情况下传输数据包。

该子命令由 CONFIG_BT_L2CAP_CONNLESS 控制。

只有在建立 ACL 连接后才能使用这些命令。

监听无连接 L2CAP 数据包：

uart:~$ br l2cap connless register 1001
Register connectionless callbacks with PSM 0x1001

发送数据

uart:~$ br l2cap connless send 1001 1
Sending connectionless data with PSM 0x1001

已收到无连接数据：

Incoming connectionless data psm 0x1001 len 1
00000000: 00                                               |.                |