如何使用dbus / bluez在python中获取当前的MTU

Question

有没有办法使用dbus bluez在python中获得当前客户端连接的MTU？

如果我观看btmon ，则在连接后可以看到值（503）：

# btmon | grep MTU
  ATT: Exchange MTU Request (0x02) len 2
    Client RX MTU: 517
  ATT: Exchange MTU Response (0x03) len 2
    Server RX MTU: 517
  ATT: Exchange MTU Request (0x02) len 2
    Client RX MTU: 503
  ATT: Exchange MTU Response (0x03) len 2
    Server RX MTU: 517

但是在dbus.bluez api中似乎没有此值的句柄

有任何想法吗？

Answer 1

Bluez不在dbus api上公开MTU大小。 但是，此信息在options参数的Read，Write等回调中给出。

        Methods     array{byte} ReadValue(dict options)

        Issues a request to read the value of the
        characteristic and returns the value if the
        operation was successful.

        Possible options: "offset": uint16 offset
                  "mtu": Exchanged MTU (Server only)
                  "device": Object Device (Server only)