使用btool连接从机，连接上以后使用discovery char by uuid 之后，连接就断开了，原因是超时。为什么？
下面是收到的数据
[1] : <Rx> - 01:24:01.859
-Type : 0x04 (Event)
-EventCode : 0xFF (HCI_LE_ExtEvent)
-Data Length : 0x06 (6) bytes(s)
Event : 0x0509 (ATT_ReadByTypeRsp)
Status : 0x14 (Can't Perform Function When Not In A Connection)
ConnHandle : 0x0000 (0)
PduLen : 0x00 (0)
Dump(Rx):
04 FF 06 09 05 14 00 00 00
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[2] : <Info> - 01:24:01.875
Device Disconnected
Handle = 0x0000
Addr Type = 0x00 (Public)
BDAddr = 88:33:14:DD:8A:63
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[3] : <Rx> - 01:24:01.875
-Type : 0x04 (Event)
-EventCode : 0xFF (HCI_LE_ExtEvent)
-Data Length : 0x06 (6) bytes(s)
Event : 0x0606 (GAP_TerminateLink)
Status : 0x00 (Success)
ConnHandle : 0x0000 (0)
Reason : 0x08 (Supervisor Timeout)
Dump(Rx):
04 FF 06 06 06 00 00 00 08
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