Bluez不能永久连接到蓝牙LE遥控器“未实现的功能(38)”
Bluez不能永久连接到蓝牙LE遥控器“未实现的功能(38)”
提问于 2021-06-30 22:03:22
我有一个新的恶棍形象：
Linux立体声5.10.17+ #1414星期五4月30日13:16:27 BST2021 armv6l GNU/Linux
我确实把布吕兹更新到了bluez 5.52。已经很有趣的是，我的/var/log/syslog中有以下条目
6月30日23:15:09立体定向bluetoothd557:蓝牙守护进程5.50
这似乎表明，以前安装的5.50版本仍然存在。
我在其他机器上做了同样的设置，然后我就可以让它开始工作了，但这一次似乎有问题。
现在，使用蓝牙can，我可以看到我的设备并对它进行配对，但是连接立即断开：
[bluetooth]# trust 84:EB:18:0C:92:0F
Changing 84:EB:18:0C:92:0F trust succeeded
[bluetooth]# pair 84:EB:18:0C:92:0F
Attempting to pair with 84:EB:18:0C:92:0F
[CHG] Device 84:EB:18:0C:92:0F Connected: yes
Failed to pair: org.bluez.Error.AuthenticationFailed
[CHG] Device 84:EB:18:0C:92:0F Connected: no
[bluetooth]# connect 84:EB:18:0C:92:0F
Attempting to connect to 84:EB:18:0C:92:0F
[CHG] Device 84:EB:18:0C:92:0F Connected: yes
Failed to connect: org.bluez.Error.Failed
[CHG] Device 84:EB:18:0C:92:0F Connected: no当我签入日志时，我确实看到了以下内容：
Jun 30 23:15:53 stereopida bluetoothd[567]: src/device.c:bonding_request_new() Requesting bonding for 84:EB:18:0C:92:0F
Jun 30 23:15:53 stereopida bluetoothd[567]: src/agent.c:agent_ref() 0x7b62b0: ref=3
Jun 30 23:15:53 stereopida bluetoothd[567]: src/agent.c:agent_unref() 0x7b62b0: ref=2
Jun 30 23:15:53 stereopida bluetoothd[567]: src/adapter.c:suspend_discovery()
Jun 30 23:15:53 stereopida bluetoothd[567]: src/adapter.c:adapter_bonding_attempt() hci0 bdaddr 84:EB:18:0C:92:0F type 1 io_cap 0x04
Jun 30 23:15:55 stereopida bluetoothd[567]: src/adapter.c:connected_callback() hci0 device 84:EB:18:0C:92:0F connected eir_len 13
Jun 30 23:15:55 stereopida bluetoothd[567]: src/adapter.c:pair_device_complete() Failed (0x03)
Jun 30 23:15:55 stereopida bluetoothd[567]: src/adapter.c:bonding_attempt_complete() hci0 bdaddr 84:EB:18:0C:92:0F type 1 status 0x3
Jun 30 23:15:55 stereopida bluetoothd[567]: src/device.c:device_bonding_complete() bonding 0x7ba428 status 0x03
Jun 30 23:15:55 stereopida bluetoothd[567]: src/device.c:device_bonding_failed() status 3
Jun 30 23:15:55 stereopida bluetoothd[567]: src/agent.c:agent_unref() 0x7b62b0: ref=1
Jun 30 23:15:55 stereopida bluetoothd[567]: src/adapter.c:resume_discovery()
Jun 30 23:15:55 stereopida bluetoothd[567]: src/adapter.c:dev_disconnected() Device 84:EB:18:0C:92:0F disconnected, reason 0
Jun 30 23:15:55 stereopida bluetoothd[567]: src/adapter.c:adapter_remove_connection()
Jun 30 23:15:55 stereopida bluetoothd[567]: plugins/policy.c:disconnect_cb() reason 0
Jun 30 23:15:55 stereopida bluetoothd[567]: src/adapter.c:bonding_attempt_complete() hci0 bdaddr 84:EB:18:0C:92:0F type 1 status 0xe
Jun 30 23:15:55 stereopida bluetoothd[567]: src/device.c:device_bonding_complete() bonding (nil) status 0x0e
Jun 30 23:15:55 stereopida bluetoothd[567]: src/device.c:device_bonding_failed() status 14
Jun 30 23:15:55 stereopida bluetoothd[567]: src/adapter.c:resume_discovery()
Jun 30 23:16:04 stereopida bluetoothd[567]: src/device.c:device_connect_le() Connection attempt to: 84:EB:18:0C:92:0F
Jun 30 23:16:08 stereopida systemd[1]: systemd-hostnamed.service: Succeeded.
Jun 30 23:16:09 stereopida bluetoothd[567]: src/adapter.c:connected_callback() hci0 device 84:EB:18:0C:92:0F connected eir_len 13
Jun 30 23:16:09 stereopida bluetoothd[567]: src/device.c:att_connect_cb() connect error: Function not implemented (38)
Jun 30 23:16:09 stereopida bluetoothd[567]: src/adapter.c:dev_disconnected() Device 84:EB:18:0C:92:0F disconnected, reason 0
Jun 30 23:16:09 stereopida bluetoothd[567]: src/adapter.c:adapter_remove_connection()
Jun 30 23:16:09 stereopida bluetoothd[567]: plugins/policy.c:disconnect_cb() reason 0
Jun 30 23:16:09 stereopida bluetoothd[567]: src/adapter.c:bonding_attempt_complete() hci0 bdaddr 84:EB:18:0C:92:0F type 1 status 0xe
Jun 30 23:16:09 stereopida bluetoothd[567]: src/device.c:device_bonding_complete() bonding (nil) status 0x0e
Jun 30 23:16:09 stereopida bluetoothd[567]: src/device.c:device_bonding_failed() status 14
Jun 30 23:16:09 stereopida bluetoothd[567]: src/adapter.c:resume_discovery()
Jun 30 23:16:15 stereopida bluetoothd[567]: src/agent.c:agent_disconnect() Agent :1.20 disconnected
Jun 30 23:16:15 stereopida bluetoothd[567]: src/agent.c:agent_destroy() agent :1.20
Jun 30 23:16:15 stereopida bluetoothd[567]: src/agent.c:agent_unref() 0x7b62b0: ref=0在我的/etc/bluetooth/main.conf文件中，我确实做了以下更改：
DiscoverableTimeout = 0
PairableTimeout = 0
ControllerMode = le
Privacy = off我bluetooth.service中的bluetooth.service部分确实更改为以下内容：
ExecStart=/usr/lib/bluetooth/bluetoothd --noplugin=sap -E 加特工具
sudo gatttool -b 84:EB:18:0C:92:0F --interactive
[84:EB:18:0C:92:0F][LE]> connect
Attempting to connect to 84:EB:18:0C:92:0F
Error: connect error: Function not implemented (38)贝特蒙
当我使用Gattool连接时，这是sudo btmon的输出
sudo btmon
Bluetooth monitor ver 5.52
= Note: Linux version 5.10.17+ (armv6l) 0.137356
= Note: Bluetooth subsystem version 2.22 0.137373
= New Index: B8:27:EB:BD:CA:1B (Primary,UART,hci0) [hci0] 0.137378
= Open Index: B8:27:EB:BD:CA:1B [hci0] 0.137386
= Index Info: B8:27:EB:BD:CA:1B (Broadcom Corporation) [hci0] 0.137390
@ MGMT Open: bluetoothd (privileged) version 1.18 {0x0001} 0.137396
@ MGMT Open: btmon (privileged) version 1.18 {0x0002} 0.139895
< HCI Command: LE Set Scan Parameters (0x08|0x000b) plen 7 #1 [hci0] 9.320332
Type: Passive (0x00)
Interval: 60.000 msec (0x0060)
Window: 60.000 msec (0x0060)
Own address type: Public (0x00)
Filter policy: Ignore not in white list (0x01)
> HCI Event: Command Complete (0x0e) plen 4 #2 [hci0] 9.321695
LE Set Scan Parameters (0x08|0x000b) ncmd 1
Status: Success (0x00)
< HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2 #3 [hci0] 9.321835
Scanning: Enabled (0x01)
Filter duplicates: Enabled (0x01)
> HCI Event: Command Complete (0x0e) plen 4 #4 [hci0] 9.324626
LE Set Scan Enable (0x08|0x000c) ncmd 1
Status: Success (0x00)
> HCI Event: LE Meta Event (0x3e) plen 25 #5 [hci0] 11.847196
LE Advertising Report (0x02)
Num reports: 1
Event type: Connectable undirected - ADV_IND (0x00)
Address type: Public (0x00)
Address: 84:EB:18:0C:92:0F (Texas Instruments)
Data length: 13
Flags: 0x05
LE Limited Discoverable Mode
BR/EDR Not Supported
Appearance: Human Interface Device (0x03c0)
16-bit Service UUIDs (partial): 2 entries
Human Interface Device (0x1812)
Battery Service (0x180f)
RSSI: -72 dBm (0xb8)
< HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2 #6 [hci0] 11.847369
Scanning: Disabled (0x00)
Filter duplicates: Disabled (0x00)
> HCI Event: Command Complete (0x0e) plen 4 #7 [hci0] 11.851192
LE Set Scan Enable (0x08|0x000c) ncmd 1
Status: Success (0x00)
< HCI Command: LE Create Connection (0x08|0x000d) plen 25 #8 [hci0] 11.851310
Scan interval: 60.000 msec (0x0060)
Scan window: 60.000 msec (0x0060)
Filter policy: White list is not used (0x00)
Peer address type: Public (0x00)
Peer address: 84:EB:18:0C:92:0F (Texas Instruments)
Own address type: Public (0x00)
Min connection interval: 30.00 msec (0x0018)
Max connection interval: 50.00 msec (0x0028)
Connection latency: 0 (0x0000)
Supervision timeout: 420 msec (0x002a)
Min connection length: 0.000 msec (0x0000)
Max connection length: 0.000 msec (0x0000)
> HCI Event: Command Status (0x0f) plen 4 #9 [hci0] 11.852722
LE Create Connection (0x08|0x000d) ncmd 1
Status: Success (0x00)
> HCI Event: LE Meta Event (0x3e) plen 19 #10 [hci0] 11.869896
LE Connection Complete (0x01)
Status: Success (0x00)
Handle: 64
Role: Master (0x00)
Peer address type: Public (0x00)
Peer address: 84:EB:18:0C:92:0F (Texas Instruments)
Connection interval: 48.75 msec (0x0027)
Connection latency: 0 (0x0000)
Supervision timeout: 420 msec (0x002a)
Master clock accuracy: 0x00
@ MGMT Event: Device Connected (0x000b) plen 26 {0x0002} [hci0] 11.869988
LE Address: 84:EB:18:0C:92:0F (Texas Instruments)
Flags: 0x00000000
Data length: 13
Flags: 0x05
LE Limited Discoverable Mode
BR/EDR Not Supported
Appearance: Human Interface Device (0x03c0)
16-bit Service UUIDs (partial): 2 entries
Human Interface Device (0x1812)
Battery Service (0x180f)
@ MGMT Event: Device Connected (0x000b) plen 26 {0x0001} [hci0] 11.869988
LE Address: 84:EB:18:0C:92:0F (Texas Instruments)
Flags: 0x00000000
Data length: 13
Flags: 0x05
LE Limited Discoverable Mode
BR/EDR Not Supported
Appearance: Human Interface Device (0x03c0)
16-bit Service UUIDs (partial): 2 entries
Human Interface Device (0x1812)
Battery Service (0x180f)
< HCI Command: LE Read Remote Used Features (0x08|0x0016) plen 2 #11 [hci0] 11.870350
Handle: 64
> HCI Event: Command Status (0x0f) plen 4 #12 [hci0] 11.877612
LE Read Remote Used Features (0x08|0x0016) ncmd 1
Status: Success (0x00)
> HCI Event: LE Meta Event (0x3e) plen 12 #13 [hci0] 12.210580
LE Read Remote Used Features (0x04)
Status: Connection Failed to be Established (0x3e)
Handle: 64
Features: 0x1f 0x00 0x00 0x08 0x00 0x00 0x00 0x00
LE Encryption
Connection Parameter Request Procedure
Extended Reject Indication
Slave-initiated Features Exchange
LE Ping
Remote Public Key Validation
< HCI Command: Disconnect (0x01|0x0006) plen 3 #14 [hci0] 12.210756
Handle: 64
Reason: Remote User Terminated Connection (0x13)
> HCI Event: Disconnect Complete (0x05) plen 4 #15 [hci0] 12.214327
Status: Success (0x00)
Handle: 64
Reason: Connection Failed to be Established (0x3e)
@ MGMT Event: Device Disconnected (0x000c) plen 8 {0x0002} [hci0] 12.214426
LE Address: 84:EB:18:0C:92:0F (Texas Instruments)
Reason: Unspecified (0x00)
@ MGMT Event: Device Disconnected (0x000c) plen 8 {0x0001} [hci0] 12.214426
LE Address: 84:EB:18:0C:92:0F (Texas Instruments)
Reason: Unspecified (0x00)
> HCI Event: Command Status (0x0f) plen 4 #16 [hci0] 12.214351
Disconnect (0x01|0x0006) ncmd 1
Status: Invalid HCI Command Parameters (0x12)更新2:使用DBUS
我试图使用dbus-python-script进行连接，但得到了错误：
创建设备失败: org.bluez.Error.AuthenticationFailed
这是该尝试的btmon输出：
$ sudo btmon
Bluetooth monitor ver 5.52
= Note: Linux version 5.10.17+ (armv6l) 0.495323
= Note: Bluetooth subsystem version 2.22 0.495341
= New Index: B8:27:EB:BD:CA:1B (Primary,UART,hci0) [hci0] 0.495350
= Open Index: B8:27:EB:BD:CA:1B [hci0] 0.495355
= Index Info: B8:27:EB:BD:CA:1B (Broadcom Corporation) [hci0] 0.495361
@ MGMT Open: bluetoothd (privileged) version 1.18 {0x0001} 0.495370
@ MGMT Open: btmon (privileged) version 1.18 {0x0002} 0.495742
@ MGMT Command: Pair Device (0x0019) plen 8 {0x0001} [hci0] 7.479710
LE Address: 84:EB:18:0C:92:0F (Texas Instruments)
Capability: KeyboardDisplay (0x04)
< HCI Command: LE Set Scan Parameters (0x08|0x000b) plen 7 #1 [hci0] 7.482368
Type: Passive (0x00)
Interval: 60.000 msec (0x0060)
Window: 60.000 msec (0x0060)
Own address type: Public (0x00)
Filter policy: Ignore not in white list (0x01)
> HCI Event: Command Complete (0x0e) plen 4 #2 [hci0] 7.482814
LE Set Scan Parameters (0x08|0x000b) ncmd 1
Status: Success (0x00)
< HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2 #3 [hci0] 7.482909
Scanning: Enabled (0x01)
Filter duplicates: Enabled (0x01)
> HCI Event: Command Complete (0x0e) plen 4 #4 [hci0] 7.483658
LE Set Scan Enable (0x08|0x000c) ncmd 1
Status: Success (0x00)
> HCI Event: LE Meta Event (0x3e) plen 25 #5 [hci0] 7.501439
LE Advertising Report (0x02)
Num reports: 1
Event type: Connectable undirected - ADV_IND (0x00)
Address type: Public (0x00)
Address: 84:EB:18:0C:92:0F (Texas Instruments)
Data length: 13
Flags: 0x05
LE Limited Discoverable Mode
BR/EDR Not Supported
Appearance: Human Interface Device (0x03c0)
16-bit Service UUIDs (partial): 2 entries
Human Interface Device (0x1812)
Battery Service (0x180f)
RSSI: -55 dBm (0xc9)
< HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2 #6 [hci0] 7.501585
Scanning: Disabled (0x00)
Filter duplicates: Disabled (0x00)
> HCI Event: Command Complete (0x0e) plen 4 #7 [hci0] 7.505073
LE Set Scan Enable (0x08|0x000c) ncmd 1
Status: Success (0x00)
< HCI Command: LE Create Connection (0x08|0x000d) plen 25 #8 [hci0] 7.505187
Scan interval: 60.000 msec (0x0060)
Scan window: 60.000 msec (0x0060)
Filter policy: White list is not used (0x00)
Peer address type: Public (0x00)
Peer address: 84:EB:18:0C:92:0F (Texas Instruments)
Own address type: Public (0x00)
Min connection interval: 30.00 msec (0x0018)
Max connection interval: 50.00 msec (0x0028)
Connection latency: 0 (0x0000)
Supervision timeout: 420 msec (0x002a)
Min connection length: 0.000 msec (0x0000)
Max connection length: 0.000 msec (0x0000)
> HCI Event: Command Status (0x0f) plen 4 #9 [hci0] 7.505940
LE Create Connection (0x08|0x000d) ncmd 1
Status: Success (0x00)
> HCI Event: LE Meta Event (0x3e) plen 19 #10 [hci0] 7.525258
LE Connection Complete (0x01)
Status: Success (0x00)
Handle: 64
Role: Master (0x00)
Peer address type: Public (0x00)
Peer address: 84:EB:18:0C:92:0F (Texas Instruments)
Connection interval: 48.75 msec (0x0027)
Connection latency: 0 (0x0000)
Supervision timeout: 420 msec (0x002a)
Master clock accuracy: 0x00
@ MGMT Event: Device Connected (0x000b) plen 26 {0x0002} [hci0] 7.525347
LE Address: 84:EB:18:0C:92:0F (Texas Instruments)
Flags: 0x00000000
Data length: 13
Flags: 0x05
LE Limited Discoverable Mode
BR/EDR Not Supported
Appearance: Human Interface Device (0x03c0)
16-bit Service UUIDs (partial): 2 entries
Human Interface Device (0x1812)
Battery Service (0x180f)
@ MGMT Event: Device Connected (0x000b) plen 26 {0x0001} [hci0] 7.525347
LE Address: 84:EB:18:0C:92:0F (Texas Instruments)
Flags: 0x00000000
Data length: 13
Flags: 0x05
LE Limited Discoverable Mode
BR/EDR Not Supported
Appearance: Human Interface Device (0x03c0)
16-bit Service UUIDs (partial): 2 entries
Human Interface Device (0x1812)
Battery Service (0x180f)
< HCI Command: LE Read Remote Used Features (0x08|0x0016) plen 2 #11 [hci0] 7.525694
Handle: 64
> HCI Event: Command Status (0x0f) plen 4 #12 [hci0] 7.527893
LE Read Remote Used Features (0x08|0x0016) ncmd 1
Status: Success (0x00)
> HCI Event: LE Meta Event (0x3e) plen 12 #13 [hci0] 7.837849
LE Read Remote Used Features (0x04)
Status: Connection Failed to be Established (0x3e)
Handle: 64
Features: 0x1f 0x00 0x00 0x08 0x00 0x00 0x00 0x00
LE Encryption
Connection Parameter Request Procedure
Extended Reject Indication
Slave-initiated Features Exchange
LE Ping
Remote Public Key Validation
@ MGMT Event: Command Complete (0x0001) plen 10 {0x0001} [hci0] 7.837949
Pair Device (0x0019) plen 7
Status: Failed (0x03)
LE Address: 84:EB:18:0C:92:0F (Texas Instruments)
> HCI Event: Disconnect Complete (0x05) plen 4 #14 [hci0] 7.843837
Status: Success (0x00)
Handle: 64
Reason: Connection Failed to be Established (0x3e)
@ MGMT Event: Device Disconnected (0x000c) plen 8 {0x0002} [hci0] 7.843928
LE Address: 84:EB:18:0C:92:0F (Texas Instruments)
Reason: Unspecified (0x00)
@ MGMT Event: Device Disconnected (0x000c) plen 8 {0x0001} [hci0] 7.843928
LE Address: 84:EB:18:0C:92:0F (Texas Instruments)
Reason: Unspecified (0x00)杀虫器
sudo hcidump
HCI sniffer - Bluetooth packet analyzer ver 5.50
device: hci0 snap_len: 1500 filter: 0xffffffff
< HCI Command: LE Set Scan Parameters (0x08|0x000b) plen 7
type 0x00 (passive)
interval 60.000ms window 60.000ms
own address: 0x00 (Public) policy: white list only
> HCI Event: Command Complete (0x0e) plen 4
LE Set Scan Parameters (0x08|0x000b) ncmd 1
status 0x00
< HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2
value 0x01 (scanning enabled)
filter duplicates 0x01 (enabled)
> HCI Event: Command Complete (0x0e) plen 4
LE Set Scan Enable (0x08|0x000c) ncmd 1
status 0x00
> HCI Event: LE Meta Event (0x3e) plen 25
LE Advertising Report
ADV_IND - Connectable undirected advertising (0)
bdaddr 84:EB:18:0C:92:0F (Public)
Flags: 0x05
Unknown type 0x19 with 2 bytes data
Shortened service classes: 0x1812 0x180f
RSSI: -74
< HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2
value 0x00 (scanning disabled)
filter duplicates 0x00 (disabled)
> HCI Event: Command Complete (0x0e) plen 4
LE Set Scan Enable (0x08|0x000c) ncmd 1
status 0x00
< HCI Command: LE Create Connection (0x08|0x000d) plen 25
bdaddr 84:EB:18:0C:92:0F type 0
interval 96 window 96 initiator_filter 0
own_bdaddr_type 0 min_interval 24 max_interval 40
latency 0 supervision_to 42 min_ce 0 max_ce 0
> HCI Event: Command Status (0x0f) plen 4
LE Create Connection (0x08|0x000d) status 0x00 ncmd 1
> HCI Event: LE Meta Event (0x3e) plen 19
LE Connection Complete
status 0x00 handle 64, role master
bdaddr 84:EB:18:0C:92:0F (Public)
< HCI Command: LE Read Remote Used Features (0x08|0x0016) plen 2
> HCI Event: Command Status (0x0f) plen 4
LE Read Remote Used Features (0x08|0x0016) status 0x00 ncmd 1
> HCI Event: LE Meta Event (0x3e) plen 12
LE Read Remote Used Features Complete
status 0x3e handle 64
Error: Connection Failed to be Established
< HCI Command: Disconnect (0x01|0x0006) plen 3
handle 64 reason 0x13
Reason: Remote User Terminated Connection
> HCI Event: Disconn Complete (0x05) plen 4
status 0x00 handle 64 reason 0x3e
Reason: Connection Failed to be Established
> HCI Event: Command Status (0x0f) plen 4
Disconnect (0x01|0x0006) status 0x12 ncmd 1
Error: Invalid HCI Command Parameters回答 1
Stack Overflow用户
发布于 2021-07-08 11:50:18
让我们先确认一下这个。配对和连接是两件完全不同的事情。如果不先配对，就不能进行连接。
现在正在使用蓝牙can，我可以看到我的设备并对它进行配对，但是连接立即被丢弃：
这个假设是错误的，你根本无法配对你的设备。我们可以从bluetoothctl和日志的输出中了解这一点。
Failed to pair: org.bluez.Error.AuthenticationFailed
src/adapter.c:pair_device_complete() Failed (0x03)
您将得到这个[CHG] Device 84:EB:18:0C:92:0F Connected: yes，即使您失败了配对。从问题标签，它似乎是试图建立一个蓝牙连接树莓Pi，但你设置ControllerMode = le。但是你也提到了，你已经用其他设备做了这件事，这让我很困惑。
我脑子里没有什么解决办法。一个接一个地试试：
如果您的设备是蓝牙经典，则connect.
- Remove设置
ControllerMode = dual，而不是BLE。如果它是一个BLE设备，则
- 尝试使用gatttool(在5.50中工作)：
sudo gatttool -b 84:EB:18:0C:92:0F --interactive然后从源安装。不错的指南可用here.。configure --enable-tools，以便您也可以尝试btgatt-client工具。(我从未尝试过这一点，但似乎possible).
- Make肯定没有达到最大连接数。
- 对于所有蓝牙连接，我总是使用D-Bus API，而不是使用命令行工具。但这并不是微不足道的。下面是一个很好的例子，available.
-
是code
，我在其他机器上做了同样的设置，然后我可以让它开始工作，但这一次似乎出现了问题。
尝试另一个具有相同Pi的设备，弱连接也可能是原因之一。
如果这些没有帮助，请共享sudo btmon的输出。
更新
现在我们确定这是一个BLE设备，问题是外围(您的BLE远程)没有响应central (Pi) Status: Connection Failed to be Established (0x3e)。
这将带我们进入我建议的6解决方案，@Emil here.很好地解释了这个问题。我也会引用已给出的答案(想想主人/中央(Pi)、奴隶/外围(BLE Remote))：
“未能建立连接”意味着，在主服务器发送CONNECT_IND以响应ADV_IND之后，从服务器似乎不响应主发送的任何数据包。这要么是由于某些硬件或固件故障、信号质量差，要么是外围设备使用白色列表来忽略来自不需要的设备的连接。没有发生此错误的其他原因。
。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/68202067
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