如何解决错误的 HCI 事件：已完成的数据包数
我正在尝试运行一个 BLE 服务器，该服务器通过通知传输大约 35-40 KB/秒。我使用 BlueZ-5.54 通过 HCI 接口与利用 CYW20704 A2 芯片组的 BT860 Laird 蓝牙模块启动并运行服务器和通知。
问题在于 HCI 事件：已完成的数据包数。据我了解，一旦蓝牙控制器传输了缓冲数据包以指示可用容量，它就会发送此事件。此外，它是特定于制造的，无法控制。 芯片组最多可以缓冲 15 个长度为 251 的数据包。我通过使用 hcitool 发送原始命令来确认这一点。
到目前为止一切都很好，这里是问题描述：
- 应用程序向控制器发送 15 个数据包
- 在 2 x connection_interval_ms 后控制器回复 HCI 事件：完成的数据包数 = 2
- 这种情况一直持续到所有数据包都发送完毕。最后，控制器发送 8 个 HCI 事件：完成的数据包数 = 2/1，所有 2 x connection_interval_ms 相隔
我将“btmon”的输出粘贴到这里以便更好地了解情况（重要部分由 /******** 断行 ******/ 分隔）。
从输出中可以清楚地看出，控制器一次仅传输 2 个 ACL 数据包，然后等待 2xconnection_interval_ms。这确实是我的 BLE 服务器的瓶颈，请告诉我如何改进它！
I have tried 不同的连接间隔、mtu 大小甚至不同的客户端应用程序（nRF 连接和 RaspberryPi gatt 客户端）都给我相同的结果。以及通过 BT860 和 CYW20704 的文档。
有人可以帮我了解如何解决这个问题吗？本质上，
-
为什么数据包被缓冲而不传输？
-
如果它们正在传输，为什么控制器没有报告？我怎么知道这是否是控制器中的错误？
-
为什么“已完成数据包数”HCI 事件总是相隔 2 个连接间隔？我怎样才能控制它的频率？
/********************************************Initiate Connection and GATT Service discovery*****************************************/
> HCI Event: LE Meta Event (0x3e) plen 19 #289 [hci0] 1767.983447
LE Connection Complete (0x01)
Status: Success (0x00)
Handle: 64
Role: Slave (0x01)
Peer address type: Random (0x01)
Peer address: F5:2F:BD:4D:B4:A1 (Static)
Connection interval: 7.50 msec (0x0006)
Connection latency: 0 (0x0000)
Supervision timeout: 4000 msec (0x0190)
Master clock accuracy: 0x07
@ MGMT Event: Device Connected (0x000b) plen 13 {0x0002} [hci0] 1767.983514
LE Address: F5:2F:BD:4D:B4:A1 (Static)
Flags: 0x00000000
Data length: 0
@ MGMT Event: Device Connected (0x000b) plen 13 {0x0001} [hci0] 1767.983514
LE Address: F5:2F:BD:4D:B4:A1 (Static)
Flags: 0x00000000
Data length: 0
< HCI Command: LE Read Remote Used Features (0x08|0x0016) plen 2 #290 [hci0] 1767.983782
Handle: 64
> HCI Event: Command Status (0x0f) plen 4 #291 [hci0] 1767.985754
LE Read Remote Used Features (0x08|0x0016) ncmd 1
Status: Success (0x00)
> ACL Data RX: Handle 64 flags 0x02 dlen 11 #292 [hci0] 1768.003893
ATT: Read By Group Type Request (0x10) len 6
Handle range: 0x0001-0xffff
Attribute group type: Primary Service (0x2800)
> HCI Event: LE Meta Event (0x3e) plen 12 #293 [hci0] 1768.020620
LE Read Remote Used Features (0x04)
Status: Unsupported Remote Feature / Unsupported LMP Feature (0x1a)
Handle: 64
Features: 0xff 0x00 0x00 0x00 0x00 0x00 0x00 0x00
LE Encryption
Connection Parameter Request Procedure
Extended Reject Indication
Slave-initiated Features Exchange
LE Ping
LE Data Packet Length Extension
LL Privacy
Extended Scanner Filter Policies
< ACL Data TX: Handle 64 flags 0x00 dlen 16 #294 [hci0] 1768.020769
LE L2CAP: Connection Parameter Update Request (0x12) ident 1 len 8
Min interval: 24
Max interval: 40
Slave latency: 0
Timeout multiplier: 400
< ACL Data TX: Handle 64 flags 0x00 dlen 18 #295 [hci0] 1768.034943
ATT: Read By Group Type Response (0x11) len 13
Attribute data length: 6
Attribute group list: 2 entries
Handle range: 0x0001-0x0006
UUID: Generic Access Profile (0x1800)
Handle range: 0x0007-0x000a
UUID: Generic Attribute Profile (0x1801)
> HCI Event: LE Meta Event (0x3e) plen 11 #296 [hci0] 1768.043019
LE Data Length Change (0x07)
Handle: 64
Max TX octets: 251
Max TX time: 2120
Max RX octets: 251
Max RX time: 2120
> ACL Data RX: Handle 64 flags 0x02 dlen 10 #297 [hci0] 1768.050522
LE L2CAP: Connection Parameter Update Response (0x13) ident 1 len 2
Result: Connection Parameters accepted (0x0000)
> HCI Event: Number of Completed Packets (0x13) plen 5 #298 [hci0] 1768.058490
Num handles: 1
Handle: 64
Count: 2
> ACL Data RX: Handle 64 flags 0x02 dlen 11 #299 [hci0] 1768.065527
ATT: Read By Group Type Request (0x10) len 6
Handle range: 0x000b-0xffff
Attribute group type: Primary Service (0x2800)
< ACL Data TX: Handle 64 flags 0x00 dlen 26 #300 [hci0] 1768.065867
ATT: Read By Group Type Response (0x11) len 21
Attribute data length: 20
Attribute group list: 1 entry
Handle range: 0x000b-0x0012
UUID: Vendor specific (a79ef145-bde1-4bbd-8fbd-28d5dad70a97)
> ACL Data RX: Handle 64 flags 0x02 dlen 11 #301 [hci0] 1768.081234
ATT: Read By Group Type Request (0x10) len 6
Handle range: 0x0013-0xffff
Attribute group type: Primary Service (0x2800)
< ACL Data TX: Handle 64 flags 0x00 dlen 9 #302 [hci0] 1768.081687
ATT: Error Response (0x01) len 4
Read By Group Type Request (0x10)
Handle: 0x0013
Error: Attribute Not Found (0x0a)
> ACL Data RX: Handle 64 flags 0x02 dlen 7 #303 [hci0] 1768.095555
ATT: Read Request (0x0a) len 2
Handle: 0x000b
< ACL Data TX: Handle 64 flags 0x00 dlen 21 #304 [hci0] 1768.095684
ATT: Read Response (0x0b) len 16
Value: 970ad7dad528bd8fbd4be1bd45f19ea7
> HCI Event: Number of Completed Packets (0x13) plen 5 #305 [hci0] 1768.096516
Num handles: 1
Handle: 64
Count: 2
> HCI Event: LE Meta Event (0x3e) plen 10 #306 [hci0] 1768.103986
LE Connection Update Complete (0x03)
Status: Success (0x00)
Handle: 64
Connection interval: 30.00 msec (0x0018)
Connection latency: 0 (0x0000)
Supervision timeout: 4000 msec (0x0190)
> ACL Data RX: Handle 64 flags 0x02 dlen 11 #307 [hci0] 1768.163413
ATT: Read By Type Request (0x08) len 6
Handle range: 0x0001-0x0006
Attribute type: Characteristic (0x2803)
< ACL Data TX: Handle 64 flags 0x00 dlen 20 #308 [hci0] 1768.163731
ATT: Read By Type Response (0x09) len 15
Attribute data length: 7
Attribute data list: 2 entries
Handle: 0x0002
Value: 820300002a
Handle: 0x0005
Value: 020600012a
> ACL Data RX: Handle 64 flags 0x02 dlen 7 #309 [hci0] 1768.223048
ATT: Read Request (0x0a) len 2
Handle: 0x0003
< ACL Data TX: Handle 64 flags 0x00 dlen 27 #310 [hci0] 1768.223324
ATT: Read Response (0x0b) len 22
Value: 427261696e436f205261737062657272795069205374
> HCI Event: Number of Completed Packets (0x13) plen 5 #311 [hci0] 1768.223995
Num handles: 1
Handle: 64
Count: 2
> ACL Data RX: Handle 64 flags 0x02 dlen 7 #312 [hci0] 1768.313032
ATT: Read Request (0x0a) len 2
Handle: 0x0006
< ACL Data TX: Handle 64 flags 0x00 dlen 7 #313 [hci0] 1768.313294
ATT: Read Response (0x0b) len 2
Value: 8000
> ACL Data RX: Handle 64 flags 0x02 dlen 9 #314 [hci0] 1768.373681
ATT: Find Information Request (0x04) len 4
Handle range: 0x0004-0x0006
< ACL Data TX: Handle 64 flags 0x00 dlen 18 #315 [hci0] 1768.373818
ATT: Find Information Response (0x05) len 13
Format: UUID-16 (0x01)
Handle: 0x0004
UUID: Characteristic Extended Properties (0x2900)
Handle: 0x0005
UUID: Characteristic (0x2803)
Handle: 0x0006
UUID: Appearance (0x2a01)
> HCI Event: Number of Completed Packets (0x13) plen 5 #316 [hci0] 1768.373932
Num handles: 1
Handle: 64
Count: 2
> ACL Data RX: Handle 64 flags 0x02 dlen 7 #317 [hci0] 1768.433025
ATT: Read Request (0x0a) len 2
Handle: 0x0004
< ACL Data TX: Handle 64 flags 0x00 dlen 7 #318 [hci0] 1768.433350
ATT: Read Response (0x0b) len 2
Value: 0100
> ACL Data RX: Handle 64 flags 0x02 dlen 9 #319 [hci0] 1768.493683
ATT: Find Information Request (0x04) len 4
Handle range: 0x0007-0x0006
< ACL Data TX: Handle 64 flags 0x00 dlen 9 #320 [hci0] 1768.493961
ATT: Error Response (0x01) len 4
Find Information Request (0x04)
Handle: 0x0007
Error: Invalid Handle (0x01)
> HCI Event: Number of Completed Packets (0x13) plen 5 #321 [hci0] 1768.493965
Num handles: 1
Handle: 64
Count: 2
> ACL Data RX: Handle 64 flags 0x02 dlen 7 #322 [hci0] 1768.553023
ATT: Read Request (0x0a) len 2
Handle: 0x0003
< ACL Data TX: Handle 64 flags 0x00 dlen 27 #323 [hci0] 1768.553275
ATT: Read Response (0x0b) len 22
Value: 427261696e436f205261737062657272795069205374
> ACL Data RX: Handle 64 flags 0x02 dlen 9 #324 [hci0] 1768.613688
ATT: Read Blob Request (0x0c) len 4
Handle: 0x0003
Offset: 0x0016
< ACL Data TX: Handle 64 flags 0x00 dlen 21 #325 [hci0] 1768.614021
ATT: Read Blob Response (0x0d) len 16
61 72 6b 20 47 41 54 54 20 53 65 72 76 65 72 00 ark GATT Server.
> HCI Event: Number of Completed Packets (0x13) plen 5 #326 [hci0] 1768.614029
Num handles: 1
Handle: 64
Count: 2
> HCI Event: Number of Completed Packets (0x13) plen 5 #327 [hci0] 1768.904932
Num handles: 1
Handle: 64
Count: 1
> HCI Event: LE Meta Event (0x3e) plen 10 #328 [hci0] 1776.593921
LE Connection Update Complete (0x03)
Status: Success (0x00)
Handle: 64
Connection interval: 7.50 msec (0x0006)
Connection latency: 0 (0x0000)
Supervision timeout: 4000 msec (0x0190)
> ACL Data RX: Handle 64 flags 0x02 dlen 11 #329 [hci0] 1788.592219
ATT: Read By Type Request (0x08) len 6
Handle range: 0x000b-0x0012
Attribute type: Characteristic (0x2803)
< ACL Data TX: Handle 64 flags 0x00 dlen 27 #330 [hci0] 1788.592438
ATT: Read By Type Response (0x09) len 22
Attribute data length: 21
Attribute data list: 1 entry
Handle: 0x000c
Value: 100d00072c6b8a1e1aeda86b47cec24ebcd4e8
> ACL Data RX: Handle 64 flags 0x02 dlen 11 #331 [hci0] 1788.607574
ATT: Read By Type Request (0x08) len 6
Handle range: 0x000d-0x0012
Attribute type: Characteristic (0x2803)
< ACL Data TX: Handle 64 flags 0x00 dlen 27 #332 [hci0] 1788.607721
ATT: Read By Type Response (0x09) len 22
Attribute data length: 21
Attribute data list: 1 entry
Handle: 0x0010
Value: 0c110008c6a6034ef06baf8549343533924732
> ACL Data RX: Handle 64 flags 0x02 dlen 11 #333 [hci0] 1788.622590
ATT: Read By Type Request (0x08) len 6
Handle range: 0x0011-0x0012
Attribute type: Characteristic (0x2803)
< ACL Data TX: Handle 64 flags 0x00 dlen 9 #334 [hci0] 1788.622708
ATT: Error Response (0x01) len 4
Read By Type Request (0x08)
Handle: 0x0011
Error: Attribute Not Found (0x0a)
> HCI Event: Number of Completed Packets (0x13) plen 5 #335 [hci0] 1788.623156
Num handles: 1
Handle: 64
Count: 2
> ACL Data RX: Handle 64 flags 0x02 dlen 7 #336 [hci0] 1788.637230
ATT: Read Request (0x0a) len 2
Handle: 0x000c
< ACL Data TX: Handle 64 flags 0x00 dlen 24 #337 [hci0] 1788.637352
ATT: Read Response (0x0b) len 19
Value: 100d00072c6b8a1e1aeda86b47cec24ebcd4e8
> ACL Data RX: Handle 64 flags 0x02 dlen 7 #338 [hci0] 1788.652248
ATT: Read Request (0x0a) len 2
Handle: 0x0010
< ACL Data TX: Handle 64 flags 0x00 dlen 24 #339 [hci0] 1788.652361
ATT: Read Response (0x0b) len 19
Value: 0c110008c6a6034ef06baf8549343533924732
> HCI Event: Number of Completed Packets (0x13) plen 5 #340 [hci0] 1788.653195
Num handles: 1
Handle: 64
Count: 2
> ACL Data RX: Handle 64 flags 0x02 dlen 9 #341 [hci0] 1788.697157
ATT: Find Information Request (0x04) len 4
Handle range: 0x000e-0x0012
< ACL Data TX: Handle 64 flags 0x00 dlen 18 #342 [hci0] 1788.697287
ATT: Find Information Response (0x05) len 13
Format: UUID-16 (0x01)
Handle: 0x000e
UUID: Characteristic User Description (0x2901)
Handle: 0x000f
UUID: Client Characteristic Configuration (0x2902)
Handle: 0x0010
UUID: Characteristic (0x2803)
> ACL Data RX: Handle 64 flags 0x02 dlen 7 #343 [hci0] 1788.712242
ATT: Read Request (0x0a) len 2
Handle: 0x000e
< ACL Data TX: Handle 64 flags 0x00 dlen 18 #344 [hci0] 1788.712447
ATT: Read Response (0x0b) len 13
Value: 4545472052656164696e677300
> HCI Event: Number of Completed Packets (0x13) plen 5 #345 [hci0] 1788.712787
Num handles: 1
Handle: 64
Count: 2
> ACL Data RX: Handle 64 flags 0x02 dlen 7 #346 [hci0] 1788.727224
ATT: Read Request (0x0a) len 2
Handle: 0x000f
< ACL Data TX: Handle 64 flags 0x00 dlen 5 #347 [hci0] 1788.727405
ATT: Read Response (0x0b) len 0
Value:
> HCI Event: Number of Completed Packets (0x13) plen 5 #348 [hci0] 1788.749650
Num handles: 1
Handle: 64
Count: 2
> ACL Data RX: Handle 64 flags 0x02 dlen 9 #349 [hci0] 1788.764653
ATT: Find Information Request (0x04) len 4
Handle range: 0x0012-0x0012
< ACL Data TX: Handle 64 flags 0x00 dlen 10 #350 [hci0] 1788.764773
ATT: Find Information Response (0x05) len 5
Format: UUID-16 (0x01)
Handle: 0x0012
UUID: Characteristic User Description (0x2901)
> ACL Data RX: Handle 64 flags 0x02 dlen 7 #351 [hci0] 1788.779703
ATT: Read Request (0x0a) len 2
Handle: 0x0012
< ACL Data TX: Handle 64 flags 0x00 dlen 18 #352 [hci0] 1788.779898
ATT: Read Response (0x0b) len 13
Value: 4545472052656164696e677300
> HCI Event: Number of Completed Packets (0x13) plen 5 #353 [hci0] 1788.794650
Num handles: 1
Handle: 64
Count: 2
> ACL Data RX: Handle 64 flags 0x02 dlen 9 #354 [hci0] 1790.062100
ATT: Write Request (0x12) len 4
Handle: 0x000f
Data: 0100
/************************************************** START THE NOTIFICATIONS **********************************************************/
> ACL Data RX: Handle 64 flags 0x02 dlen 9 #354 [hci0] 1790.062100
ATT: Write Request (0x12) len 4
Handle: 0x000f
Data: 0100
< ACL Data TX: Handle 64 flags 0x00 dlen 5 #355 [hci0] 1790.062426
ATT: Write Response (0x13) len 0
< ACL Data TX: Handle 64 flags 0x00 dlen 27 #356 [hci0] 1790.063602
ATT: Handle Value Notification (0x1b) len 22
Handle: 0x000d
Data: 54f003008bce915f8bce915f8bce915f5483ac7e
< ACL Data TX: Handle 64 flags 0x00 dlen 27 #357 [hci0] 1790.064609
ATT: Handle Value Notification (0x1b) len 22
Handle: 0x000d
Data: 0000000030b6510100000000e8b651015483ac7e
< ACL Data TX: Handle 64 flags 0x00 dlen 27 #358 [hci0] 1790.065696
ATT: Handle Value Notification (0x1b) len 22
Handle: 0x000d
Data: 0000000030b6510100000000e8b651015483ac7e
< ACL Data TX: Handle 64 flags 0x00 dlen 27 #359 [hci0] 1790.066768
ATT: Handle Value Notification (0x1b) len 22
Handle: 0x000d
Data: 0000000030b6510100000000e8b651015483ac7e
< ACL Data TX: Handle 64 flags 0x00 dlen 27 #360 [hci0] 1790.067887
ATT: Handle Value Notification (0x1b) len 22
Handle: 0x000d
Data: 0000000030b6510100000000e8b651015483ac7e
< ACL Data TX: Handle 64 flags 0x00 dlen 27 #361 [hci0] 1790.068955
ATT: Handle Value Notification (0x1b) len 22
Handle: 0x000d
Data: 0000000030b6510100000000e8b651015483ac7e
< ACL Data TX: Handle 64 flags 0x00 dlen 27 #362 [hci0] 1790.070077
ATT: Handle Value Notification (0x1b) len 22
Handle: 0x000d
Data: 0000000030b6510100000000e8b651015483ac7e
< ACL Data TX: Handle 64 flags 0x00 dlen 27 #363 [hci0] 1790.071196
ATT: Handle Value Notification (0x1b) len 22
Handle: 0x000d
Data: 0000000030b6510100000000e8b651015483ac7e
< ACL Data TX: Handle 64 flags 0x00 dlen 27 #364 [hci0] 1790.072277
ATT: Handle Value Notification (0x1b) len 22
Handle: 0x000d
Data: 0000000030b6510100000000e8b651015483ac7e
< ACL Data TX: Handle 64 flags 0x00 dlen 27 #365 [hci0] 1790.073346
ATT: Handle Value Notification (0x1b) len 22
Handle: 0x000d
Data: 0000000030b6510100000000e8b651015483ac7e
< ACL Data TX: Handle 64 flags 0x00 dlen 27 #366 [hci0] 1790.074458
ATT: Handle Value Notification (0x1b) len 22
Handle: 0x000d
Data: 0000000030b6510100000000e8b651015483ac7e
< ACL Data TX: Handle 64 flags 0x00 dlen 27 #367 [hci0] 1790.075560
ATT: Handle Value Notification (0x1b) len 22
Handle: 0x000d
Data: 0000000030b6510100000000e8b651015483ac7e
< ACL Data TX: Handle 64 flags 0x00 dlen 27 #368 [hci0] 1790.076665
ATT: Handle Value Notification (0x1b) len 22
Handle: 0x000d
Data: 0000000030b6510100000000e8b651015483ac7e
< ACL Data TX: Handle 64 flags 0x00 dlen 27 #369 [hci0] 1790.077775
ATT: Handle Value Notification (0x1b) len 22
Handle: 0x000d
Data: 0000000030b6510100000000e8b651015483ac7e
> HCI Event: Number of Completed Packets (0x13) plen 5 #370 [hci0] 1790.084497
Num handles: 1
Handle: 64
Count: 2
< ACL Data TX: Handle 64 flags 0x00 dlen 27 #371 [hci0] 1790.084532
ATT: Handle Value Notification (0x1b) len 22
Handle: 0x000d
Data: 0000000030b6510100000000e8b651015483ac7e
< ACL Data TX: Handle 64 flags 0x00 dlen 27 #372 [hci0] 1790.084546
ATT: Handle Value Notification (0x1b) len 22
Handle: 0x000d
Data: 0000000030b6510100000000e8b651015483ac7e
> HCI Event: Number of Completed Packets (0x13) plen 5 #373 [hci0] 1790.099497
Num handles: 1
Handle: 64
Count: 2
/*******************************************BREAK: SKIP TO END OF TRANSFER ************************************************/
> HCI Event: Number of Completed Packets (0x13) plen 5 #493 [hci0] 1790.736984
Num handles: 1
Handle: 64
Count: 2
< ACL Data TX: Handle 64 flags 0x00 dlen 27 #494 [hci0] 1790.737022
ATT: Handle Value Notification (0x1b) len 22
Handle: 0x000d
Data: 0000000030b6510100000000e8b651015483ac7e
< ACL Data TX: Handle 64 flags 0x00 dlen 27 #495 [hci0] 1790.737037
ATT: Handle Value Notification (0x1b) len 22
Handle: 0x000d
Data: 0000000030b6510100000000e8b651015483ac7e
> HCI Event: Number of Completed Packets (0x13) plen 5 #496 [hci0] 1790.751975
Num handles: 1
Handle: 64
Count: 2
< ACL Data TX: Handle 64 flags 0x00 dlen 27 #497 [hci0] 1790.752012
ATT: Handle Value Notification (0x1b) len 22
Handle: 0x000d
Data: 0000000030b6510100000000e8b651015483ac7e
< ACL Data TX: Handle 64 flags 0x00 dlen 27 #498 [hci0] 1790.752027
ATT: Handle Value Notification (0x1b) len 22
Handle: 0x000d
Data: 0000000030b6510100000000e8b651015483ac7e
> HCI Event: Number of Completed Packets (0x13) plen 5 #499 [hci0] 1790.766970
Num handles: 1
Handle: 64
Count: 2
> HCI Event: Number of Completed Packets (0x13) plen 5 #500 [hci0] 1790.782000
Num handles: 1
Handle: 64
Count: 2
> HCI Event: Number of Completed Packets (0x13) plen 5 #501 [hci0] 1790.796968
Num handles: 1
Handle: 64
Count: 2
> HCI Event: Number of Completed Packets (0x13) plen 5 #502 [hci0] 1790.811970
Num handles: 1
Handle: 64
Count: 2
> HCI Event: Number of Completed Packets (0x13) plen 5 #503 [hci0] 1790.826973
Num handles: 1
Handle: 64
Count: 2
> HCI Event: Number of Completed Packets (0x13) plen 5 #504 [hci0] 1790.841972
Num handles: 1
Handle: 64
Count: 2
> HCI Event: Number of Completed Packets (0x13) plen 5 #505 [hci0] 1790.856964
Num handles: 1
Handle: 64
Count: 2
> HCI Event: Number of Completed Packets (0x13) plen 5 #506 [hci0] 1791.031954
Num handles: 1
Handle: 64
Count: 1 解决方法
为了获得更好的吞吐量，您应该通过设置更长的 mtu 和使用更长的通知来利用数据长度扩展。
反正这边是作为“奴隶”的角色跑的。但首先是主控制连接间隔应该保持打开多长时间，所以最好检查主设置并确保它使用长的“连接事件长度”。当这等于连接间隔时，您将获得最大吞吐量。
从站可以通过停止侦听来自主站的数据包来提前中止连接事件。这通常只有在无线电调度程序决定一个更重要的无线电事件现在需要无线电时才会这样做。
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