Bluetooth disconnects immediately after connect (Raspi with Android phone)

0

I'm trying to connect a mobile phone with a raspi Stretch over Bluetooth with BlueZ library (HashtagChris on github) with c#. The thing is, I can pair smoothly, no problem, but when I try to connect, it is marked as connected but phone seems to immediately ask disconnection (this is what I understood from btmon logs). Scanning works perfectly.

root@raspberrypi:/app# btmon
Bluetooth monitor ver 5.50
= Note: Linux version 4.19.66-v7+ (armv7l)                                                                                                                                          0.807788
= Note: Bluetooth subsystem version 2.22                                                                                                                                            0.807801
= New Index: B8:27:EB:0D:C1:8F (Primary,UART,hci0)                                                                                                                           [hci0] 0.807806
= Open Index: B8:27:EB:0D:C1:8F                                                                                                                                              [hci0] 0.807809
= Index Info: B8:27:EB:0D:C1:8F (Broadcom Corporation)                                                                                                                       [hci0] 0.807812
@ MGMT Open: bluetoothd (privileged) version 1.14                                                                                                                          {0x0001} 0.807816
@ MGMT Open: btmon (privileged) version 1.14                                                                                                                               {0x0002} 0.808401
> HCI Event: Connect Request (0x04) plen 10                                                                                                                               #1 [hci0] 8.307280
        Address: EC:8C:9A:89:9A:08 (OUI EC-8C-9A)
        Class: 0x5a020c
          Major class: Phone (cellular, cordless, payphone, modem)
          Minor class: Smart phone
          Networking (LAN, Ad hoc)
          Capturing (Scanner, Microphone)
          Object Transfer (v-Inbox, v-Folder)
          Telephony (Cordless telephony, Modem, Headset)
        Link type: ACL (0x01)
< HCI Command: Accept Connection Request (0x01|0x0009) plen 7                                                                                                             #2 [hci0] 8.307389
        Address: EC:8C:9A:89:9A:08 (OUI EC-8C-9A)
        Role: Master (0x00)
> HCI Event: Command Status (0x0f) plen 4                                                                                                                                 #3 [hci0] 8.307914
      Accept Connection Request (0x01|0x0009) ncmd 1
        Status: Success (0x00)
> HCI Event: Role Change (0x12) plen 8                                                                                                                                    #4 [hci0] 8.466426
        Status: Success (0x00)
        Address: EC:8C:9A:89:9A:08 (OUI EC-8C-9A)
        Role: Master (0x00)
> HCI Event: Connect Complete (0x03) plen 11                                                                                                                              #5 [hci0] 8.502669
        Status: Success (0x00)
        Handle: 11
        Address: EC:8C:9A:89:9A:08 (OUI EC-8C-9A)
        Link type: ACL (0x01)
        Encryption: Disabled (0x00)
< HCI Command: Read Remote Supported Features (0x01|0x001b) plen 2                                                                                                        #6 [hci0] 8.503022
        Handle: 11
> HCI Event: Command Status (0x0f) plen 4                                                                                                                                 #7 [hci0] 8.503572
      Read Remote Supported Features (0x01|0x001b) ncmd 1
        Status: Success (0x00)
> HCI Event: Read Remote Supported Features (0x0b) plen 11                                                                                                                #8 [hci0] 8.503724
        Status: Success (0x00)
        Handle: 11
        Features: 0xbf 0x3e 0x8d 0xfe 0xdb 0xff 0x5b 0x87
          3 slot packets
          5 slot packets
          Encryption
          Slot offset
          Timing accuracy
          Role switch
          Sniff mode
          Power control requests
          Channel quality driven data rate (CQDDR)
          SCO link
          HV2 packets
          HV3 packets
          CVSD synchronous data
          Power control
          Transparent synchronous data
          Broadcast Encryption
          Enhanced Data Rate ACL 2 Mbps mode
          Enhanced Data Rate ACL 3 Mbps mode
          Enhanced inquiry scan
          Interlaced inquiry scan
          Interlaced page scan
          RSSI with inquiry results
          Extended SCO link (EV3 packets)
          EV4 packets
          EV5 packets
          AFH capable slave
          AFH classification slave
          LE Supported (Controller)
          3-slot Enhanced Data Rate ACL packets
          5-slot Enhanced Data Rate ACL packets
          Sniff subrating
          Pause encryption
          AFH capable master
          AFH classification master
          Enhanced Data Rate eSCO 2 Mbps mode
          Enhanced Data Rate eSCO 3 Mbps mode
          3-slot Enhanced Data Rate eSCO packets
          Extended Inquiry Response
          Simultaneous LE and BR/EDR (Controller)
          Secure Simple Pairing
          Encapsulated PDU
          Non-flushable Packet Boundary Flag
          Link Supervision Timeout Changed Event
          Inquiry TX Power Level
          Enhanced Power Control
          Extended features
< HCI Command: Read Remote Extended Features (0x01|0x001c) plen 3                                                                                                         #9 [hci0] 8.503829
        Handle: 11
        Page: 1
> HCI Event: Command Status (0x0f) plen 4                                                                                                                                #10 [hci0] 8.504283
      Read Remote Extended Features (0x01|0x001c) ncmd 1
        Status: Success (0x00)
> HCI Event: Read Remote Extended Features (0x23) plen 13                                                                                                                #11 [hci0] 8.504523
        Status: Success (0x00)
        Handle: 11
        Page: 1/1
        Features: 0x07 0x00 0x00 0x00 0x00 0x00 0x00 0x00
          Secure Simple Pairing (Host Support)
          LE Supported (Host)
          Simultaneous LE and BR/EDR (Host)
< HCI Command: Remote Name Request (0x01|0x0019) plen 10                                                                                                                 #12 [hci0] 8.504631
        Address: EC:8C:9A:89:9A:08 (OUI EC-8C-9A)
        Page scan repetition mode: R2 (0x02)
        Page scan mode: Mandatory (0x00)
        Clock offset: 0x0000
< ACL Data TX: Handle 11 flags 0x00 dlen 10                                                                                                                              #13 [hci0] 8.504658
      L2CAP: Information Request (0x0a) ident 1 len 2
        Type: Extended features supported (0x0002)
> HCI Event: Command Status (0x0f) plen 4                                                                                                                                #14 [hci0] 8.505248
      Remote Name Request (0x01|0x0019) ncmd 1
        Status: Success (0x00)
> HCI Event: Max Slots Change (0x1b) plen 3                                                                                                                              #15 [hci0] 8.509028
        Handle: 11
        Max slots: 5
> ACL Data RX: Handle 11 flags 0x02 dlen 10                                                                                                                              #16 [hci0] 8.532649
      L2CAP: Information Request (0x0a) ident 2 len 2
        Type: Extended features supported (0x0002)
< ACL Data TX: Handle 11 flags 0x00 dlen 16                                                                                                                              #17 [hci0] 8.532730
      L2CAP: Information Response (0x0b) ident 2 len 8
        Type: Extended features supported (0x0002)
        Result: Success (0x0000)
        Features: 0x000002b8
          Enhanced Retransmission Mode
          Streaming Mode
          FCS Option
          Fixed Channels
          Unicast Connectionless Data Reception
> HCI Event: Remote Name Req Complete (0x07) plen 255                                                                                                                    #18 [hci0] 8.535110
        Status: Success (0x00)
        Address: EC:8C:9A:89:9A:08 (OUI EC-8C-9A)
        Name: HUAWEI Y5 2018
@ MGMT Event: Device Connected (0x000b) plen 34                                                                                                                     {0x0002} [hci0] 8.535184
        BR/EDR Address: EC:8C:9A:89:9A:08 (OUI EC-8C-9A)
        Flags: 0x00000000
        Data length: 21
        Name (complete): HUAWEI Y5 2018
        Class: 0x5a020c
          Major class: Phone (cellular, cordless, payphone, modem)
          Minor class: Smart phone
          Networking (LAN, Ad hoc)
          Capturing (Scanner, Microphone)
          Object Transfer (v-Inbox, v-Folder)
          Telephony (Cordless telephony, Modem, Headset)
@ MGMT Event: Device Connected (0x000b) plen 34                                                                                                                     {0x0001} [hci0] 8.535184
        BR/EDR Address: EC:8C:9A:89:9A:08 (OUI EC-8C-9A)
        Flags: 0x00000000
        Data length: 21
        Name (complete): HUAWEI Y5 2018
        Class: 0x5a020c
          Major class: Phone (cellular, cordless, payphone, modem)
          Minor class: Smart phone
          Networking (LAN, Ad hoc)
          Capturing (Scanner, Microphone)
          Object Transfer (v-Inbox, v-Folder)
          Telephony (Cordless telephony, Modem, Headset)
> ACL Data RX: Handle 11 flags 0x02 dlen 16                                                                                                                              #19 [hci0] 8.535253
      L2CAP: Information Response (0x0b) ident 1 len 8
        Type: Extended features supported (0x0002)
        Result: Success (0x0000)
        Features: 0x000000b8
          Enhanced Retransmission Mode
          Streaming Mode
          FCS Option
          Fixed Channels
< ACL Data TX: Handle 11 flags 0x00 dlen 10                                                                                                                              #20 [hci0] 8.535319
      L2CAP: Information Request (0x0a) ident 2 len 2
        Type: Fixed channels supported (0x0003)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                   #21 [hci0] 8.535348
        Num handles: 1
        Handle: 11
        Count: 2
> HCI Event: Link Key Request (0x17) plen 6                                                                                                                              #22 [hci0] 8.555279
        Address: EC:8C:9A:89:9A:08 (OUI EC-8C-9A)
< HCI Command: Link Key Request Reply (0x01|0x000b) plen 22                                                                                                              #23 [hci0] 8.555362
        Address: EC:8C:9A:89:9A:08 (OUI EC-8C-9A)
        Link key: bfc51cdfca37d8a7db87f1600b48151b
> ACL Data RX: Handle 11 flags 0x02 dlen 10                                                                                                                              #24 [hci0] 8.557694
      L2CAP: Information Request (0x0a) ident 3 len 2
        Type: Fixed channels supported (0x0003)
> HCI Event: Command Complete (0x0e) plen 10                                                                                                                             #25 [hci0] 8.557720
      Link Key Request Reply (0x01|0x000b) ncmd 1
        Status: Success (0x00)
        Address: EC:8C:9A:89:9A:08 (OUI EC-8C-9A)
< ACL Data TX: Handle 11 flags 0x00 dlen 20                                                                                                                              #26 [hci0] 8.557859
      L2CAP: Information Response (0x0b) ident 3 len 12
        Type: Fixed channels supported (0x0003)
        Result: Success (0x0000)
        Channels: 0x0000000000000086
          L2CAP Signaling (BR/EDR)
          Connectionless reception
          Security Manager (BR/EDR)
> ACL Data RX: Handle 11 flags 0x02 dlen 20                                                                                                                              #27 [hci0] 8.558999
      L2CAP: Information Response (0x0b) ident 2 len 12
        Type: Fixed channels supported (0x0003)
        Result: Success (0x0000)
        Channels: 0x0000000000000082
          L2CAP Signaling (BR/EDR)
          Security Manager (BR/EDR)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                   #28 [hci0] 8.561531
        Num handles: 1
        Handle: 11
        Count: 2
> HCI Event: Encryption Change (0x08) plen 4                                                                                                                             #29 [hci0] 8.592289
        Status: Success (0x00)
        Handle: 11
        Encryption: Enabled with E0 (0x01)
< HCI Command: Read Encryption Key Size (0x05|0x0008) plen 2                                                                                                             #30 [hci0] 8.592374
        Handle: 11
> HCI Event: Command Complete (0x0e) plen 7                                                                                                                              #31 [hci0] 8.592882
      Read Encryption Key Size (0x05|0x0008) ncmd 1
        Status: Success (0x00)
        Handle: 11
        Key size: 16
> ACL Data RX: Handle 11 flags 0x02 dlen 12                                                                                                                              #32 [hci0] 8.610146
      L2CAP: Connection Request (0x02) ident 4 len 4
        PSM: 3 (0x0003)
        Source CID: 67
< ACL Data TX: Handle 11 flags 0x00 dlen 16                                                                                                                              #33 [hci0] 8.610288
      L2CAP: Connection Response (0x03) ident 4 len 8
        Destination CID: 64
        Source CID: 67
        Result: Connection successful (0x0000)
        Status: No further information available (0x0000)
< ACL Data TX: Handle 11 flags 0x00 dlen 27                                                                                                                              #34 [hci0] 8.610311
      L2CAP: Configure Request (0x04) ident 3 len 19
        Destination CID: 67
        Flags: 0x0000
        Option: Maximum Transmission Unit (0x01) [mandatory]
          MTU: 1013
        Option: Retransmission and Flow Control (0x04) [mandatory]
          Mode: Basic (0x00)
          TX window size: 0
          Max transmit: 0
          Retransmission timeout: 0
          Monitor timeout: 0
          Maximum PDU size: 0
> ACL Data RX: Handle 11 flags 0x02 dlen 16                                                                                                                              #35 [hci0] 8.614047
      L2CAP: Configure Request (0x04) ident 5 len 8
        Destination CID: 64
        Flags: 0x0000
        Option: Maximum Transmission Unit (0x01) [mandatory]
          MTU: 1691
< ACL Data TX: Handle 11 flags 0x00 dlen 18                                                                                                                              #36 [hci0] 8.614151
      L2CAP: Configure Response (0x05) ident 5 len 10
        Source CID: 67
        Flags: 0x0000
        Result: Success (0x0000)
        Option: Maximum Transmission Unit (0x01) [mandatory]
          MTU: 1691
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                   #37 [hci0] 8.614192
        Num handles: 1
        Handle: 11
        Count: 2
> ACL Data RX: Handle 11 flags 0x02 dlen 14                                                                                                                              #38 [hci0] 8.615164
      L2CAP: Configure Response (0x05) ident 3 len 6
        Source CID: 64
        Flags: 0x0000
        Result: Success (0x0000)
> ACL Data RX: Handle 11 flags 0x02 dlen 8                                                                                                                               #39 [hci0] 8.663890
      Channel: 64 len 4 [PSM 3 mode 0] {chan 0}
      RFCOMM: Set Async Balance Mode (SABM) (0x2f)
         Address: 0x03 cr 1 dlci 0x00
         Control: 0x3f poll/final 1
         Length: 0
         FCS: 0x1c
< ACL Data TX: Handle 11 flags 0x00 dlen 8                                                                                                                               #40 [hci0] 8.664053
      Channel: 67 len 4 [PSM 3 mode 0] {chan 0}
      RFCOMM: Unnumbered Ack (UA) (0x63)
         Address: 0x03 cr 1 dlci 0x00
         Control: 0x73 poll/final 1
         Length: 0
         FCS: 0xd7
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                   #41 [hci0] 8.666513
        Num handles: 1
        Handle: 11
        Count: 2
> ACL Data RX: Handle 11 flags 0x02 dlen 18                                                                                                                              #42 [hci0] 8.667692
      Channel: 64 len 14 [PSM 3 mode 0] {chan 0}
      RFCOMM: Unnumbered Info with Header Check (UIH) (0xef)
         Address: 0x03 cr 1 dlci 0x00
         Control: 0xef poll/final 0
         Length: 10
         FCS: 0x70
         MCC Message type: DLC Parameter Negotiation CMD (0x20)
           Length: 8
           dlci 2 frame_type 0 credit_flow 15 pri 0
           ack_timer 0 frame_size 990 max_retrans 0 credits 7
< ACL Data TX: Handle 11 flags 0x00 dlen 8                                                                                                                               #43 [hci0] 8.667826
      Channel: 67 len 4 [PSM 3 mode 0] {chan 0}
      RFCOMM: Disconnect Mode (DM) (0x0f)
         Address: 0x0b cr 1 dlci 0x02
         Control: 0x1f poll/final 1
         Length: 0
         FCS: 0x73
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                   #44 [hci0] 8.802513
        Num handles: 1
        Handle: 11
        Count: 1
> ACL Data RX: Handle 11 flags 0x02 dlen 8                                                                                                                              #45 [hci0] 10.682652
      Channel: 64 len 4 [PSM 3 mode 0] {chan 0}
      RFCOMM: Disconnect (DISC) (0x43)
         Address: 0x03 cr 1 dlci 0x00
         Control: 0x53 poll/final 1
         Length: 0
         FCS: 0xfd
< ACL Data TX: Handle 11 flags 0x00 dlen 8                                                                                                                              #46 [hci0] 10.682828
      Channel: 67 len 4 [PSM 3 mode 0] {chan 0}
      RFCOMM: Unnumbered Ack (UA) (0x63)
         Address: 0x03 cr 1 dlci 0x00
         Control: 0x73 poll/final 1
         Length: 0
         FCS: 0xd7
< ACL Data TX: Handle 11 flags 0x00 dlen 12                                                                                                                             #47 [hci0] 10.682855
      L2CAP: Disconnection Request (0x06) ident 4 len 4
        Destination CID: 67
        Source CID: 64
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                  #48 [hci0] 10.687781
        Num handles: 1
        Handle: 11
        Count: 2
> ACL Data RX: Handle 11 flags 0x02 dlen 12                                                                                                                             #49 [hci0] 10.688941
      L2CAP: Disconnection Request (0x06) ident 6 len 4
        Destination CID: 64
        Source CID: 67
< ACL Data TX: Handle 11 flags 0x00 dlen 12                                                                                                                             #50 [hci0] 10.689055
      L2CAP: Disconnection Response (0x07) ident 6 len 4
        Destination CID: 64
        Source CID: 67
> ACL Data RX: Handle 11 flags 0x02 dlen 12                                                                                                                             #51 [hci0] 10.706419
      L2CAP: Disconnection Response (0x07) ident 4 len 4
        Destination CID: 67
        Source CID: 64
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                                  #52 [hci0] 10.927518
        Num handles: 1
        Handle: 11
        Count: 1
< HCI Command: Disconnect (0x01|0x0006) plen 3                                                                                                                          #53 [hci0] 14.697967
        Handle: 11
        Reason: Remote User Terminated Connection (0x13)
> HCI Event: Command Status (0x0f) plen 4                                                                                                                               #54 [hci0] 14.698624
      Disconnect (0x01|0x0006) ncmd 1
        Status: Success (0x00)
> HCI Event: Disconnect Complete (0x05) plen 4                                                                                                                          #55 [hci0] 14.778933
        Status: Success (0x00)
        Handle: 11
        Reason: Connection Terminated By Local Host (0x16)
@ MGMT Event: Device Disconnected (0x000c) plen 8                                                                                                                  {0x0002} [hci0] 14.779002
        BR/EDR Address: EC:8C:9A:89:9A:08 (OUI EC-8C-9A)
        Reason: Connection terminated by local host (0x02)
@ MGMT Event: Device Disconnected (0x000c) plen 8                                                                                                                  {0x0001} [hci0] 14.779002
        BR/EDR Address: EC:8C:9A:89:9A:08 (OUI EC-8C-9A)
        Reason: Connection terminated by local host (0x02)

And this if content of /etc/systemd/system/dbus-org.bluez.service

[Unit]
Description=Bluetooth service
Documentation=man:bluetoothd(8)
ConditionPathIsDirectory=/sys/class/bluetooth

[Service]
Type=dbus
BusName=org.bluez
ExecStart=/usr/lib/bluetooth/bluetoothd -C -d
ExecStartPost=/usr/bin/sdptool add SP
ExecStartPost=/bin/hciconfig hci0 up
ExecStartPost=/bin/hciconfig hci0 piscan
ExecStartPost=/bin/hciconfig hci0 sspmode 1
NotifyAccess=main
#WatchdogSec=10
#Restart=on-failure
CapabilityBoundingSet=CAP_NET_ADMIN CAP_NET_BIND_SERVICE
LimitNPROC=1
ProtectHome=true
ProtectSystem=full

[Install]
WantedBy=bluetooth.target
Alias=dbus-org.bluez.service

By the way, second thing, I'm having a Exception: Tmds.DBus.DBusException: org.bluez.Error.Failed: Protocol not available error when connecting in my C# program, if anyone knows why.

c#
android
bluetooth
disconnect
asked on Stack Overflow Dec 11, 2019 by lalannou

0 Answers

Nobody has answered this question yet.


User contributions licensed under CC BY-SA 3.0