Configurando um PAN Bluetooth

10

Estou tentando criar um PAN Bluetooth entre dois dispositivos, onde posso acessar serviços da Web baseados em REST por meio da conexão Bluetooth. Eu tive algum sucesso com várias provas de conceitos (Bluetooth herdado e Bluetooth Smart), mas estou tendo problemas ao tentar criar uma rede do Grupo ou uma PANU < - > Rede PANU. Eu consigo fazer uma rede funcionar usando o cenário de ponto de acesso de rede, no entanto, nosso caso de uso precisa ser um único dispositivo se comunicando com outro dispositivo único, sem roteamento para outros dispositivos ou redes.

Para começar, eu tenho um Raspberry Pi com o mais recente sistema operacional Raspbian. Isso vem com o bluez 5.23. Para obter o funcionamento do ponto de acesso à rede, estou usando o seguinte código:

brctl addbr pan0
brctl setfd pan0 0
brctl stp pan0 off

ifconfig pan0 inet6 add fd00::5ef3:70ff:xxxx:xxxx
iplink set pan0 up

bt-network –d –s nap pan0

Isso funciona muito bem e consigo conectar dispositivos Linux e Windows. Eu também sou capaz de acessar um servidor web Apache em execução no Raspberry Pi a partir do dispositivo que eu conectei a ele.

No dispositivo Linux, eu uso o blueman para conectar. Eu também usei a rede bt com a opção –c para conectar também. Para o dispositivo Windows (tablet do Windows 10), emparelho o dispositivo e, em seguida, conecto-me à rede a partir da tela Dispositivos de rede de área pessoal Bluetooth. Eu precisava usar o bluetoothctl para confiar em ambos os dispositivos antes de me conectar.

Com o NAP funcionando, eu queria tentar colocar a rede do grupo ou a rede panu-panu funcionando como descrito neste documento: link Esses cenários funcionariam melhor para nós, já que não queremos rotear para redes ou dispositivos adicionais (o cenário panu-panu seria ideal)

Meu pensamento inicial é tudo que eu preciso fazer é mudar o comando bt-network para um desses dois comandos:

bt-network –d –s gn pan0

bt-network –d –s panu pan0

Esses dois comandos iniciam com qualquer erro, mas não consigo estabelecer uma conexão de rede entre meus dispositivos Linux ou Windows. Eu sou capaz de emparelhar com sucesso os dispositivos (estou usando o comando “hciconfig hci0 piscan” para anunciar), mas não consigo atualizar a rede.

Se eu executar o hcidump, recebo a seguinte saída. Note que eu incluí o hcidump inteiro da tentativa de conexão, então é bem longo, mas eu pensei que isso poderia ajudar a identificar o problema. Isso é para uma rede de grupo, mas recebo o mesmo erro com o cenário panu-panu:

HCI sniffer - Bluetooth packet analyzer ver 5.23
device: hci0 snap_len: 1500 filter: 0xffffffff
> HCI Event: Connect Request (0x04) plen 10
    bdaddr 5C:F3:70:66:XX:XX class 0x000000 type ACL
< HCI Command: Accept Connection Request (0x01|0x0009) plen 7
    bdaddr 5C:F3:70:66:XX:XX role 0x00
    Role: Master
> HCI Event: Command Status (0x0f) plen 4
    Accept Connection Request (0x01|0x0009) status 0x00 ncmd 1
> HCI Event: Role Change (0x12) plen 8
    status 0x00 bdaddr 5C:F3:70:66:XX:XX role 0x00
    Role: Master
> HCI Event: Connect Complete (0x03) plen 11
    status 0x00 handle 11 bdaddr 5C:F3:70:66:XX:XX type ACL encrypt 0x00
< HCI Command: Read Remote Supported Features (0x01|0x001b) plen 2
    handle 11
> HCI Event: Command Status (0x0f) plen 4
    Read Remote Supported Features (0x01|0x001b) status 0x00 ncmd 1
> HCI Event: Max Slots Change (0x1b) plen 3
    handle 11 slots 5
> HCI Event: Read Remote Supported Features (0x0b) plen 11
    status 0x00 handle 11
    Features: 0xbf 0xfe 0xcf 0xfe 0xdb 0xff 0x7b 0x87
< HCI Command: Read Remote Extended Features (0x01|0x001c) plen 3
    handle 11 page 1
> HCI Event: Command Status (0x0f) plen 4
    Read Remote Extended Features (0x01|0x001c) status 0x00 ncmd 1
> HCI Event: Read Remote Extended Features (0x23) plen 13
    status 0x00 handle 11 page 1 max 1
    Features: 0x03 0x00 0x00 0x00 0x00 0x00 0x00 0x00
< HCI Command: Remote Name Request (0x01|0x0019) plen 10
    bdaddr 5C:F3:70:66:XX:XX mode 2 clkoffset 0x0000
< ACL data: handle 11 flags 0x00 dlen 10
    L2CAP(s): Info req: type 2
> HCI Event: Command Status (0x0f) plen 4
    Remote Name Request (0x01|0x0019) status 0x00 ncmd 1
> HCI Event: Remote Name Req Complete (0x07) plen 255
    status 0x00 bdaddr 5C:F3:70:66:XX:XX name 'raspberrypi'
> HCI Event: IO Capability Response (0x32) plen 9
    bdaddr 5C:F3:70:66:XX:XX capability 0x01 oob 0x00 auth 0x03
    Capability: DisplayYesNo (OOB data not present)
    Authentication: Dedicated Bonding (MITM Protection)
> HCI Event: IO Capability Request (0x31) plen 6
    bdaddr 5C:F3:70:66:XX:XX
< HCI Command: IO Capability Request Reply (0x01|0x002b) plen 9
    bdaddr 5C:F3:70:66:XX:XX capability 0x03 oob 0x00 auth 0x02
    Capability: NoInputNoOutput (OOB data not present)
    Authentication: Dedicated Bonding (No MITM Protection)
> HCI Event: Command Complete (0x0e) plen 10
    IO Capability Request Reply (0x01|0x002b) ncmd 1
    status 0x00 bdaddr 5C:F3:70:66:XX:XX
> HCI Event: Number of Completed Packets (0x13) plen 5
    handle 11 packets 1
> HCI Event: User Confirmation Request (0x33) plen 10
    bdaddr 5C:F3:70:66:XX:XX passkey 774674
< HCI Command: User Confirmation Request Reply (0x01|0x002c) plen 6
    bdaddr 5C:F3:70:66:XX:XX
> HCI Event: Command Complete (0x0e) plen 10
    User Confirmation Request Reply (0x01|0x002c) ncmd 1
    status 0x00 bdaddr 5C:F3:70:66:XX:XX
> HCI Event: Simple Pairing Complete (0x36) plen 7
    status 0x00 bdaddr 5C:F3:70:66:XX:XX
> HCI Event: Link Key Notification (0x18) plen 23
    bdaddr 5C:F3:70:66:XX:XX key 839802CBF65CA6D1D864F91831A288B0 type 4
    Type: Unauthenticated Combination Key
> HCI Event: Encrypt Change (0x08) plen 4
    status 0x00 handle 11 encrypt 0x01
> ACL data: handle 11 flags 0x02 dlen 10
    L2CAP(s): Info req: type 2
> ACL data: handle 11 flags 0x02 dlen 16
    L2CAP(s): Info rsp: type 2 result 0
      Extended feature mask 0x02b8
        Enhanced Retransmission mode
        Streaming mode
        FCS Option
        Fixed Channels
        Unicast Connectless Data Reception
< ACL data: handle 11 flags 0x00 dlen 16
    L2CAP(s): Info rsp: type 2 result 0
      Extended feature mask 0x02b8
        Enhanced Retransmission mode
        Streaming mode
        FCS Option
        Fixed Channels
        Unicast Connectless Data Reception
< ACL data: handle 11 flags 0x00 dlen 10
    L2CAP(s): Info req: type 3
> ACL data: handle 11 flags 0x02 dlen 10
    L2CAP(s): Info req: type 3
< ACL data: handle 11 flags 0x00 dlen 20
    L2CAP(s): Info rsp: type 3 result 0
      Fixed channel list 0x00000006
        L2CAP Signalling Channel
        L2CAP Connless
> HCI Event: Number of Completed Packets (0x13) plen 5
    handle 11 packets 2
> ACL data: handle 11 flags 0x02 dlen 20
    L2CAP(s): Info rsp: type 3 result 0
      Fixed channel list 0x00000006
        L2CAP Signalling Channel
        L2CAP Connless
> ACL data: handle 11 flags 0x02 dlen 12
    L2CAP(s): Connect req: psm 1 scid 0x0040
< ACL data: handle 11 flags 0x00 dlen 16
    L2CAP(s): Connect rsp: dcid 0x0040 scid 0x0040 result 0 status 0
      Connection successful
< ACL data: handle 11 flags 0x00 dlen 23
    L2CAP(s): Config req: dcid 0x0040 flags 0x00 clen 11
      RFC 0x00 (Basic) 
> HCI Event: Number of Completed Packets (0x13) plen 5
    handle 11 packets 2
> ACL data: handle 11 flags 0x02 dlen 23
    L2CAP(s): Config req: dcid 0x0040 flags 0x00 clen 11
      RFC 0x00 (Basic) 
< ACL data: handle 11 flags 0x00 dlen 18
    L2CAP(s): Config rsp: scid 0x0040 flags 0x00 result 0 clen 4
      MTU 672 
> ACL data: handle 11 flags 0x02 dlen 18
    L2CAP(s): Config rsp: scid 0x0040 flags 0x00 result 0 clen 4
      MTU 672 
> HCI Event: Number of Completed Packets (0x13) plen 5
    handle 11 packets 2
> ACL data: handle 11 flags 0x02 dlen 24
    L2CAP(d): cid 0x0040 len 20 [psm 1]
        SDP SSA Req: tid 0x0 len 0xf
          pat uuid-16 0x0100 (L2CAP)
          max 65535
          aid(s) 0x0000 - 0xffff
          cont 00
< ACL data: handle 11 flags 0x00 dlen 606
    L2CAP(d): cid 0x0040 len 602 [psm 1]
        SDP SSA Rsp: tid 0x0 len 0x255
          count 594
          record #0
              aid 0x0000 (SrvRecHndl)
                 uint 0x10001
              aid 0x0001 (SrvClassIDList)
                 < uuid-16 0x1800 >
              aid 0x0004 (ProtocolDescList)
                 < < uuid-16 0x0100 (L2CAP) uint 0x1f > <
                 uuid-16 0x0007 uint 0x1 uint 0x8 > >
              aid 0x0005 (BrwGrpList)
                 < uuid-16 0x1002 (PubBrwsGrp) >
              aid 0x000a (DocURL)
                 url "http://www.bluez.org/"
              aid 0x000b (ClientExeURL)
                 url "http://www.bluez.org/"
              aid 0x000c (IconURL)
                 url "http://www.bluez.org/"
              aid 0x0100 (SrvName)
                 str "Generic Access Profile"
              aid 0x0102 (ProviderName)
                 str "BlueZ"
          record #1
              aid 0x0000 (SrvRecHndl)
                 uint 0x10002
              aid 0x0001 (SrvClassIDList)
                 < uuid-16 0x1801 >
              aid 0x0004 (ProtocolDescList)
                 < < uuid-16 0x0100 (L2CAP) uint 0x1f > <
                 uuid-16 0x0007 uint 0x10 uint 0x10 > >
              aid 0x0005 (BrwGrpList)
                 < uuid-16 0x1002 (PubBrwsGrp) >
              aid 0x0100 (SrvName)
                 str "Generic Attribute Profile"
              aid 0x0102 (ProviderName)
                 str "BlueZ"
          record #2
              aid 0x0000 (SrvRecHndl)
                 uint 0x10003
              aid 0x0001 (SrvClassIDList)
                 < uuid-16 0x110e (AVRemote) uuid-16 0x110f (AVRemCt) >
              aid 0x0004 (ProtocolDescList)
                 < < uuid-16 0x0100 (L2CAP) uint 0x17 > <
                 uuid-16 0x0017 (AVCTP) uint 0x103 > >
              aid 0x0005 (BrwGrpList)
                 < uuid-16 0x1002 (PubBrwsGrp) >
              aid 0x0009 (BTProfileDescList)
                 < < uuid-16 0x110e (AVRemote) uint 0x105 > >
              aid 0x000d (AdditionalProtocolDescLists)
                 < < < uuid-16 0x0100 (L2CAP) uint 0x1b > < uuid-16 0x0017 (AVCTP) uint 0x103 > > >
              aid 0x0100 (SrvName)
                 str "AVRCP CT"
              aid 0x0311 (SuppFeatures)
                 uint 0x4f
          record #3
              aid 0x0000 (SrvRecHndl)
                 uint 0x10004
              aid 0x0001 (SrvClassIDList)
                 < uuid-16 0x110c (AVRemTarget) >
              aid 0x0004 (ProtocolDescList)
                 < < uuid-16 0x0100 (L2CAP) uint 0x17 > <
                 uuid-16 0x0017 (AVCTP) uint 0x103 > >
              aid 0x0005 (BrwGrpList)
                 < uuid-16 0x1002 (PubBrwsGrp) >
              aid 0x0009 (BTProfileDescList)
                 < < uuid-16 0x110e (AVRemote) uint 0x104 > >
              aid 0x000d (AdditionalProtocolDescLists)
                 < < < uuid-16 0x0100 (L2CAP) uint 0x1b > < uuid-16 0x0017 (AVCTP) uint 0x103 > > >
              aid 0x0100 (SrvName)
                 str "AVRCP TG"
              aid 0x0311 (SuppFeatures)
                 uint 0x5f
          record #4
              aid 0x0000 (SrvRecHndl)
                 uint 0x10005
              aid 0x0001 (SrvClassIDList)
                 < uuid-16 0x1117 (GN) >
              aid 0x0004 (ProtocolDescList)
                 < < uuid-16 0x0100 (L2CAP) uint 0xf > <
                 uuid-16 0x000f (BNEP) uint 0x100 < uint 0x800 uint 0x806 > > >
              aid 0x0005 (BrwGrpList)
                 < uuid-16 0x1002 (PubBrwsGrp) >
              aid 0x0006 (LangBaseAttrIDList)
                 < uint 0x656e uint 0x6a uint 0x100 >
              aid 0x0009 (BTProfileDescList)
                 < < uuid-16 0x1117 (GN) uint 0x100 > >
              aid 0x0100 (SrvName)
                 str "Network service"
              aid 0x0101 (SrvDesc)
                 str "Network service"
              aid 0x030a (SecurityDescription)
                 uint 0x1
          cont 00
> ACL data: handle 11 flags 0x02 dlen 24
    L2CAP(d): cid 0x0040 len 20 [psm 1]
        SDP SSA Req: tid 0x1 len 0xf
          pat uuid-16 0x1200 (PNPInfo)
          max 65535
          aid(s) 0x0000 - 0xffff
          cont 00
< ACL data: handle 11 flags 0x00 dlen 88
    L2CAP(d): cid 0x0040 len 84 [psm 1]
        SDP SSA Rsp: tid 0x1 len 0x4f
          count 76
          record #0
              aid 0x0000 (SrvRecHndl)
                 uint 0x10000
              aid 0x0001 (SrvClassIDList)
                 < uuid-16 0x1200 (PNPInfo) >
              aid 0x0005 (BrwGrpList)
                 < uuid-16 0x1002 (PubBrwsGrp) >
              aid 0x0009 (BTProfileDescList)
                 < < uuid-16 0x1200 (PNPInfo) uint 0x103 > >
              aid 0x0200 (VersionNumList)
                 uint 0x103
              aid 0x0201 (SrvDBState)
                 uint 0x1d6b
              aid 0x0202 (unknown)
                 uint 0x246
              aid 0x0203 (unknown)
                 uint 0x517
              aid 0x0204 (unknown)
                 bool 0x1
              aid 0x0205 (unknown)
                 uint 0x2
          cont 00
> HCI Event: Number of Completed Packets (0x13) plen 5
    handle 11 packets 2
> ACL data: handle 11 flags 0x02 dlen 12
    L2CAP(s): Disconn req: dcid 0x0040 scid 0x0040
< ACL data: handle 11 flags 0x00 dlen 12
    L2CAP(s): Disconn rsp: dcid 0x0040 scid 0x0040
> HCI Event: Number of Completed Packets (0x13) plen 5
    handle 11 packets 1
> HCI Event: Disconn Complete (0x05) plen 4
    status 0x00 handle 11 reason 0x13
    Reason: Remote User Terminated Connection
> HCI Event: Connect Request (0x04) plen 10
    bdaddr 5C:F3:70:66:XX:XX class 0x000000 type ACL
< HCI Command: Accept Connection Request (0x01|0x0009) plen 7
    bdaddr 5C:F3:70:66:XX:XX role 0x00
    Role: Master
> HCI Event: Command Status (0x0f) plen 4
    Accept Connection Request (0x01|0x0009) status 0x00 ncmd 1
> HCI Event: Role Change (0x12) plen 8
    status 0x00 bdaddr 5C:F3:70:66:XX:XX role 0x00
    Role: Master
> HCI Event: Connect Complete (0x03) plen 11
    status 0x00 handle 12 bdaddr 5C:F3:70:66:XX:XX type ACL encrypt 0x00
< HCI Command: Read Remote Supported Features (0x01|0x001b) plen 2
    handle 12
> HCI Event: Command Status (0x0f) plen 4
    Read Remote Supported Features (0x01|0x001b) status 0x00 ncmd 1
> HCI Event: Max Slots Change (0x1b) plen 3
    handle 12 slots 5
> HCI Event: Read Remote Supported Features (0x0b) plen 11
    status 0x00 handle 12
    Features: 0xbf 0xfe 0xcf 0xfe 0xdb 0xff 0x7b 0x87
< HCI Command: Read Remote Extended Features (0x01|0x001c) plen 3
    handle 12 page 1
> HCI Event: Command Status (0x0f) plen 4
    Read Remote Extended Features (0x01|0x001c) status 0x00 ncmd 1
> HCI Event: Read Remote Extended Features (0x23) plen 13
    status 0x00 handle 12 page 1 max 1
    Features: 0x03 0x00 0x00 0x00 0x00 0x00 0x00 0x00
< HCI Command: Remote Name Request (0x01|0x0019) plen 10
    bdaddr 5C:F3:70:66:XX:XX mode 2 clkoffset 0x0000
< ACL data: handle 12 flags 0x00 dlen 10
    L2CAP(s): Info req: type 2
> HCI Event: Command Status (0x0f) plen 4
    Remote Name Request (0x01|0x0019) status 0x00 ncmd 1
> HCI Event: Remote Name Req Complete (0x07) plen 255
    status 0x00 bdaddr 5C:F3:70:66:XX:XX name 'raspberrypi'
> HCI Event: Link Key Request (0x17) plen 6
    bdaddr 5C:F3:70:66:XX:XX
< HCI Command: Link Key Request Reply (0x01|0x000b) plen 22
    bdaddr 5C:F3:70:66:XX:XX key 839802CBF65CA6D1D864F91831A288B0
> HCI Event: Command Complete (0x0e) plen 10
    Link Key Request Reply (0x01|0x000b) ncmd 1
    status 0x00 bdaddr 5C:F3:70:66:XX:XX
> HCI Event: Encrypt Change (0x08) plen 4
    status 0x00 handle 12 encrypt 0x01
> ACL data: handle 12 flags 0x02 dlen 10
    L2CAP(s): Info req: type 2
< ACL data: handle 12 flags 0x00 dlen 16
    L2CAP(s): Info rsp: type 2 result 0
      Extended feature mask 0x02b8
        Enhanced Retransmission mode
        Streaming mode
        FCS Option
        Fixed Channels
        Unicast Connectless Data Reception
> ACL data: handle 12 flags 0x02 dlen 16
    L2CAP(s): Info rsp: type 2 result 0
      Extended feature mask 0x02b8
        Enhanced Retransmission mode
        Streaming mode
        FCS Option
        Fixed Channels
        Unicast Connectless Data Reception
< ACL data: handle 12 flags 0x00 dlen 10
    L2CAP(s): Info req: type 3
> HCI Event: Number of Completed Packets (0x13) plen 5
    handle 12 packets 2
> ACL data: handle 12 flags 0x02 dlen 10
    L2CAP(s): Info req: type 3
< ACL data: handle 12 flags 0x00 dlen 20
    L2CAP(s): Info rsp: type 3 result 0
      Fixed channel list 0x00000006
        L2CAP Signalling Channel
        L2CAP Connless
> ACL data: handle 12 flags 0x02 dlen 20
    L2CAP(s): Info rsp: type 3 result 0
      Fixed channel list 0x00000006
        L2CAP Signalling Channel
        L2CAP Connless
> HCI Event: Number of Completed Packets (0x13) plen 5
    handle 12 packets 2
> ACL data: handle 12 flags 0x02 dlen 12
    L2CAP(s): Connect req: psm 15 scid 0x0040
< ACL data: handle 12 flags 0x00 dlen 16
    L2CAP(s): Connect rsp: dcid 0x0040 scid 0x0040 result 1 status 2
      Connection pending - Authorization pending
< ACL data: handle 12 flags 0x00 dlen 16
    L2CAP(s): Connect rsp: dcid 0x0040 scid 0x0040 result 3 status 0
      Connection refused - security block
> HCI Event: Number of Completed Packets (0x13) plen 5
    handle 12 packets 2
> HCI Event: Disconn Complete (0x05) plen 4
    status 0x00 handle 12 reason 0x13
    Reason: Remote User Terminated Connection

No final deste despejo, estou recebendo o erro: "Conexão recusada - bloqueio de segurança". Eu acredito que este é o problema, mas eu tenho os dispositivos confiáveis em ambas as extremidades. Eu recebo este mesmo erro se eu tento usar um gn ou panu como o tipo de servidor e com a conexão dos dispositivos Linux ou Window.

Eu vejo muitos exemplos para o ponto de acesso de rede (NAP), mas estou tendo dificuldades em encontrar exemplos para o grupo ou para a rede panu. Alguém já teve algum sucesso em obter uma rede de grupo ou panu trabalhando usando bt-network (bluez 5.23)? Estou simplesmente sentindo falta de alguma coisa? Qualquer ajuda seria apreciada.

Obrigado

Jon

    
por Jon H 21.01.2016 / 15:35

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