Using iOS GameKit's “Bluetooth Bonjour” with other platforms

I’m interested in connecting to iOS-based devices over Bluetooth. I can see that the “Local Network” service is exposed, but I cannot find any extra information about it. Property stored under key 0x0204 looks like a Bonjour key.

Which protocol is used? How can one talk to the iOS device using Linux, Mac or one’s own embedded device equipped with a Bluetooth chip?

  • Central writing characteristic to Peripheral (iOS Core Bluetooth)
  • What is AWDL (Apple Wireless Direct Link) and how does it work?
  • iOS iBeacon / Bluetooth connectivity when app is dead and gone
  • Finding generic Bluetooth devices within reach
  • NSPredicate in showBluetoothAccessoryPickerWithNameFilter
  • iOS receive data from bluetooth and then send information to a database on another server through wi-fi
  • Here’s SDP data extracted using Bluetooth Explorer under OS X while the iOS device runs Gameloft’s Star Battalion.

        {
            0x0000 = uint32(1330188565),
            0x0200 = uint32(2),
            0x0202 = string(004wD7l1A..0|0|0|ivucic-À'),
            0x030a = uint32(0),
            0x0009 = { { uuid16(11 15), uint16(256) } },
            0x0201 = string(_657o30a6rmst07À),
            0x0005 = { uuid16(10 02) },
            0x0100 = string(Local Network),
            0x0001 = { uuid16(11 15) },
            0x0203 = string(004wd7l1a..0|0|0|ivucic-_657o30a6rmst07À
            0xf000 = uint8(2),
            0x0204 = string(    txtvers=1state=A),
            0x0008 = uint8(255),
            0x0006 = { uint16(25966), uint16(106), uint16(256), uint16(26226), uint16(106), uint16(272), uint16(25701), uint16(106), uint16(288), uint16(27233), uint16(106), uint16(304) },
            0x0004 = { { uuid16(01 00), uint16(15) }, { uuid16(00 0f), uint16(256), { uint16(2048), uint16(2054) } } },
            0x0002 = uint32(0)
        },
    

    Other partially relevant questions:

    • PAN with Linux, iOS, Bluetooth, Bonjour, GameKit — Possible? – Person can solve problem using Wi-Fi. Not solution here because embedded device will not have the way more expensive Wi-Fi chip.
    • Bonjour over bluetooth WITHOUT Gamekit? – Best answer does not end up providing technical details
    • iOS bluetooth without GameKit – Provides a solution for a jailbroken device, which is not applicable here.

    Researching further with Apple’s Bluetooth Explorer in OS X and sdptool in GNU/Linux, I have discovered that key 0x0001 (standing for “protocol class”), containing value of 0x1115, stands for the “PANU” variant of “PAN” – a peer2peer variant. It is notable that OS X does not provide service-side (‘hosting’) support for this protocol, despite supporting creation of a 0x1116 network, which is the “NAP” variant of “PAN” – a client/server variant.

    This might be good news, but only if GameKit’s session protocol does not have to be used. Hijacking the media-layer connection established by GameKit in order to send other UDP traffic would be ideal.

    I’ll still have to research whether or not this GameKit connection really is 0x1115; that is, if it really is “PANU”. Does anyone have any further information?


    Note while Bonjour automatically announced this Bluetooth service after iOS 3, this has changed with iOS 5. See the answer I posted on how to establish Bluetooth connection without GameKit, where I handily documented information from Apple’s Technical Q&A QA1753.


    A small amount of research with GNU/Linux did not result in a successful connection. It may be due to lack of knowledge on how to properly use pand. It may also be due to Bluetooth MAC based blocking. I’d love info anyone may have to offer. If I research this further and stumble upon something interesting, I’ll update this answer.


    Results under Ubuntu. The service appears only when Bluetooth Bonjour is active.

    ivucica@ivucica-MacBook:~$ sdptool browse $ADDR #relevant data only
    Browsing ADDRESS_HERE ...
    Service Name: Local Network
    Service RecHandle: 0x4f491115
    Service Class ID List:
      "PAN User" (0x1115)
    Protocol Descriptor List:
      "L2CAP" (0x0100)
        PSM: 15
      "BNEP" (0x000f)
        Version: 0x0100
        SEQ8: 0 6
    Language Base Attr List:
      code_ISO639: 0x656e
      encoding:    0x6a
      base_offset: 0x100
      code_ISO639: 0x6672
      encoding:    0x6a
      base_offset: 0x110
      code_ISO639: 0x6465
      encoding:    0x6a
      base_offset: 0x120
      code_ISO639: 0x6a61
      encoding:    0x6a
      base_offset: 0x130
    Profile Descriptor List:
      "PAN User" (0x1115)
        Version: 0x0100
    
    ... and so on ...
    

    Here’s the attempt to connect:

    ivucica@ivucica-MacBook:~$ pand --connect $ADDR -n
    pand[3237]: Bluetooth PAN daemon version 4.98
    pand[3237]: Connecting to ADDRESS_HERE
    pand[3237]: Connect to ADDRESS_HERE failed. Connection refused(111)
    

    Is some sort of authorization required? Enabling encryption, authentication, secure connection and forcing becoming a master doesn’t seem to make any difference (-AESM options in various combinations).

    Anyone has any ideas?


    Huh!

    ivucica@ivucica-MacBook:~$ sudo hcidump
    HCI sniffer - Bluetooth packet analyzer ver 2.2
    device: hci0 snap_len: 1028 filter: 0xffffffff
     HCI Event: Command Status (0x0f) plen 4
        Create Connection (0x01|0x0005) status 0x00 ncmd 1
    > HCI Event: Role Change (0x12) plen 8
        status 0x00 bdaddr ADDRESS_HERE role 0x01
        Role: Slave
    > HCI Event: Connect Complete (0x03) plen 11
        status 0x00 handle 12 bdaddr ADDRESS_HERE type ACL encrypt 0x00
     HCI Event: Command Status (0x0f) plen 4
        Read Remote Supported Features (0x01|0x001b) status 0x00 ncmd 1
    > HCI Event: Read Remote Supported Features (0x0b) plen 11
        status 0x00 handle 12
        Features: 0xbf 0xfe 0x8f 0xfe 0x9b 0xff 0x79 0x83
     HCI Event: Command Status (0x0f) plen 4
        Read Remote Extended Features (0x01|0x001c) status 0x00 ncmd 1
    > HCI Event: Max Slots Change (0x1b) plen 3
        handle 12 slots 5
    > HCI Event: Read Remote Extended Features (0x23) plen 13
        status 0x00 handle 12 page 1 max 1
        Features: 0x01 0x00 0x00 0x00 0x00 0x00 0x00 0x00
     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 ADDRESS_HERE name 'Evil iPad'
     HCI Event: Command Status (0x0f) plen 4
        Authentication Requested (0x01|0x0011) status 0x00 ncmd 1
    > HCI Event: Link Key Request (0x17) plen 6
        bdaddr ADDRESS_HERE
     HCI Event: Command Complete (0x0e) plen 10
        Link Key Request Reply (0x01|0x000b) ncmd 1
        status 0x00 bdaddr ADDRESS_HERE
    > HCI Event: Auth Complete (0x06) plen 3
        status 0x00 handle 12
     HCI Event: Command Status (0x0f) plen 4
        Set Connection Encryption (0x01|0x0013) status 0x00 ncmd 1
    > HCI Event: Encrypt Change (0x08) plen 4
        status 0x00 handle 12 encrypt 0x01
     HCI Event: Number of Completed Packets (0x13) plen 5
        handle 12 packets 1
    > ACL data: handle 12 flags 0x02 dlen 16
        L2CAP(s): Info rsp: type 2 result 0
          Extended feature mask 0x02a8
            Enhanced Retransmission mode
            FCS Option
            Fixed Channels
            Unicast Connectless Data Reception
     HCI Event: Number of Completed Packets (0x13) plen 5
        handle 12 packets 1
    > 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 1
    > ACL data: handle 12 flags 0x02 dlen 16
        L2CAP(s): Connect rsp: dcid 0x0000 scid 0x0040 result 2 status 0
          Connection refused - PSM not supported
    > HCI Event: Disconn Complete (0x05) plen 4
        status 0x00 handle 12 reason 0x13
        Reason: Remote User Terminated Connection
    

    This?

    > ACL data: handle 12 flags 0x02 dlen 16
        L2CAP(s): Connect rsp: dcid 0x0000 scid 0x0040 result 2 status 0
          Connection refused - PSM not supported
    

    2 Solutions Collect From Internet About “Using iOS GameKit's “Bluetooth Bonjour” with other platforms”

    According to this interesting site :
    http://code.google.com/p/btstack/wiki/iPhoneBluetooth Apple are using a special chip besides their Bluetooth RF chip which denies any connection for a device without that chip – this means its a lock on the hardware level.

    Maybe a bit delayed, but technologies have evolved since so there is certainly new info around which draws fresh light on the matter…

    The traditional GameKit has been replaced by Multiper Connectivity together with introducing support for WiFi Direct on iOS, however the framework still remains iOS only. I assume there is proprietary stuff going on in there.

    Also, as iOS has yet to open up a direct API for WiFi Direct I believe the best way to approach this is to use BLE, which is supported by both platforms (some better than others).

    On iOS a device can act both as a BLE Central and BLE Peripheral at the same time, on Android the situation is more complex as not all devices support the BLE Peripheral state. Also the Android BLE stack is very unstable (to date).

    If your use case is feature driven, I would suggest to look at Frameworks and Libraries that can achieve cross platform communication for you, without you needing to build it up from scratch.

    For example: http://p2pkit.io or google nearby

    Disclaimer: I work for Uepaa, developing p2pkit.io for Android and iOS.