Get support for dual-mode devices

[zalexua]

Related discussions:
hbldh/bleak#701
bluez/bluez#511

Here how it looks like:

$ ble-serial -vv -d 98:DA:E0:01:9C:46 -s 0000ffe0-0000-1000-8000-00805f9b34fb -r 0000ffe1-0000-1000-8000-00805f9b34fb -w 0000ffe2-0000-1000-8000-00805f9b34fb
20:29:43.328 | DEBUG | main.py: Running: Namespace(verbose=2, timeout=5.0, adapter='hci0', mtu=20, device='98:DA:E0:01:9C:46', addr_type='public', service_uuid='0000ffe0-0000-1000-8000-00805f9b34fb', write_uuid='0000ffe2-0000-1000-8000-00805f9b34fb', read_uuid='0000ffe1-0000-1000-8000-00805f9b34fb', mode='rw', filename=None, binlog=False, port='/tmp/ttyBLE', tcp_host='127.0.0.1', tcp_port=None)
20:29:43.329 | DEBUG | selector_events.py: Using selector: EpollSelector
20:29:43.329 | INFO | linux_pty.py: Port endpoint created on /tmp/ttyBLE -> /dev/pts/8
20:29:43.329 | INFO | ble_interface.py: Receiver set up
20:29:43.361 | DEBUG | manager.py: initial properties: {'/org/bluez': {'org.freedesktop.DBus.Introspectable': {}, 'org.bluez.AgentManager1': {}, 'org.bluez.ProfileManager1': {}}, '/org/bluez/hci0': {'org.freedesktop.DBus.Introspectable': {}, 'org.bluez.Adapter1': {'Address': '00:21:6B:E8:4F:5D', 'AddressType': 'public', 'Name': 'it0', 'Alias': 'it0', 'Class': 8126732, 'Powered': True, 'Discoverable': False, 'DiscoverableTimeout': 180, 'Pairable': True, 'PairableTimeout': 0, 'Discovering': False, 'UUIDs': ['00001133-0000-1000-8000-00805f9b34fb', '0000110e-0000-1000-8000-00805f9b34fb', '00001105-0000-1000-8000-00805f9b34fb', '00001132-0000-1000-8000-00805f9b34fb', '00001200-0000-1000-8000-00805f9b34fb', '00001104-0000-1000-8000-00805f9b34fb', '00005005-0000-1000-8000-0002ee000001', '00001108-0000-1000-8000-00805f9b34fb', '0000110c-0000-1000-8000-00805f9b34fb', '00001801-0000-1000-8000-00805f9b34fb', '0000112f-0000-1000-8000-00805f9b34fb', '0000180a-0000-1000-8000-00805f9b34fb', '0000110b-0000-1000-8000-00805f9b34fb', '00001800-0000-1000-8000-00805f9b34fb', '0000111f-0000-1000-8000-00805f9b34fb', '0000110a-0000-1000-8000-00805f9b34fb', '00001106-0000-1000-8000-00805f9b34fb'], 'Modalias': 'usb:v1D6Bp0246d0540', 'Roles': ['central', 'peripheral']}, 'org.freedesktop.DBus.Properties': {}, 'org.bluez.GattManager1': {}, 'org.bluez.Media1': {}, 'org.bluez.NetworkServer1': {}, 'org.bluez.LEAdvertisingManager1': {'ActiveInstances': 0, 'SupportedInstances': 5, 'SupportedIncludes': ['appearance', 'local-name']}}, '/org/bluez/hci0/dev_98_DA_E0_01_9C_46': {'org.freedesktop.DBus.Introspectable': {}, 'org.bluez.Device1': {'Address': '98:DA:E0:01:9C:46', 'AddressType': 'public', 'Name': 'ANT-DISPLAY', 'Alias': 'ANT-DISPLAY', 'Appearance': 2, 'Icon': 'unknown', 'Paired': False, 'Trusted': False, 'Blocked': False, 'LegacyPairing': False, 'Connected': False, 'UUIDs': ['00001101-0000-1000-8000-00805f9b34fb', '00001800-0000-1000-8000-00805f9b34fb', '00001801-0000-1000-8000-00805f9b34fb', '0000180a-0000-1000-8000-00805f9b34fb', '0000ffe0-0000-1000-8000-00805f9b34fb'], 'Modalias': 'bluetooth:v000Ep3412d6701', 'Adapter': '/org/bluez/hci0', 'ManufacturerData': {0: bytearray(b'\x98\xda\xe0\x01\x9cF')}, 'ServicesResolved': False}, 'org.freedesktop.DBus.Properties': {}}}
20:29:43.483 | DEBUG | manager.py: received D-Bus signal: org.freedesktop.DBus.Properties.PropertiesChanged (/org/bluez/hci0): ['org.bluez.Adapter1', {'Discovering': <dbus_fast.signature.Variant ('b', True)>}, []]
20:29:43.506 | DEBUG | manager.py: received D-Bus signal: org.freedesktop.DBus.ObjectManager.InterfacesAdded (/): ['/org/bluez/hci0/dev_65_56_10_1E_F6_BE', {'org.freedesktop.DBus.Introspectable': {}, 'org.bluez.Device1': {'Address': <dbus_fast.signature.Variant ('s', 65:56:10:1E:F6:BE)>, 'AddressType': <dbus_fast.signature.Variant ('s', public)>, 'Name': <dbus_fast.signature.Variant ('s', ANT-BMS-BLE)>, 'Alias': <dbus_fast.signature.Variant ('s', ANT-BMS-BLE)>, 'Paired': <dbus_fast.signature.Variant ('b', False)>, 'Trusted': <dbus_fast.signature.Variant ('b', False)>, 'Blocked': <dbus_fast.signature.Variant ('b', False)>, 'LegacyPairing': <dbus_fast.signature.Variant ('b', False)>, 'RSSI': <dbus_fast.signature.Variant ('n', -41)>, 'Connected': <dbus_fast.signature.Variant ('b', False)>, 'UUIDs': <dbus_fast.signature.Variant ('as', ['0000ffe0-0000-1000-8000-00805f9b34fb', '0000fee7-0000-1000-8000-00805f9b34fb'])>, 'Adapter': <dbus_fast.signature.Variant ('o', /org/bluez/hci0)>, 'ManufacturerData': <dbus_fast.signature.Variant ('a{qv}', {54702: <dbus_fast.signature.Variant ('ay', bytearray(b'\x88\xa0eV\x10\x1d\xf6\xbe'))>})>, 'ServicesResolved': <dbus_fast.signature.Variant ('b', False)>}, 'org.freedesktop.DBus.Properties': {}}]
20:29:43.562 | DEBUG | manager.py: received D-Bus signal: org.freedesktop.DBus.ObjectManager.InterfacesAdded (/): ['/org/bluez/hci0/dev_98_DA_E0_01_9C_46', {'org.freedesktop.DBus.Introspectable': {}, 'org.bluez.Device1': {'Address': <dbus_fast.signature.Variant ('s', 98:DA:E0:01:9C:46)>, 'AddressType': <dbus_fast.signature.Variant ('s', public)>, 'Name': <dbus_fast.signature.Variant ('s', ANT-DISPLAY)>, 'Alias': <dbus_fast.signature.Variant ('s', ANT-DISPLAY)>, 'Paired': <dbus_fast.signature.Variant ('b', False)>, 'Trusted': <dbus_fast.signature.Variant ('b', False)>, 'Blocked': <dbus_fast.signature.Variant ('b', False)>, 'LegacyPairing': <dbus_fast.signature.Variant ('b', False)>, 'RSSI': <dbus_fast.signature.Variant ('n', -61)>, 'Connected': <dbus_fast.signature.Variant ('b', False)>, 'UUIDs': <dbus_fast.signature.Variant ('as', ['0000ffe0-0000-1000-8000-00805f9b34fb'])>, 'Adapter': <dbus_fast.signature.Variant ('o', /org/bluez/hci0)>, 'ManufacturerData': <dbus_fast.signature.Variant ('a{qv}', {0: <dbus_fast.signature.Variant ('ay', bytearray(b'\x98\xda\xe0\x01\x9cF'))>})>, 'ServicesResolved': <dbus_fast.signature.Variant ('b', False)>}, 'org.freedesktop.DBus.Properties': {}}]
20:29:43.576 | DEBUG | manager.py: received D-Bus signal: org.freedesktop.DBus.Properties.PropertiesChanged (/org/bluez/hci0/dev_98_DA_E0_01_9C_46): ['org.bluez.Device1', {}, ['RSSI']]
20:29:43.577 | DEBUG | manager.py: received D-Bus signal: org.freedesktop.DBus.Properties.PropertiesChanged (/org/bluez/hci0/dev_65_56_10_1E_F6_BE): ['org.bluez.Device1', {}, ['RSSI']]
20:29:43.577 | DEBUG | manager.py: received D-Bus signal: org.freedesktop.DBus.Properties.PropertiesChanged (/org/bluez/hci0): ['org.bluez.Adapter1', {'Discovering': <dbus_fast.signature.Variant ('b', False)>}, []]
20:29:43.578 | INFO | ble_interface.py: Trying to connect with 98:DA:E0:01:9C:46: ANT-DISPLAY
20:29:43.579 | DEBUG | client.py: Connecting to device @ 98:DA:E0:01:9C:46
20:29:43.583 | DEBUG | client.py: Connecting to BlueZ path /org/bluez/hci0/dev_98_DA_E0_01_9C_46
20:29:46.487 | DEBUG | manager.py: received D-Bus signal: org.freedesktop.DBus.Properties.PropertiesChanged (/org/bluez/hci0/dev_98_DA_E0_01_9C_46): ['org.bluez.Device1', {'Connected': <dbus_fast.signature.Variant ('b', True)>}, []]
20:29:46.555 | DEBUG | manager.py: received D-Bus signal: org.freedesktop.DBus.Properties.PropertiesChanged (/org/bluez/hci0/dev_98_DA_E0_01_9C_46): ['org.bluez.Device1', {'UUIDs': <dbus_fast.signature.Variant ('as', ['00001101-0000-1000-8000-00805f9b34fb'])>, 'ServicesResolved': <dbus_fast.signature.Variant ('b', True)>}, []]
20:29:47.465 | DEBUG | manager.py: received D-Bus signal: org.freedesktop.DBus.ObjectManager.InterfacesAdded (/): ['/org/bluez/agent', {'org.freedesktop.DBus.Introspectable': {}, 'org.bluez.Agent1': {}}]
20:29:47.467 | DEBUG | manager.py: received D-Bus signal: org.freedesktop.DBus.ObjectManager.InterfacesRemoved (/): ['/org/bluez/agent', ['org.freedesktop.DBus.Introspectable', 'org.bluez.Agent1']]
20:29:49.443 | DEBUG | manager.py: received D-Bus signal: org.freedesktop.DBus.Properties.PropertiesChanged (/org/bluez/hci0/dev_98_DA_E0_01_9C_46): ['org.bluez.Device1', {'ServicesResolved': <dbus_fast.signature.Variant ('b', False)>}, []]
20:29:49.444 | DEBUG | client.py: _cleanup_all(/org/bluez/hci0/dev_98_DA_E0_01_9C_46)
20:29:49.444 | ERROR | main.py: Bluetooth connection failed: [org.bluez.Error.NotAvailable] br-connection-profile-unavailable
20:29:49.444 | WARNING | main.py: Shutdown initiated
20:29:49.444 | INFO | linux_pty.py: Serial reader and symlink removed
20:29:49.444 | INFO | main.py: Shutdown complete.

I tried to inspect and understand this library code and Bleak's code too and this output too.
So, the code searches BLE ADDR and fount it, as it should, but then it connects to the device using BR/EDR transport, and eventually fails as it could find "0000ffe0-..." UUID.

Instead it shows UUID "00001101-0000-1000-8000-00805f9b34fb" which is well knows SPP for the Classic BT.

I watched by btmon tool what happens, and it's clear it uses BR/EDR to connect after discovering the device by BLE:

....
@ MGMT Event: Discovering (0x0013) plen 2                                                                                                                                                                                          {0x0001} [hci0] 6.921850
        Address type: 0x06
          LE Public
          LE Random
        Discovery: Disabled (0x00)
< HCI Command: Create Connection (0x01|0x0005) plen 13                                                                                                                                                                                  #13 [hci0] 6.931115
        Address: 98:DA:E0:01:9C:46 (OUI 98-DA-E0)
        Packet type: 0xcc18
          DM1 may be used
          DH1 may be used
          DM3 may be used
          DH3 may be used
          DM5 may be used
          DH5 may be used
        Page scan repetition mode: R2 (0x02)
        Page scan mode: Mandatory (0x00)
        Clock offset: 0x0000
        Role switch: Allow peripheral (0x01)
@ MGMT Command: Add Device (0x0033) plen 8                                                                                                                                                                                         {0x0001} [hci0] 6.931186
        BR/EDR Address: 98:DA:E0:01:9C:46 (OUI 98-DA-E0)
        Action: Allow incoming connection (0x01)
@ MGMT Event: Device Flags Changed (0x002a) plen 15                                                                                                                                                                                {0x0001} [hci0] 6.931194
        BR/EDR Address: 98:DA:E0:01:9C:46 (OUI 98-DA-E0)
        Supported Flags: 0x00000001
          Remote Wakeup
        Current Flags: 0x00000000
@ MGMT Event: Command Complete (0x0001) plen 10                                                                                                                                                                                    {0x0001} [hci0] 6.931198
      Add Device (0x0033) plen 7
        Status: Success (0x00)
        BR/EDR Address: 98:DA:E0:01:9C:46 (OUI 98-DA-E0)
> HCI Event: Command Status (0x0f) plen 4                                                                                                                                                                                               #14 [hci0] 6.931669
      Create Connection (0x01|0x0005) ncmd 1
        Status: Success (0x00)
< HCI Command: Write Scan Enable (0x03|0x001a) plen 1                                                                                                                                                                                   #15 [hci0] 6.931680
        Scan enable: Page Scan (0x02)
> HCI Event: Command Complete (0x0e) plen 4                                                                                                                                                                                             #16 [hci0] 6.932666
      Write Scan Enable (0x03|0x001a) ncmd 2
        Status: Success (0x00)
> HCI Event: Connect Complete (0x03) plen 11                                                                                                                                                                                            #17 [hci0] 7.316751
        Status: Success (0x00)
        Handle: 256
        Address: 98:DA:E0:01:9C:46 (OUI 98-DA-E0)
        Link type: ACL (0x01)
        Encryption: Disabled (0x00)
< HCI Command: Read Remote Supported Features (0x01|0x001b) plen 2                                                                                                                                                                      
...

I'm not sure what to do here, just raising this discussion here to possibly find some solution.