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From:   Barry Byford <31baz66@gmail.com>
Date:   Mon, 1 Jun 2020 08:42:29 +0100
Message-ID: <CAAu3APZLXdgubFVzyF4G3fmnHjzTdmffiC234SCrzUsE_Skuaw@mail.gmail.com>
Subject: Getting ADV_IND and SCAN_RSP data with DBus
To:     Bluez mailing list <linux-bluetooth@vger.kernel.org>
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Hello,

I attempting to get the advertising data from a commercially available
sensor device using the DBus API.
The sensor device gives different manufacturer data depending if the
event type is ADV_IND or SCAN_RSP, as you can see below in the btmon
output.

With DBus I am subscribing to the InterfacesAdded signal which
triggers when the device has been found. However, it only seems to
give me the information for the SCAN_RSP.
If I subscribe to the PropertiesChanged signal on the device, that is
also only giving the data from the SCAN_RSP event.

How do I access both types of data with the DBus API?

Thanks,
Barry

$ bluetoothctl -v
bluetoothctl: 5.50


btmon output for sensor device:

> HCI Event: LE Meta Event (0x3e) plen 43                                                                    #1969 [hci0] 740.157687
      LE Advertising Report (0x02)
        Num reports: 1
        Event type: Connectable undirected - ADV_IND (0x00)
        Address type: Random (0x01)
        Address: DC:76:F7:E1:62:E0 (Static)
        Data length: 31
        Flags: 0x06
          LE General Discoverable Mode
          BR/EDR Not Supported
        Company: Blue Maestro Limited (307)
          Data: 1b640e10010400e701a527f50100
        Name (complete): DC76F7E1
        RSSI: -44 dBm (0xd4)
> HCI Event: LE Meta Event (0x3e) plen 41                                                                    #1970 [hci0] 740.158684
      LE Advertising Report (0x02)
        Num reports: 1
        Event type: Scan response - SCAN_RSP (0x04)
        Address type: Random (0x01)
        Address: DC:76:F7:E1:62:E0 (Static)
        Data length: 29
        Company: Blue Maestro Limited (307)
          Data: 27fd27f227ea0000010201b600e4017100f4018c0000000000
        RSSI: -44 dBm (0xd4)
@ MGMT Event: Device Found (0x0012) plen 74
                                   {0x0002} [hci0] 740.158704
        LE Address: DC:76:F7:E1:62:E0 (Static)
        RSSI: -44 dBm (0xd4)
        Flags: 0x00000000
        Data length: 60
        Flags: 0x06
          LE General Discoverable Mode
          BR/EDR Not Supported
        Company: Blue Maestro Limited (307)
          Data: 1b640e10010400e701a527f50100
        Name (complete): DC76F7E1
        Company: Blue Maestro Limited (307)
          Data: 27fd27f227ea0000010201b600e4017100f4018c0000000000
@ MGMT Event: Device Found (0x0012) plen 74
                                   {0x0001} [hci0] 740.158704
        LE Address: DC:76:F7:E1:62:E0 (Static)
        RSSI: -44 dBm (0xd4)
        Flags: 0x00000000
        Data length: 60
        Flags: 0x06
          LE General Discoverable Mode
          BR/EDR Not Supported
        Company: Blue Maestro Limited (307)
          Data: 1b640e10010400e701a527f50100
        Name (complete): DC76F7E1
        Company: Blue Maestro Limited (307)
          Data: 27fd27f227ea0000010201b600e4017100f4018c0000000000


Device information from the InterfacesAdded DBus signal:

{'Adapter': '/org/bluez/hci0',
 'Address': 'DC:76:F7:E1:62:E0',
 'AddressType': 'random',
 'Alias': 'DC76F7E1',
 'Blocked': False,
 'Connected': False,
 'LegacyPairing': False,
 'ManufacturerData': {307: [39, 253, 39, 242, 39, 234, 0, 0, 1, 2, 1,
182, 0, 228, 1, 113, 0, 244,1, 140, 0, 0, 0, 0, 0]},
 'Name': 'DC76F7E1',
 'Paired': False,
 'RSSI': -51,
 'ServicesResolved': False,
 'Trusted': False,
 'UUIDs': []}

Looking at the propertiesChanged signal on the device, it is also only
showing the same manufacturer data:
org.bluez.Device1 {'RSSI': -45, 'ManufacturerData': {307: [39, 253,
39, 242, 39, 234, 0, 0, 1, 2, 1, 182, 0, 228, 1, 113, 0, 244, 1, 140,
0, 0, 0, 0, 0]}} []
org.bluez.Device1 {'RSSI': -52, 'ManufacturerData': {307: [39, 253,
39, 242, 39, 234, 0, 0, 1, 2, 1, 182, 0, 228, 1, 113, 0, 244, 1, 140,
0, 0, 0, 0, 0]}} []
org.bluez.Device1 {'RSSI': -54, 'ManufacturerData': {307: [39, 253,
39, 242, 39, 234, 0, 0, 1, 2, 1, 182, 0, 228, 1, 113, 0, 244, 1, 140,
0, 0, 0, 0, 0]}} []
org.bluez.Device1 {'RSSI': -45, 'ManufacturerData': {307: [39, 253,
39, 242, 39, 234, 0, 0, 1, 2, 1, 182, 0, 228, 1, 113, 0, 244, 1, 140,
0, 0, 0, 0, 0]}} []
org.bluez.Device1 {'RSSI': -54, 'ManufacturerData': {307: [39, 253,
39, 242, 39, 234, 0, 0, 1, 2, 1, 182, 0, 228, 1, 113, 0, 244, 1, 140,
0, 0, 0, 0, 0]}} []
org.bluez.Device1 {'RSSI': -52, 'ManufacturerData': {307: [39, 253,
39, 242, 39, 234, 0, 0, 1, 2, 1, 182, 0, 228, 1, 113, 0, 244, 1, 140,
0, 0, 0, 0, 0]}} []