On Thu, Jan 2, 2020 at 6:29 PM Peter Belau <pbelau1@xxxxxxxxx> wrote: > > I don't have any trouble getting reads off the device with the > supplied Android app. As I mentioned these connection troubles seem to > be ubiquitous with BlueZ. This particular device initiates a read > through an Android app, so it seems logical that I would need to send > it something in order to initiate a read, although I'm not entirely > sure how I would figure out what that something is. I've tried to do > reads off of push-button devices but those appear to be even more > reliable (at least this device connects somewhat reliably -- the > others crap out even earlier). The android app might be doing all sorts of things, though you could try cloning its services and pretend to be the device, that way you would see exactly what the app is doing, just remember to connect the app with BlueZ not the real device. For cloning you will need to: bluetoothctl> connect <device address> bluetoothctl> gatt.clone Then proceed to connect to BlueZ, it will forward any request for the services cloned to the real device then just use btmon to investigate what it is sending to replicate. > On Thu, Jan 2, 2020 at 8:20 PM Luiz Augusto von Dentz > <luiz.dentz@xxxxxxxxx> wrote: > > > > Hi Peter, > > > > On Thu, Jan 2, 2020 at 6:10 PM Peter Belau <pbelau1@xxxxxxxxx> wrote: > > > > > > hci trace doesn't give me much of anything although I'd be happy to > > > attach the trace. Which 'spec' should I check here? > > > > https://www.bluetooth.org/docman/handlers/DownloadDoc.ashx?doc_id=243126 > > > > It doesn't look like there is anything required to subscribe but > > perhaps it is disconnecting because there is no measurement in > > progress or you have to set the time via CTS. > > > > > On Thu, Jan 2, 2020 at 8:04 PM Luiz Augusto von Dentz > > > <luiz.dentz@xxxxxxxxx> wrote: > > > > > > > > Hi Peter, > > > > > > > > On Thu, Jan 2, 2020 at 5:58 PM Peter Belau <pbelau1@xxxxxxxxx> wrote: > > > > > > > > > > Thank you very much for the response; I did not realize that > > > > > 'indicate' was exclusive to doing an attribute read. However, "notify > > > > > on" doesn't seem to help. The device disconnects after a read and now > > > > > I can no longer connect to it at all: > > > > > > > > > > QardioARM:/service0400/char0410]# notify on > > > > > Notify started > > > > > [CHG] Device 5C:D6:1F:0E:0A:7D ServicesResolved: no > > > > > [CHG] Device 5C:D6:1F:0E:0A:7D Connected: no > > > > > > > > > > [bluetooth]# connect 5C:D6:1F:0E:0A:7D > > > > > > > > > > > > > > > Attempting to connect to 5C:D6:1F:0E:0A:7D > > > > > Failed to connect: org.bluez.Error.Failed > > > > > > > > > > > > > > > On the bluetoothd side I'm seeing: > > > > > > > > > > bluetoothd[20426]: src/agent.c:agent_disconnect() Agent :1.626 disconnected > > > > > bluetoothd[20426]: src/agent.c:remove_default_agent() Default agent cleared > > > > > bluetoothd[20426]: src/adapter.c:set_mode() sending set mode command for index 0 > > > > > bluetoothd[20426]: src/agent.c:agent_destroy() agent :1.626 > > > > > bluetoothd[20426]: src/agent.c:agent_unref() 0x55e718787df0: ref=0 > > > > > bluetoothd[20426]: src/adapter.c:new_settings_callback() Settings: 0x00000a01 > > > > > bluetoothd[20426]: src/adapter.c:settings_changed() Changed settings: 0x00000010 > > > > > bluetoothd[20426]: src/adapter.c:settings_changed() Pending settings: 0x00000000 > > > > > bluetoothd[20426]: src/agent.c:add_default_agent() Default agent set > > > > > to :1.627 /org/bluez/agent > > > > > bluetoothd[20426]: src/adapter.c:set_mode() sending set mode command for index 0 > > > > > bluetoothd[20426]: src/agent.c:agent_ref() 0x55e7187b7a00: ref=1 > > > > > bluetoothd[20426]: src/agent.c:register_agent() agent :1.627 > > > > > bluetoothd[20426]: src/adapter.c:new_settings_callback() Settings: 0x00000a11 > > > > > bluetoothd[20426]: src/adapter.c:settings_changed() Changed settings: 0x00000010 > > > > > bluetoothd[20426]: src/adapter.c:settings_changed() Pending settings: 0x00000000 > > > > > bluetoothd[20426]: src/device.c:att_connect_cb() connect error: > > > > > Connection refused (111) > > > > > > > > > > I should note that I've tried a number of BTLE blood pressure devices > > > > > with a variety of BT controllers and Bluez cannot seem to maintain > > > > > reliable connections with any of the configurations I've tried. Any > > > > > help would be much appreciated. > > > > > > > > HCI trace would probably help here, you can collect it using btmon. > > > > Have you check the spec if there are other steps before subscribing? > > > > > > > > > On Thu, Jan 2, 2020 at 7:30 PM Luiz Augusto von Dentz > > > > > <luiz.dentz@xxxxxxxxx> wrote: > > > > > > > > > > > > Hi Peter, > > > > > > > > > > > > On Thu, Jan 2, 2020 at 5:22 PM Peter Belau <pbelau1@xxxxxxxxx> wrote: > > > > > > > > > > > > > > I'm trying to get a Qardio ARM BP monitor working with Linux/Bluez but > > > > > > > cannot seem to read any device characteristics with Bluez. My > > > > > > > interaction through bluetoothctl looks like this: > > > > > > > > > > > > > > # menu gatt > > > > > > > # attribute-info 00002a35-0000-1000-8000-00805f9b34fb > > > > > > > Characteristic - Blood Pressure Measurement > > > > > > > UUID: 00002a35-0000-1000-8000-00805f9b34fb > > > > > > > Service: /org/bluez/hci0/dev_B0_49_5F_02_B5_61/service0400 > > > > > > > Value: > > > > > > > 16 7f 00 49 00 5b 00 00 00 00 00 00 00 00 35 00 ...I.[........5. > > > > > > > 00 00 .. > > > > > > > Notifying: no > > > > > > > Flags: indicate > > > > > > > # select-attribute 00002a35-0000-1000-8000-00805f9b34fb > > > > > > > # read > > > > > > > # Attempting to read /org/bluez/hci0/dev_B0_49_5F_02_B5_61/service0400/char0410 > > > > > > > Failed to read: org.bluez.Error.Failed > > > > > > > > > > > > > > I have bluetoothd running with debug flags but nothing appears in the > > > > > > > debug logs. What am I doing wrong? > > > > > > > > > > > > Look at the flags, it only has indicate so it doesn't support reading directly. > > > > > > > > > > > > -- > > > > > > Luiz Augusto von Dentz > > > > > > > > > > > > > > > > -- > > > > Luiz Augusto von Dentz > > > > > > > > -- > > Luiz Augusto von Dentz -- Luiz Augusto von Dentz
