Hi Yunhan On Mon, Aug 7, 2017 at 9:18 AM, Yunhan Wang <yunhanw@xxxxxxxxxxxx> wrote: > Hi Luiz, > > Do you have any idea about this issue? > > Best wishes > Yunhan > > On Sun, Aug 6, 2017 at 1:25 AM, Yunhan Wang <yunhanw@xxxxxxxxxxxx> wrote: >> Hi >> >> Has any one been able to send notification from LE peripheral to LE >> central using bluetoothctl? >> >> Now I am trying to update "Value" with 0x02 for the below >> characteristic with read and indicate flag, i am expecting a >> notification can be sent from peripheral to central automatically. It >>seems there is no such support in bluetoothctl. Then I do simple code >> change on below, and try to update value via "update-chrc 0x02", well, >> the value has been successfully updated, but there is no >> message/notification sent from peripheral to central automatically. I >> have confirmed that chrc read from central is showing updated value, >> 02, correctly. The question is that how can we send characteristic >> notification/indication using bluez dbus API? That is up for the application when to generate Value changes, we can introduce a command to just do that, though using bluetoothctl to generate notification is not very user friendly. bluetoothd will notice if the application had update its Value, but in order for this to work you have to generate the PropertiesChanged signal. >> btw, I see the video(BlueZ Meets Zephyr made by Luiz) >> https://www.youtube.com/watch?v=SdmZX5q-XDg >> In 30:05, I see Zephyr is sending notification to bluetoothctl >> automatically.How can we just use bluez dbus API to achieve this? That is using HRS and emulating the heart rate measurements. >> for example, >> In LE peripheral: >> I setup the below characteristic with read and indicate flag >> register-service 00001820-0000-1000-8000-00805f9b34fb >> register-characteristic 00002a06-0000-1000-8000-00805f9b34fb read,indicate >> register-application >> advertise peripheral >> >> In LE central: >> connect 00:AA:01:00:00:23 >> select-attribute /org/bluez/hci1/dev_00_AA_01_00_00_23/service000a/char000b >> notify on >> >> The code change snippet >> --- a/client/gatt.c >> +++ b/client/gatt.c >> -void gatt_register_chrc(DBusConnection *conn, GDBusProxy *proxy, wordexp_t *w) >> +void chrc_set_value1(const char *input, void *user_data, DBusConnection *conn) >> +{ >> + struct chrc *chrc = user_data; >> + >> + g_free(chrc->value); >> + >> + chrc->value = str2bytearray((char *) input, &chrc->value_len); >> + g_dbus_emit_property_changed(conn, chrc->path, >> "org.bluez.GattCharacteristic1", "Value"); >> + >> +} >> +struct chrc * gatt_register_chrc(DBusConnection *conn, GDBusProxy >> *proxy, wordexp_t *w) >> { >> struct service *service; >> struct chrc *chrc; >> @@ -1489,6 +1500,8 @@ void gatt_register_chrc(DBusConnection *conn, >> GDBusProxy *proxy, wordexp_t *w) >> print_chrc(chrc, COLORED_NEW); >> >> rl_prompt_input(chrc->path, "Enter value:", chrc_set_value, chrc); >> + >> + return chrc; >> } >> >> --- a/client/main.c >> +++ b/client/main.c >> +static void cmd_update_chrc(const char *arg) >> +{ >> + chrc_set_value1(arg, default_chrc, dbus_conn); Where does default_chrc comes from? I guess we would need some way to select the server attributes in order to update them, again this is not going to be user friendly since you have to send the notification one by one. Perhaps an easier way to test this is to register standard attributes like HRS and enable simulation, so it would act exactly like zephyr or out example-gatt-server. This could perhaps be done automatically in case a know service is registered without any attributes, e.g: HRS, then by the time we register the application bluetoothctl would take care of registering the standard attributes for the service. >> + >> +} >> + >> static void cmd_unregister_characteristic(const char *arg) >> { >> wordexp_t w; >> @@ -2541,6 +2547,9 @@ static const struct { >> { "register-characteristic", "<UUID> <Flags=read,write,notify...>", >> cmd_register_characteristic, >> "Register application characteristic" }, >> + { "update-chrc", "<value.>", >> + cmd_update_chrc, >> + "update chrc value" }, >> >> Thanks >> Best wishes >> Yunhan > -- >To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Luiz Augusto von Dentz -- To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
