BLE Advertisement frustrations with pydbus

[Travis Griggs <travisgriggs@xxxxxxxxx>]

I’m trying to switch to using pydbus (instead of deprecated dbus-python, which the bluez examples are based on). I’m running on stretch with bluez 5.43. My code is at the bottom (and here -> https://gist.github.com/travisgriggs/d8e14dcccf46751804456dc74da1e5e6). I’m running into a problem when I try to RegisterAdvertisement. What I can’t seem to discern is what is different between this and the old approach. The bluetooth driver fails around advertising:c:175

    DBusMessageIter iter;
    const char *msg_type;

    if (!g_dbus_proxy_get_property(proxy, "Type", &iter))
        return false;

The g_dbus_proxy_get_property() call fails. What I don’t understand though is this. If I modify my program to NOT RegisterAdvertisement(), but just sit there with the advertisement object on the bus, I can do the following:

$ sudo busctl get-property :1.5 /nic/twigpilot org.bluez.LEAdvertisement1 Type
s “peripheral"

So I *am* able to get the Type using busctl. Why is that bluetoothd cannot? Using busctl introspect, I see that the pydbus variant automagically makes a lot more available than the dubs-python variant did.

Any hints? Pointers? Help?

TIA

——

#!/usr/bin/env python3

import pydbus
from gi.repository import GLib

class Advertisement(object):
    """
      <node>
        <interface name="org.bluez.LEAdvertisement1">
          <method name="Release">
            <annotation name="org.freedesktop.DBus.Method.NoReply" value="true"/>
          </method>
          <annotation name="org.freedesktop.DBus.Properties.PropertiesChanged" value="const"/>
          <property name="Type" type="s" access="read"/>
          <property name="ServiceUUIDs" type="as" access="read"/>
          <property name="ManufacturerData" type="a{sv}" access="read"/>
          <property name="SolicitUUIDs" type="as" access="read"/>
          <property name="ServiceData" type="a{sv}" access="read"/>
          <property name="IncludeTxPower" type="b" access="read"/>
        </interface>
      </node>
    """

    def __init__(self, bus):
        self.Type = 'peripheral'
        self.ServiceUUIDs = []
        self.ManufacturerData = {}
        self.SolicitUUIDs = []
        self.ServiceData = {}
        self.IncludeTxPower = False
        bus.register_object('/nic/twigpilot', self, None)

    def Release(self):
        print('{}: Advertisement Released!'.format(self))


def main():
    bus = pydbus.SystemBus()
    adaptor = bus.get('org.bluez', '/org/bluez/hci0')
    adaptor.Powered = True
    adaptor.Alias = 'SeeMe'

    advertisement = Advertisement(bus)
    advertisement.IncludeTxPower = True

    #adaptor.RegisterAdvertisement('/nic/twigpilot', {})

    loop = GLib.MainLoop()
    try:
        loop.run()
    except KeyboardInterrupt:
        loop.quit()

if __name__ == '__main__':
    main()--
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