snitest.py

from gi.repository import Gio, GLib

bus = Gio.bus_get_sync(Gio.BusType.SESSION)

info = Gio.DBusNodeInfo.new_for_xml("""
<node name='/'>
  <interface name='org.kde.StatusNotifierItem'>
    <property name="Category" type="s" access="read"/>
    <property name="Id" type="s" access="read"/>
    <property name="Title" type="s" access="read"/>
    <property name="Status" type="s" access="read"/>
    <property name="WindowId" type="i" access="read"/>
    <property name="IconName" type="s" access="read"/>
    <property name="IconPixmap" type="(iiay)" access="read">
    </property>
    <property name="OverlayIconName" type="s" access="read"/>
    <property name="OverlayIconPixmap" type="(iiay)" access="read">
    </property>
    <property name="AttentionIconName" type="s" access="read"/>
    <property name="AttentionIconPixmap" type="(iiay)" access="read">
    </property>
    <property name="AttentionMovieName" type="s" access="read"/>
    <property name="ToolTip" type="(sa(iiay)ss)" access="read">
    </property>
    <method name="ContextMenu">
        <arg name="x" type="i" direction="in"/>
        <arg name="y" type="i" direction="in"/>
    </method>
    <method name="Activate">
        <arg name="x" type="i" direction="in"/>
        <arg name="y" type="i" direction="in"/>
    </method>
    <method name="SecondaryActivate">
        <arg name="x" type="i" direction="in"/>
        <arg name="y" type="i" direction="in"/>
    </method>
    <method name="Scroll">
      <arg name="delta" type="i" direction="in"/>
      <arg name="orientation" type="s" direction="in"/>
    </method>
    <signal name="NewTitle">
    </signal>
    <signal name="NewIcon">
    </signal>
    <signal name="NewAttentionIcon">
    </signal>
    <signal name="NewOverlayIcon">
    </signal>
    <signal name="NewToolTip">
    </signal>
    <signal name="NewStatus">
      <arg name="status" type="s"/>
    </signal>
  </interface>
</node>
""")

def get_property(connection, sender, object_path, interface_name, property_name):
    if property_name in {"Category", "Id", "Status", "IconName"}:
        return GLib.Variant("s", {
            "Category": "Hardware",
            "Id": "blueman",
            "Status": "Active",
            "IconName": "blueman",
            "Title": "A simple title",
        }.get(property_name))
    if property_name == "ToolTip":
        return GLib.Variant("(sa(iiay)ss)", ("", [], "Tooltip title", "<b>Bold tooltip decription</b>"))

bus.register_object("/org/blueman/sni", info.interfaces[0], lambda *args: print(args), get_property, lambda *args: print(args))

bus.call("org.kde.StatusNotifierWatcher", "/StatusNotifierWatcher", "org.kde.StatusNotifierWatcher", "RegisterStatusNotifierItem", GLib.Variant("(s)", ("/org/blueman/sni",)), GLib.VariantType("(s)"), Gio.DBusCallFlags.NONE, -1, None)

GLib.MainLoop().run()