Merge pull request #111 from zalexua/develop

Decrease default Advertisement interval from 1200 to 100 ms

bless/backends/bluezdbus/dbus/advertisement.py

@@ -20,6 +20,10 @@ class BlueZLEAdvertisement(ServiceInterface):
     org.bluez.LEAdvertisement1 interface implementation
 
     https://github.com/bluez/bluez/blob/5.64/doc/advertising-api.txt
+    https://python-dbus-next.readthedocs.io/en/latest/type-system/index.html
+    https://elixir.bootlin.com/linux/v5.11/source/include/net/bluetooth/mgmt.h#L794
+    https://github.com/bluez/bluez/issues/527
+    https://patches.linaro.org/project/linux-bluetooth/list/?series=31700
     """
 
     interface_name: str = "org.bluez.LEAdvertisement1"
@@ -50,7 +54,16 @@ def __init__(
         self._solicit_uuids: List[str] = [""]
         self._service_data: Dict = {}
 
-        self._tx_power: int = 20
+        # 3 options below are classified as Experimental in BlueZ and really work only:
+        # - when BlueZ is compiled with such option (usually it is)
+        # - and when "bluetoothd" daemon is started with -E, --experimental option (usually it's not)
+        # They are taken into account only with Kernel v5.11+ and BlueZ v5.65+.
+        # It's a known fact that BlueZ verions 5.63-5.64 have broken Dbus part for LEAdvertisingManager
+        # and do not work properly when the Experimental mode is enabled.
+        self._min_interval: int = 100   # in ms, range [20ms, 10,485s]
+        self._max_interval: int = 100   # in ms, range [20ms, 10,485s]
+        self._tx_power: int = 20        # range [-127 to +20]
+
         self._local_name = app.app_name
 
         self.data = None
@@ -116,6 +129,22 @@ def TxPower(self) -> "n":  # type: ignore # noqa: F821 N802
     def TxPower(self, dbm: "n"):  # type: ignore # noqa: F821 N802
         self._tx_power = dbm
 
+    @dbus_property()
+    def MaxInterval(self) -> "u":  # type: ignore # noqa: F821 N802
+        return self._max_interval
+
+    @MaxInterval.setter  # type: ignore
+    def MaxInterval(self, interval: "u"):  # type: ignore # noqa: F821 N802
+        self._max_interval = interval
+
+    @dbus_property()
+    def MinInterval(self) -> "u":  # type: ignore # noqa: F821 N802
+        return self._min_interval
+
+    @MinInterval.setter  # type: ignore
+    def MinInterval(self, interval: "u"):  # type: ignore # noqa: F821 N802
+        self._min_interval = interval
+
     @dbus_property()
     def LocalName(self) -> "s":  # type: ignore # noqa: F821 N802
         return self._local_name