device: add present flag, unset when internal error occurs, set when notification appears

lib/logitech_receiver/device.py

@@ -147,6 +147,7 @@ class Device:
         self.battery_info = None
         self.link_encrypted = None
         self._active = None  # lags self.online - is used to help determine when to setup devices
+        self.present = True  # used for devices that are integral with their receiver but that separately be disconnected
 
         self._feature_settings_checked = False
         self._gestures_lock = threading.Lock()
@@ -432,6 +433,8 @@ class Device:
     def changed(self, active=None, alert=Alert.NONE, reason=None, push=False):
         """The status of the device had changed, so invoke the status callback.
         Also push notifications and settings to the device when necessary."""
+        if logger.isEnabledFor(logging.DEBUG):
+            logger.debug("device %d changing: active=%s %s present=%s", self.number, active, self._active, self.present)
         if active is not None:
             self.online = active
             was_active, self._active = self._active, active
@@ -533,7 +536,8 @@ class Device:
             return hidpp20.feature_request(self, feature, function, *params, no_reply=no_reply)
 
     def ping(self):
-        """Checks if the device is online, returns True of False"""
+        """Checks if the device is online and present, returns True of False.
+        Some devices are integral with their receiver but may not be present even if the receiver responds to ping."""
         long = self.hidpp_long is True or (
             self.hidpp_long is None and (self.bluetooth or self._protocol is not None and self._protocol >= 2.0)
         )
@@ -542,9 +546,11 @@ class Device:
             protocol = self.low_level.ping(handle, self.number, long_message=long)
         except exceptions.NoReceiver:  # if ping fails, device is offline
             protocol = None
-        self.online = protocol is not None
+        self.online = protocol is not None and self.present
         if protocol:
             self._protocol = protocol
+        if logger.isEnabledFor(logging.DEBUG):
+            logger.debug("pinged %s: online %s protocol %s present %s", self.number, self.online, protocol, self.present)
         return self.online
 
     def notify_devices(self):  # no need to notify, as there are none

lib/logitech_receiver/notifications.py

@@ -238,6 +238,7 @@ def _process_hidpp10_notification(device: Device, notification: HIDPPNotificatio
 
 
 def _process_feature_notification(device: Device, notification: HIDPPNotification):
+    old_present, device.present = device.present, True  # the device is generating a feature notification so it must be present
     try:
         feature = device.features.get_feature(notification.sub_id)
     except IndexError:
@@ -277,10 +278,11 @@ def _process_feature_notification(device: Device, notification: HIDPPNotificatio
     elif feature == SupportedFeature.ADC_MEASUREMENT:
         if notification.address == 0x00:
             result = hidpp20.decipher_adc_measurement(notification.data)
-            if result:  # this may be the only message signalling that the device has become active
+            if result:  # if good data and  the device was not present then a push is needed
                 device.set_battery_info(result[1])
-                device.changed(active=True, alert=Alert.ALL, reason=_("ADC measurement notification"))
+                device.changed(active=True, alert=Alert.ALL, reason=_("ADC measurement notification"), push=not old_present)
             else:  # this feature is also used to signal device becoming inactive
+                device.present = False  # exception to device presence
                 device.changed(active=False)
         else:
             logger.warning("%s: unknown ADC MEASUREMENT %s", device, notification)

lib/logitech_receiver/settings_templates.py

@@ -1936,8 +1936,9 @@ def check_feature_settings(device, already_known) -> bool:
                         isinstance(err, exceptions.FeatureCallError)
                         and err.error == hidpp20_constants.ErrorCode.LOGITECH_ERROR
                     ):
-                        logger.warning(f"HID++ internal error when checking feature {sclass.name}: make device offline")
+                        logger.warning(f"HID++ internal error checking feature {sclass.name}: make device not present")
                         device.online = False
+                        device.present = False
                         return False
                     else:
                         logger.warning(f"ignore feature {sclass.name} because of error {err}")

tests/logitech_receiver/fake_hidpp.py

@@ -389,6 +389,7 @@ class Device:
     sliding = profiles = _backlight = _keys = _remap_keys = _led_effects = _gestures = None
     _gestures_lock = threading.Lock()
     number = "d1"
+    present = True
 
     read_register = device.Device.read_register
     write_register = device.Device.write_register