feat(bluetooth-low-energy): added max distance option

Mirrors the feature of room-assistant v1. If peripherals are found with
an estimated distance higher than configured as max, the sighting is
dropped.

src/integrations/bluetooth-low-energy/bluetooth-low-energy.config.ts

@@ -8,6 +8,7 @@ export class BluetoothLowEnergyConfig {
   tagOverrides: { [key: string]: TagOverride } = {};
 
   timeout = 5;
+  maxDistance?: number;
 }
 
 class TagOverride {

src/integrations/bluetooth-low-energy/bluetooth-low-energy.service.spec.ts

@@ -407,6 +407,42 @@ describe('BluetoothLowEnergyService', () => {
     );
   });
 
+  it('should report peripherals that are closer than the max distance', () => {
+    const handleDistanceSpy = jest
+      .spyOn(service, 'handleNewDistance')
+      .mockImplementation(() => undefined);
+    jest.spyOn(service, 'isOnWhitelist').mockReturnValue(true);
+    mockConfig.maxDistance = 5;
+
+    service.handleDiscovery({
+      id: '12:ab:cd:12:cd',
+      rssi: -45,
+      advertisement: {
+        localName: 'Test BLE Device'
+      }
+    } as Peripheral);
+    expect(handleDistanceSpy).toHaveBeenCalled();
+    expect(clusterService.publish).toHaveBeenCalled();
+  });
+
+  it('should ignore peripherals that are further away than max distance', () => {
+    const handleDistanceSpy = jest
+      .spyOn(service, 'handleNewDistance')
+      .mockImplementation(() => undefined);
+    jest.spyOn(service, 'isOnWhitelist').mockReturnValue(true);
+    mockConfig.maxDistance = 5;
+
+    service.handleDiscovery({
+      id: '12:ab:cd:12:cd',
+      rssi: -89,
+      advertisement: {
+        localName: 'Test BLE Device'
+      }
+    } as Peripheral);
+    expect(handleDistanceSpy).not.toHaveBeenCalled();
+    expect(clusterService.publish).not.toHaveBeenCalled();
+  });
+
   it('should reuse existing Kalman filters for the same id', () => {
     const sensor = new Sensor('testid', 'Test');
     entitiesService.has.mockReturnValue(true);

src/integrations/bluetooth-low-energy/bluetooth-low-energy.service.ts

@@ -87,15 +87,20 @@ export class BluetoothLowEnergyService extends KalmanFilterable(Object, 0.8, 15)
       tag = this.applyOverrides(tag);
       tag.rssi = this.filterRssi(tag.id, tag.rssi);
 
-      const globalSettings = this.configService.get('global');
-      const event = new NewDistanceEvent(
-        globalSettings.instanceName,
-        tag.id,
-        tag.name,
-        tag.distance
-      );
-      this.handleNewDistance(event);
-      this.clusterService.publish(NEW_DISTANCE_CHANNEL, event);
+      if (
+        this.config.maxDistance == undefined ||
+        tag.distance <= this.config.maxDistance
+      ) {
+        const globalSettings = this.configService.get('global');
+        const event = new NewDistanceEvent(
+          globalSettings.instanceName,
+          tag.id,
+          tag.name,
+          tag.distance
+        );
+        this.handleNewDistance(event);
+        this.clusterService.publish(NEW_DISTANCE_CHANNEL, event);
+      }
     }
   }