Merge branch 'callback-fix' into 'master'

LowEffortService: Filter for relevant characteristic.

See merge request card10/companion-app-android!21

app/src/main/java/de/ccc/events/badge/card10/filetransfer/LowEffortService.kt

@@ -92,6 +92,10 @@ class LowEffortService(
     }
 
     override fun onCharacteristicChanged(characteristic: BluetoothGattCharacteristic) {
+        if (characteristic.uuid != FILE_RX_UUID) {
+            return
+        }
+
         listener?.onPacketReceived(Packet.fromBytes(characteristic.value))
     }
 }
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