From 55a91f0ae46baffe2dcec6390ca874db44d30718 Mon Sep 17 00:00:00 2001
From: "Peter F. Patel-Schneider" <pfpschneider@gmail.com>
Date: Tue, 18 Jan 2022 11:20:43 -0500
Subject: [PATCH] device: add id property (unitId or serial) and don't use ?
 for unknown serial

---
 lib/logitech_receiver/device.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/lib/logitech_receiver/device.py b/lib/logitech_receiver/device.py
index 6e12ac74..a2d4bf1d 100644
--- a/lib/logitech_receiver/device.py
+++ b/lib/logitech_receiver/device.py
@@ -264,7 +264,14 @@ class Device:
     def serial(self):
         if not self._serial:
             self.update_extended_pairing_information()
-        return self._serial or '?'
+        return self._serial or ''
+
+    @property
+    def id(self):
+        if not self.serial:
+            if self.persister and self.persister.get('_serial', None):
+                self._serial = self.persister.get('_serial', None)
+        return self.unitId or self.serial
 
     @property
     def power_switch_location(self):