From c600d28b6a1b064cf6bfc80080572bb597661aff Mon Sep 17 00:00:00 2001
From: Jason Hu <awarecan@users.noreply.github.com>
Date: Sat, 29 Sep 2018 11:53:02 -0700
Subject: [PATCH] Override unique_id of NestActivityZoneSensor (#16961)

---
 homeassistant/components/binary_sensor/nest.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/homeassistant/components/binary_sensor/nest.py b/homeassistant/components/binary_sensor/nest.py
index c60463a8663..7f7278d9789 100644
--- a/homeassistant/components/binary_sensor/nest.py
+++ b/homeassistant/components/binary_sensor/nest.py
@@ -147,6 +147,11 @@ class NestActivityZoneSensor(NestBinarySensor):
         self.zone = zone
         self._name = "{} {} activity".format(self._name, self.zone.name)
 
+    @property
+    def unique_id(self):
+        """Return unique id based on camera serial and zone id."""
+        return "{}-{}".format(self.device.serial, self.zone.zone_id)
+
     @property
     def device_class(self):
         """Return the device class of the binary sensor."""