assign new device id on unpair

NukiDeviceId.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <cstdint>
+#include <Preferences.h>
+
+class NukiDeviceId
+{
+public:
+    NukiDeviceId(Preferences* preferences, const std::string& preferencesId);
+
+    uint32_t get();
+
+    void assignId(const uint32_t& id);
+    void assignNewId();
+
+private:
+    uint32_t getRandomId();
+
+    Preferences* _preferences;
+    const std::string _preferencesId;
+    uint32_t _deviceId = 0;
+};