From d057e544e01c6cc7327b1c3887e19850f90ee55b Mon Sep 17 00:00:00 2001
From: lbernstone <lbernstone@gmail.com>
Date: Tue, 14 Aug 2018 02:52:01 -0700
Subject: [PATCH] Added a freeEntries method to Preferences library (#1722)

---
 libraries/Preferences/src/Preferences.cpp | 10 ++++++++++
 libraries/Preferences/src/Preferences.h   |  1 +
 2 files changed, 11 insertions(+)

diff --git a/libraries/Preferences/src/Preferences.cpp b/libraries/Preferences/src/Preferences.cpp
index b3859a0e..81b9b198 100644
--- a/libraries/Preferences/src/Preferences.cpp
+++ b/libraries/Preferences/src/Preferences.cpp
@@ -468,3 +468,13 @@ size_t Preferences::getBytes(const char* key, void * buf, size_t maxLen){
     }
     return len;
 }
+
+size_t Preferences::freeEntries() {
+    nvs_stats_t nvs_stats;
+    esp_err_t err = nvs_get_stats(NULL, &nvs_stats);
+    if(err){
+        log_e("Failed to get nvs statistics");
+        return 0;
+    }
+    return nvs_stats.free_entries;
+}
diff --git a/libraries/Preferences/src/Preferences.h b/libraries/Preferences/src/Preferences.h
index cf98e8ef..e4872693 100644
--- a/libraries/Preferences/src/Preferences.h
+++ b/libraries/Preferences/src/Preferences.h
@@ -64,6 +64,7 @@ class Preferences {
         size_t getString(const char* key, char* value, size_t maxLen);
         String getString(const char* key, String defaultValue = String());
         size_t getBytes(const char* key, void * buf, size_t maxLen);
+        size_t freeEntries();
 };
 
 #endif