diff -r 1599e696d947 -r 12506716211c main/nvsio.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main/nvsio.c	Thu Apr 06 20:49:52 2023 +0200
@@ -0,0 +1,139 @@
+/*****************************************************************************
+ * Copyright (C) 2023
+ *
+ * Michiel Broek <mbroek at mbse dot eu>
+ *
+ * This file is part of the ESP32 iotbalkon application.
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * mbsePi-apps is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with ThermFerm; see the file COPYING.  If not, write to the Free
+ * Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *****************************************************************************/
+
+#include "config.h"
+
+#define	NVSIO_Namespace			"balkon"
+
+static const char *TAG = "nvsio";
+
+
+void nvsio_init(void)
+{
+    esp_err_t		err = ESP_OK;
+    nvs_handle_t	my_handle;
+
+    err = nvs_open(NVSIO_Namespace, NVS_READWRITE, &my_handle);
+    if (err != ESP_OK) {
+        ESP_LOGE(TAG, "Error (%s) opening NVS handle '%s'", esp_err_to_name(err), NVSIO_Namespace);
+    } else {
+        nvs_commit(my_handle);
+        nvs_close(my_handle);
+    }
+}
+
+
+uint8_t nvsio_read_u8(char *key)
+{
+    nvs_handle_t	my_handle;
+    esp_err_t		err;
+    uint8_t		val = 0;
+
+    if (nvs_open(NVSIO_Namespace, NVS_READWRITE, &my_handle) == ESP_OK) {
+	err = nvs_get_u8(my_handle, key, &val);
+	if (err == ESP_ERR_NVS_NOT_FOUND) {
+	    err = nvs_set_u8(my_handle, key, 0);
+	    val = 0;
+	    nvs_commit(my_handle);
+	    ESP_LOGI(TAG, "nvsio_read_u8(%s) created", key);
+	}
+	if (err != ESP_OK) {
+            ESP_LOGE(TAG, "nvsio_read_u8(%s) Error (%s) opening NVS namespace '%s'", key, esp_err_to_name(err), NVSIO_Namespace);
+        }
+	nvs_close(my_handle);
+    }
+
+    return val;
+}
+
+
+void nvsio_write_u8(char *key, uint8_t val)
+{
+    nvs_handle_t	my_handle;
+    esp_err_t		err;
+    uint8_t		tmp;
+
+    if (nvs_open(NVSIO_Namespace, NVS_READWRITE, &my_handle) == ESP_OK) {
+	err = nvs_get_u8(my_handle, key, &tmp);
+	if (err == ESP_ERR_NVS_NOT_FOUND) {
+	    nvs_set_u8(my_handle, key, val);
+	    nvs_commit(my_handle);
+	    ESP_LOGI(TAG, "nvsio_write_u8(%s) created val %02x", key, val);
+	} else if (err == ESP_OK && tmp != val) {
+	    nvs_set_u8(my_handle, key, val);
+	    nvs_commit(my_handle);
+	    ESP_LOGI(TAG, "nvsio_write_u8(%s) updated val %02x", key, val);
+	} else {
+	    ESP_LOGI(TAG, "nvsio_write_u8(%s) already val %02x", key, val);
+	}
+	nvs_close(my_handle);
+    }
+}
+
+
+uint32_t nvsio_read_u32(char *key)
+{
+    nvs_handle_t        my_handle;
+    esp_err_t           err;
+    uint32_t		val = 0;
+
+    if (nvs_open(NVSIO_Namespace, NVS_READWRITE, &my_handle) == ESP_OK) {
+        err = nvs_get_u32(my_handle, key, &val);
+        if (err == ESP_ERR_NVS_NOT_FOUND) {
+            err = nvs_set_u32(my_handle, key, 0);
+            val = 0;
+            nvs_commit(my_handle);
+            ESP_LOGI(TAG, "nvsio_read_u32(%s) created", key);
+        }
+        if (err != ESP_OK) {
+            ESP_LOGE(TAG, "nvsio_read_u32(%s) Error (%s) opening NVS namespace '%s'", key, esp_err_to_name(err), NVSIO_Namespace);
+        }
+        nvs_close(my_handle);
+    }
+
+    return val;
+}
+
+
+void nvsio_write_u32(char *key, uint32_t val)
+{
+    nvs_handle_t        my_handle;
+    esp_err_t           err;
+    uint32_t		tmp;
+
+    if (nvs_open(NVSIO_Namespace, NVS_READWRITE, &my_handle) == ESP_OK) {
+        err = nvs_get_u32(my_handle, key, &tmp);
+        if (err == ESP_ERR_NVS_NOT_FOUND) {
+            nvs_set_u32(my_handle, key, val);
+            nvs_commit(my_handle);
+            ESP_LOGI(TAG, "nvsio_write_u32(%s) created val %08lx", key, val);
+        } else if (err == ESP_OK && tmp != val) {
+            nvs_set_u32(my_handle, key, val);
+            nvs_commit(my_handle);
+            ESP_LOGI(TAG, "nvsio_write_u32(%s) updated val %08lx", key, val);
+        } else {
+            ESP_LOGI(TAG, "nvsio_write_u32(%s) already val %08lx", key, val);
+        }
+        nvs_close(my_handle);
+    }
+}
+