diff --git a/main/nvs-config.c b/main/nvs-config.c
new file mode 100644
index 0000000..41220c0
--- /dev/null
+++ b/main/nvs-config.c
@@ -0,0 +1,125 @@
+#include <m-string.h>
+#include "nvs.h"
+#include "nvs-config.h"
+
+#define WIFI_MODE_KEY "wifi_mode"
+#define WIFI_AP_SSID_KEY "wifi_ap_ssid"
+#define WIFI_AP_PASS_KEY "wifi_ap_pass"
+#define WIFI_STA_SSID_KEY "wifi_sta_ssid"
+#define WIFI_STA_PASS_KEY "wifi_sta_pass"
+
+#define ESP_WIFI_DEFAULT_SSID "blackmagic"
+#define ESP_WIFI_DEFAULT_PASS "iamwitcher"
+
+esp_err_t nvs_config_set_wifi_mode(WiFiMode value) {
+    mstring_t* mode = mstring_alloc();
+
+    switch(value) {
+    case WiFiModeAP:
+        mstring_set(mode, CFG_WIFI_MODE_AP);
+        break;
+    case WiFiModeSTA:
+        mstring_set(mode, CFG_WIFI_MODE_STA);
+        break;
+    }
+
+    esp_err_t err = nvs_save_string(WIFI_MODE_KEY, mode);
+
+    mstring_free(mode);
+    return err;
+}
+
+esp_err_t nvs_config_set_ap_ssid(const mstring_t* ssid) {
+    esp_err_t err = ESP_FAIL;
+
+    if(mstring_size(ssid) > 0 && mstring_size(ssid) <= 32) {
+        err = nvs_save_string(WIFI_AP_SSID_KEY, ssid);
+    }
+
+    return err;
+}
+
+esp_err_t nvs_config_set_ap_pass(const mstring_t* pass) {
+    esp_err_t err = ESP_FAIL;
+
+    if(mstring_size(pass) == 0 || (mstring_size(pass) >= 8 && mstring_size(pass) <= 64)) {
+        err = nvs_save_string(WIFI_AP_PASS_KEY, pass);
+    }
+
+    return err;
+}
+
+esp_err_t nvs_config_set_sta_ssid(const mstring_t* ssid) {
+    esp_err_t err = ESP_FAIL;
+
+    if(mstring_size(ssid) > 0 && mstring_size(ssid) <= 32) {
+        err = nvs_save_string(WIFI_STA_SSID_KEY, ssid);
+    }
+
+    return err;
+}
+
+esp_err_t nvs_config_set_sta_pass(const mstring_t* pass) {
+    esp_err_t err = ESP_FAIL;
+
+    if(mstring_size(pass) == 0 || (mstring_size(pass) >= 8 && mstring_size(pass) <= 64)) {
+        err = nvs_save_string(WIFI_STA_PASS_KEY, pass);
+    }
+
+    return err;
+}
+
+esp_err_t nvs_config_get_wifi_mode(WiFiMode* value) {
+    mstring_t* mode = mstring_alloc();
+    esp_err_t err = nvs_load_string(WIFI_MODE_KEY, mode);
+
+    if(err == ESP_OK && mstring_cmp_cstr(mode, CFG_WIFI_MODE_STA) == 0) {
+        *value = WiFiModeSTA;
+    } else {
+        // AP mode by default
+        *value = WiFiModeAP;
+    }
+
+    mstring_free(mode);
+    return err;
+}
+
+esp_err_t nvs_config_get_ap_ssid(mstring_t* ssid) {
+    esp_err_t err = nvs_load_string(WIFI_AP_SSID_KEY, ssid);
+
+    if(err != ESP_OK) {
+        mstring_set(ssid, ESP_WIFI_DEFAULT_SSID);
+    }
+
+    return err;
+}
+
+esp_err_t nvs_config_get_ap_pass(mstring_t* pass) {
+    esp_err_t err = nvs_load_string(WIFI_AP_PASS_KEY, pass);
+
+    if(err != ESP_OK) {
+        mstring_set(pass, ESP_WIFI_DEFAULT_PASS);
+    }
+
+    return err;
+}
+
+esp_err_t nvs_config_get_sta_ssid(mstring_t* ssid) {
+    esp_err_t err = nvs_load_string(WIFI_STA_SSID_KEY, ssid);
+
+    if(err != ESP_OK) {
+        mstring_set(ssid, ESP_WIFI_DEFAULT_SSID);
+    }
+
+    return err;
+}
+
+esp_err_t nvs_config_get_sta_pass(mstring_t* pass) {
+    esp_err_t err = nvs_load_string(WIFI_STA_PASS_KEY, pass);
+
+    if(err != ESP_OK) {
+        mstring_set(pass, ESP_WIFI_DEFAULT_PASS);
+    }
+
+    return err;
+}
\ No newline at end of file
diff --git a/main/nvs-config.h b/main/nvs-config.h
new file mode 100644
index 0000000..b211a38
--- /dev/null
+++ b/main/nvs-config.h
@@ -0,0 +1,32 @@
+/**
+ * @file nvs-config.h
+ * @author Sergey Gavrilov (who.just.the.doctor@gmail.com)
+ * @version 1.0
+ * @date 2021-12-03
+ * 
+ * Configuration helper
+ */
+#pragma once
+
+#include <m-string.h>
+#include <esp_err.h>
+
+#define CFG_WIFI_MODE_AP "AP"
+#define CFG_WIFI_MODE_STA "STA"
+
+typedef enum {
+    WiFiModeAP, // host of a WiFi network
+    WiFiModeSTA, // connected to existing WiFi AP
+} WiFiMode;
+
+esp_err_t nvs_config_set_wifi_mode(WiFiMode value);
+esp_err_t nvs_config_set_ap_ssid(const mstring_t* ssid);
+esp_err_t nvs_config_set_ap_pass(const mstring_t* pass);
+esp_err_t nvs_config_set_sta_ssid(const mstring_t* ssid);
+esp_err_t nvs_config_set_sta_pass(const mstring_t* pass);
+
+esp_err_t nvs_config_get_wifi_mode(WiFiMode* value);
+esp_err_t nvs_config_get_ap_ssid(mstring_t* ssid);
+esp_err_t nvs_config_get_ap_pass(mstring_t* pass);
+esp_err_t nvs_config_get_sta_ssid(mstring_t* ssid);
+esp_err_t nvs_config_get_sta_pass(mstring_t* pass);
\ No newline at end of file