Generate device name

esp32_device/main/storage.c

@@ -0,0 +1,55 @@
+#include "constants.h"
+#include "storage.h"
+#include "nvs_flash.h"
+#include "nvs.h"
+#include <string.h>
+
+#define STORAGE_NAMESPACE "storage"
+
+#define DEV_NAME_KEY "dev_name"
+
+bool storage_init()
+{
+    esp_err_t err = nvs_flash_init();
+    if (err == ESP_ERR_NVS_NO_FREE_PAGES || err == ESP_ERR_NVS_NEW_VERSION_FOUND)
+    {
+        printf("Need to reset storage\n");
+
+        // NVS partition was truncated and needs to be erased
+        // Retry nvs_flash_init
+        ESP_ERROR_CHECK(nvs_flash_erase());
+        err = nvs_flash_init();
+    }
+
+    return err == ESP_OK;
+}
+
+void storage_set_dev_name(const char *name)
+{
+    nvs_handle_t my_handle;
+
+    ESP_ERROR_CHECK(nvs_open(STORAGE_NAMESPACE, NVS_READWRITE, &my_handle));
+
+    ESP_ERROR_CHECK(nvs_set_blob(my_handle, DEV_NAME_KEY, name, strlen(name)));
+
+    nvs_close(my_handle);
+}
+
+size_t storage_get_dev_name(char *dest)
+{
+    nvs_handle_t my_handle;
+
+    ESP_ERROR_CHECK(nvs_open(STORAGE_NAMESPACE, NVS_READWRITE, &my_handle));
+
+    size_t len = (dest == NULL ? 0 : DEV_NAME_LEN);
+    esp_err_t res = nvs_get_blob(my_handle, DEV_NAME_KEY, dest, &len);
+
+    nvs_close(my_handle);
+
+    if (res == ESP_ERR_NVS_NOT_FOUND || len == 0)
+        return 0;
+
+    ESP_ERROR_CHECK(res);
+
+    return len;
+}