Squash of branch setup

main/io/io.h

@@ -0,0 +1,26 @@
+#pragma once
+#include "freertos/FreeRTOS.h"
+#include "freertos/event_groups.h"
+#include <memory>
+
+typedef bool(*FilterFunc)(const std::string& key);
+typedef void (*KeyValueProcessor)(void* arg, const std::string& key, const std::string& value);
+
+class KVStorageHandler {
+public:
+  virtual ~KVStorageHandler() = default;
+
+  virtual void init(const EventGroupHandle_t& system_event_group) = 0;
+
+  // Store a key-value pair
+  virtual void put(const std::string& key, const std::string& value) = 0;
+
+  // Retrieve a value by key, returns empty string if key not found
+  virtual std::string get(const std::string& key) const = 0;
+  virtual esp_err_t process_all(KeyValueProcessor processor, void* arg) const = 0;
+  virtual esp_err_t process_filtered(const std::string& key_prefix, KeyValueProcessor processor, void* arg) const = 0;
+  virtual esp_err_t process_filtered(FilterFunc filter_func, KeyValueProcessor processor, void* arg) const = 0;
+
+  // Delete a key-value pair
+  virtual void remove(const std::string& key) = 0;
+};