added lib to cache data if not sent successfully

client/client/lib/caching/src/ram_caching.cpp

+#include <Arduino.h>
+#include "espnow.hpp"
+
+RTC_DATA_ATTR int cachedAmount = -1;
+RTC_DATA_ATTR data_struct backup[10];
+
+data_struct ram_cache_pop(){
+    return backup[cachedAmount--];
+}
+
+bool ram_cache_push(data_struct data){
+    backup[++cachedAmount] = data;
+}
+
+bool ram_cache_is_empty(){
+    return cachedAmount == -1;
+}
+
+bool ram_cache_is_full(){
+    return cachedAmount == 9;
+}
\ No newline at end of file

client/client/lib/caching/src/ram_caching.hpp

+#ifndef _RAM_CACHE
+#define _RAM_CACHE
+#include "espnow.hpp"
+
+bool ram_cache_push(data_struct data);
+bool ram_cache_is_empty();
+bool ram_cache_is_full();
+data_struct ram_cache_pop();
+
+#endif
\ No newline at end of file

client/client/lib/espnow/src/espnow.hpp

@@ -22,6 +22,7 @@ typedef struct config{
 class Message{
     public:
         Message();
+        Message(data_struct old_data);
         void add_data(float value, int identifier);
         esp_err_t send();