Added support for retrieving energy price from ENTSO-E API

src/entsoe/EntsoeApi.h

@@ -0,0 +1,50 @@
+#ifndef _ENTSOEAPI_H
+#define _ENTSOEAPI_H
+
+#include "time.h"
+#include "Timezone.h"
+#include "RemoteDebug.h"
+#include "EntsoeA44Parser.h"
+
+#define ENTSOE_NO_VALUE -127
+#define ENTSOE_DEFAULT_MULTIPLIER 1.00
+
+class EntsoeApi {
+public:
+    EntsoeApi(RemoteDebug* Debug);
+    bool loop();
+
+    double getValueForHour(int hour);
+    char* getCurrency();
+
+    void setToken(const char* token);
+    void setArea(const char* area);
+    void setCurrency(const char* currency);
+    void setMultiplier(double multiplier);
+
+private:
+    RemoteDebug* debugger;
+    char token[37]; // UUID + null terminator
+
+    uint64_t midnightMillis = 0;
+    uint64_t lastTomorrowFetch = 0;
+    uint64_t lastCurrencyFetch = 0;
+    EntsoeA44Parser* today = NULL;
+    EntsoeA44Parser* tomorrow = NULL;
+
+    Timezone* tz = NULL;
+
+    char area[32];
+    char currency[4];
+    double multiplier = ENTSOE_DEFAULT_MULTIPLIER;
+    double currencyMultiplier = ENTSOE_DEFAULT_MULTIPLIER;
+
+    bool retrieve(const char* url, Stream* doc);
+    double getCurrencyMultiplier(const char* from, const char* to);
+
+	void printD(String fmt, ...);
+	void printI(String fmt, ...);
+	void printW(String fmt, ...);
+	void printE(String fmt, ...);
+};
+#endif