[SYS] Externalize utils functions (#2046)

To declutter main.ino code

Co-authored-by: Florian <1technophile@users.noreply.github.com>

lib/TheengsUtils/TheengsUtils.h

@@ -0,0 +1,49 @@
+/*
+  Theengs - IoT Interoperability
+
+  Copyright: (c)Florian ROBERT
+
+    This file is part of Theengs products.
+
+    Theengs is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    Theengs is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef THEENGS_UTIL_H
+#define THEENGS_UTIL_H
+
+#include <Arduino.h>
+#include <time.h>
+#include <IPAddress.h>
+#include <string>
+
+class TheengsUtils {
+public:
+    static String toString(uint64_t input);
+    static std::string processCert(const char* cert);
+    static std::string generateHash(const std::string& input);
+    static bool cmpToMainTopic(const char* topicOri, const char* toAdd);
+    static unsigned long uptime();
+    static void syncNTP();
+    static int unixtimestamp();
+    static String UTCtimestamp();
+    static void revert_hex_data(const char* in, char* out, int l);
+    static long value_from_hex_data(const char* service_data, int offset, int data_length, bool reverse, bool canBeNegative = true);
+    static double round2(float value);
+    static bool _rawToHex(byte* in, char* out, int rawSize);
+    static bool _hexToRaw(const char* in, byte* out, int rawSize);
+    static char* ip2CharArray(IPAddress ip);
+    static bool to_bool(String const& s);
+};
+
+#endif