Issue witnessmenow#9: first take at answreCallbackQuery()

Author: gerasdf

src/UniversalTelegramBot.cpp

@@ -837,3 +837,24 @@ bool UniversalTelegramBot::getFile(String& file_path, long& file_size, const Str
   }
   return false;
 }
+
+bool UniversalTelegramBot::answerCallbackQuery(const String &query_id, const String &text, bool show_alert, const String &url, int cache_time) {
+  String command = BOT_CMD("answerCallbackQuery?query_id=");
+  command += query_id;
+  command += F("&show_alert=");
+  command += show_alert;
+  command += F("&cache_time=");
+  command += cache_time;
+  if (!text.isEmpty()) {
+    command += F("&text=");
+    command += text;
+  }
+  if (!url.isEmpty()) {
+    command += F("&url=");
+    command += url;
+  }
+  String response = sendGetToTelegram(command); // receive reply from telegram.org
+  bool answer = checkForOkResponse(response);
+  closeClient();
+  return answer;
+}

src/UniversalTelegramBot.h

@@ -101,6 +101,12 @@ class UniversalTelegramBot {
                    bool disable_notification = false,
                    int reply_to_message_id = 0, const String& keyboard = "");
 
+  bool answerCallbackQuery(const String &query_id,
+                           const String &text = "",
+                           bool show_alert = false,
+                           const String &url = "", 
+                           int cache_time = 0);
+
   bool setMyCommands(const String& commandArray);
 
   String buildCommand(const String& cmd);