set random NTP port by default

Author: Luigi Gubello

src/utility/time/NTPUtils.cpp

@@ -25,15 +25,23 @@
 #include "NTPUtils.h"
 
 #include <Arduino.h>
+#ifdef BOARD_HAS_ECCX08
+  #include <ArduinoECCX08.h>
+  bool has_crypto = 1;
+#else
+  bool has_crypto = 0;
+#endif
 
 /**************************************************************************************
  * PUBLIC MEMBER FUNCTIONS
  **************************************************************************************/
 
 unsigned long NTPUtils::getTime(UDP & udp)
 {
-  udp.begin(NTP_LOCAL_PORT);
-  
+  NTPUtils randomPort;
+  int _randomPort = randomPort.setRandomPort(MIN_NTP_PORT, MAX_NTP_PORT);
+  udp.begin(_randomPort);
+
   sendNTPpacket(udp);
 
   bool is_timeout = false;
@@ -83,4 +91,13 @@ void NTPUtils::sendNTPpacket(UDP & udp)
   udp.endPacket();
 }
 
+int NTPUtils::setRandomPort(int minValue, int maxValue) {
+  if (has_crypto) {
+    return ECCX08.random(minValue, maxValue);
+  } else {
+    randomSeed(analogRead(0));
+    return random(minValue, maxValue);
+  }
+}
+
 #endif /* #ifndef HAS_LORA */

src/utility/time/NTPUtils.h

@@ -37,22 +37,26 @@
  * CLASS DECLARATION
  **************************************************************************************/
 
+#define NTP_DEFAULT_LOCAL_PORT 8888
+extern const int  MIN_NTP_PORT;
+extern const int  MAX_NTP_PORT;
+
 class NTPUtils
 {
 public:
 
   static unsigned long getTime(UDP & udp);
+  int setRandomPort(int minValue, int maxValue);
 
 private:
 
   static size_t        const NTP_PACKET_SIZE      = 48;
   static int           const NTP_TIME_SERVER_PORT = 123;
-  static int           const NTP_LOCAL_PORT       = 8888;
+  static int           const NTP_LOCAL_PORT       = NTP_DEFAULT_LOCAL_PORT;
   static unsigned long const NTP_TIMEOUT_MS       = 1000;
   static char constexpr *    NTP_TIME_SERVER      = "time.arduino.cc";
 
   static void sendNTPpacket(UDP & udp);
-
 };
 
 #endif /* #ifndef HAS_LORA */