diff --git a/NTPClient.cpp b/NTPClient.cpp
old mode 100644
new mode 100755
index f25441a..84429e3
--- a/NTPClient.cpp
+++ b/NTPClient.cpp
@@ -44,6 +44,15 @@ NTPClient::NTPClient(UDP& udp, const char* poolServerName)
   this->_poolServerName = poolServerName;
 }
 
+NTPClient::NTPClient(UDP& udp, IPAddress poolServerIP) 
+  :_updateStartHandler(NULL),
+   _updateEndHandler(NULL)
+{
+  this->_udp            = &udp;
+  this->_poolServerIP   = poolServerIP;
+  this->_poolServerName = NULL;
+}
+
 NTPClient::NTPClient(UDP& udp, const char* poolServerName, long timeOffset) 
   :_updateStartHandler(NULL),
    _updateEndHandler(NULL)
@@ -53,6 +62,16 @@ NTPClient::NTPClient(UDP& udp, const char* poolServerName, long timeOffset)
   this->_poolServerName = poolServerName;
 }
 
+NTPClient::NTPClient(UDP& udp, IPAddress poolServerIP, long timeOffset)
+  :_updateStartHandler(NULL),
+   _updateEndHandler(NULL)
+{
+  this->_udp            = &udp;
+  this->_timeOffset     = timeOffset;
+  this->_poolServerIP   = poolServerIP;
+  this->_poolServerName = NULL;
+}
+
 NTPClient::NTPClient(UDP& udp, const char* poolServerName, long timeOffset, unsigned long updateInterval) 
   :_updateStartHandler(NULL),
    _updateEndHandler(NULL)
@@ -63,11 +82,22 @@ NTPClient::NTPClient(UDP& udp, const char* poolServerName, long timeOffset, unsi
   this->_updateInterval = updateInterval;
 }
 
+NTPClient::NTPClient(UDP& udp, IPAddress poolServerIP, long timeOffset, unsigned long updateInterval) 
+  :_updateStartHandler(NULL),
+   _updateEndHandler(NULL)
+{
+  this->_udp            = &udp;
+  this->_timeOffset     = timeOffset;
+  this->_poolServerIP   = poolServerIP;
+  this->_poolServerName = NULL;
+  this->_updateInterval = updateInterval;
+}
+
 void NTPClient::begin() {
   this->begin(NTP_DEFAULT_LOCAL_PORT);
 }
 
-void NTPClient::begin(int port) {
+void NTPClient::begin(unsigned int port) {
   this->_port = port;
 
   this->_udp->begin(this->_port);
@@ -84,6 +114,10 @@ bool NTPClient::forceUpdate() {
     this->_updateStartHandler();
   }
   
+  // flush any existing packets
+  while(this->_udp->parsePacket() != 0)
+    this->_udp->flush();
+
   this->sendNTPPacket();
 
   // Wait till data is there or timeout...
@@ -112,16 +146,16 @@ bool NTPClient::forceUpdate() {
     this->_updateEndHandler();
   }
 
-  return true;
+  return true;  // return true after successful update
 }
 
 bool NTPClient::update() {
   if ((millis() - this->_lastUpdate >= this->_updateInterval)     // Update after _updateInterval
     || this->_lastUpdate == 0) {                                // Update if there was no update yet.
-    if (!this->_udpSetup) this->begin();                         // setup the UDP client if needed
+    if (!this->_udpSetup || this->_port != NTP_DEFAULT_LOCAL_PORT) this->begin(this->_port); // setup the UDP client if needed
     return this->forceUpdate();
   }
-  return true;
+  return false;   // return false if update does not occur
 }
 
 unsigned long NTPClient::getEpochTime() const {
@@ -180,6 +214,7 @@ void NTPClient::sendNTPPacket() {
   memset(this->_packetBuffer, 0, NTP_PACKET_SIZE);
   // Initialize values needed to form NTP request
   // (see URL above for details on the packets)
+
   this->_packetBuffer[0] = 0b11100011;   // LI, Version, Mode
   this->_packetBuffer[1] = 0;     // Stratum, or type of clock
   this->_packetBuffer[2] = 6;     // Polling Interval
@@ -192,7 +227,16 @@ void NTPClient::sendNTPPacket() {
 
   // all NTP fields have been given values, now
   // you can send a packet requesting a timestamp:
-  this->_udp->beginPacket(this->_poolServerName, 123); //NTP requests are to port 123
+  if  (this->_poolServerName) {
+    this->_udp->beginPacket(this->_poolServerName, 123);
+  } else {
+    this->_udp->beginPacket(this->_poolServerIP, 123);
+  }
   this->_udp->write(this->_packetBuffer, NTP_PACKET_SIZE);
   this->_udp->endPacket();
 }
+
+void NTPClient::setRandomPort(unsigned int minValue, unsigned int maxValue) {
+  randomSeed(analogRead(0));
+  this->_port = random(minValue, maxValue);
+}
\ No newline at end of file
diff --git a/NTPClient.h b/NTPClient.h
old mode 100644
new mode 100755
index 67eaf4b..2858075
--- a/NTPClient.h
+++ b/NTPClient.h
@@ -20,7 +20,8 @@ class NTPClient {
     bool          _udpSetup       = false;
 
     const char*   _poolServerName = "pool.ntp.org"; // Default time server
-    int           _port           = NTP_DEFAULT_LOCAL_PORT;
+    IPAddress     _poolServerIP;
+    unsigned int  _port           = NTP_DEFAULT_LOCAL_PORT;
     long          _timeOffset     = 0;
 
     unsigned long _updateInterval = 60000;  // In ms
@@ -41,6 +42,9 @@ class NTPClient {
     NTPClient(UDP& udp, const char* poolServerName);
     NTPClient(UDP& udp, const char* poolServerName, long timeOffset);
     NTPClient(UDP& udp, const char* poolServerName, long timeOffset, unsigned long updateInterval);
+    NTPClient(UDP& udp, IPAddress poolServerIP);
+    NTPClient(UDP& udp, IPAddress poolServerIP, long timeOffset);
+    NTPClient(UDP& udp, IPAddress poolServerIP, long timeOffset, unsigned long updateInterval);
 
     /**
      * Set time server name
@@ -49,6 +53,11 @@ class NTPClient {
      */
     void setPoolServerName(const char* poolServerName);
 
+     /**
+     * Set random local port
+     */
+    void setRandomPort(unsigned int minValue = 49152, unsigned int maxValue = 65535);
+
     /**
      * Starts the underlying UDP client with the default local port
      */
@@ -57,7 +66,7 @@ class NTPClient {
     /**
      * Starts the underlying UDP client with the specified local port
      */
-    void begin(int port);
+    void begin(unsigned int port);
 
     /**
      * This should be called in the main loop of your application. By default an update from the NTP Server is only
diff --git a/README.md b/README.md
index 6c8c07a..46f9eb5 100644
--- a/README.md
+++ b/README.md
@@ -45,3 +45,6 @@ void loop() {
   delay(1000);
 }
 ```
+
+## Function documentation
+`getEpochTime` returns the unix epoch, which are the seconds elapsed since 00:00:00 UTC on 1 January 1970 (leap seconds are ignored, every day is treated as having 86400 seconds). **Attention**: If you have set a time offset this time offset will be added to your epoch timestamp.
diff --git a/library.properties b/library.properties
index d4908ca..309b75d 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=NTPClient
-version=3.1.0
+version=3.2.0
 author=Fabrice Weinberg
 maintainer=Fabrice Weinberg <fabrice@weinberg.me>
 sentence=An NTPClient to connect to a time server