diff --git a/NTPClient.cpp b/NTPClient.cpp
old mode 100644
new mode 100755
index 07adce7..7be57b7
--- a/NTPClient.cpp
+++ b/NTPClient.cpp
@@ -35,12 +35,25 @@ NTPClient::NTPClient(UDP& udp, const char* poolServerName) {
   this->_poolServerName = poolServerName;
 }
 
+NTPClient::NTPClient(UDP& udp, IPAddress poolServerIP) {
+  this->_udp            = &udp;
+  this->_poolServerIP   = poolServerIP;
+  this->_poolServerName = NULL;
+}
+
 NTPClient::NTPClient(UDP& udp, const char* poolServerName, long timeOffset) {
   this->_udp            = &udp;
   this->_timeOffset     = timeOffset;
   this->_poolServerName = poolServerName;
 }
 
+NTPClient::NTPClient(UDP& udp, IPAddress poolServerIP, long timeOffset){
+  this->_udp            = &udp;
+  this->_timeOffset     = timeOffset;
+  this->_poolServerIP   = poolServerIP;
+  this->_poolServerName = NULL;
+}
+
 NTPClient::NTPClient(UDP& udp, const char* poolServerName, long timeOffset, unsigned long updateInterval) {
   this->_udp            = &udp;
   this->_timeOffset     = timeOffset;
@@ -48,6 +61,14 @@ NTPClient::NTPClient(UDP& udp, const char* poolServerName, long timeOffset, unsi
   this->_updateInterval = updateInterval;
 }
 
+NTPClient::NTPClient(UDP& udp, IPAddress poolServerIP, long timeOffset, unsigned long updateInterval) {
+  this->_udp            = &udp;
+  this->_timeOffset     = timeOffset;
+  this->_poolServerIP   = poolServerIP;
+  this->_poolServerName = NULL;
+  this->_updateInterval = updateInterval;
+}
+
 void NTPClient::begin() {
   this->begin(NTP_DEFAULT_LOCAL_PORT);
 }
@@ -93,6 +114,10 @@ bool NTPClient::forceUpdate() {
     Serial.println("Update from NTP Server");
   #endif
 
+  // flush any existing packets
+  while(this->_udp->parsePacket() != 0)
+    this->_udp->flush();
+
   this->sendNTPPacket();
 
   // Wait till data is there or timeout...
@@ -223,7 +248,11 @@ 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();
 
diff --git a/NTPClient.h b/NTPClient.h
old mode 100644
new mode 100755
index 94470cc..df8c626
--- a/NTPClient.h
+++ b/NTPClient.h
@@ -19,6 +19,7 @@ class NTPClient {
     bool          _udpSetup       = false;
 
     const char*   _poolServerName = "pool.ntp.org"; // Default time server
+    IPAddress     _poolServerIP;
     int           _port           = NTP_DEFAULT_LOCAL_PORT;
     long          _timeOffset     = 0;
 
@@ -43,6 +44,9 @@ 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
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