[SOLVED] "Send tweet with timestamp" sketch hangs, shows no activity

Projects Programming
12

You may want to try calling Udp.stop() or Udp.flush() at the end of the NTP function. If it is sending the first correctly but hanging after that, it sounds like a resource issue to me. I've never tried this and maybe someone can verify, can you open EthernetUdp.cpp and add some Serial.println()'s to debug and see why its hanging there?

unsigned long sendNTPpacket(IPAddress& address)
{
  Serial.println("sendNTPpacket() begins!");
  // set all bytes in the buffer to 0
  memset(packetBuffer, 0, NTP_PACKET_SIZE); 
  
  Serial.println("memset set!");
  // Initialize values needed to form NTP request
  // (see URL above for details on the packets)
  
    Serial.println("adding to packetBuffer!");
  
  packetBuffer[0] = 0b11100011;   // LI, Version, Mode
  packetBuffer[1] = 0;     // Stratum, or type of clock
  packetBuffer[2] = 6;     // Polling Interval
  packetBuffer[3] = 0xEC;  // Peer Clock Precision
  // 8 bytes of zero for Root Delay & Root Dispersion
  packetBuffer[12]  = 49; 
  packetBuffer[13]  = 0x4E;
  packetBuffer[14]  = 49;
  packetBuffer[15]  = 52;

    Serial.println("packetBuffer set!");
  // all NTP fields have been given values, now
  // you can send a packet requesting a timestamp: 		   
  Udp.beginPacket(address, 123); //NTP requests are to port 123
  
    Serial.println("beginPacket set!");
  Udp.write(packetBuffer,NTP_PACKET_SIZE);
  
    Serial.println("write set!");
  Serial.print("NTP_PACKET_SIZE: ");
  Serial.println(NTP_PACKET_SIZE);
   
  
  Udp.endPacket();                              // << Code hangs here when I try to send a second tweet
  Serial.println("packet ended!");
  Serial.println("sendNTPpacket() ENDING!");
  Serial.println("");
  Udp.flush();
  Serial.println("Flush out Udp instance";
}