Native Ethernet on Teensy 4.1

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DaniO

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Hi,

I'm trying to get started with the native Ethernet on Teensy 4.1 but I can get the UDPSendReceiveString example to work. It works fine on an Arduino Uno with Ethernet shield so on the PC side the script is working fine.
I don't know much about network communication, are there any steps that I'm missing or settings that I can try?

Thanks.

Wiring.jpg

Code:
#include <NativeEthernet.h>
#include <NativeEthernetUdp.h>

// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = {
  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xAD
};
IPAddress ip(192, 168, 0, 20);

unsigned int localPort = 8888;      // local port to listen on

// buffers for receiving and sending data
char packetBuffer[UDP_TX_PACKET_MAX_SIZE];  // buffer to hold incoming packet,
char ReplyBuffer[] = "acknowledged";        // a string to send back

// An EthernetUDP instance to let us send and receive packets over UDP
EthernetUDP Udp;

void setup() {
  // You can use Ethernet.init(pin) to configure the CS pin
  //Ethernet.init(10);  // Most Arduino shields
  //Ethernet.init(5);   // MKR ETH shield
  //Ethernet.init(0);   // Teensy 2.0
  //Ethernet.init(20);  // Teensy++ 2.0
  //Ethernet.init(15);  // ESP8266 with Adafruit Featherwing Ethernet
  //Ethernet.init(33);  // ESP32 with Adafruit Featherwing Ethernet

  // start the Ethernet
  Ethernet.begin(mac, ip);

  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  // Check for Ethernet hardware present
  if (Ethernet.hardwareStatus() == EthernetNoHardware) {
    Serial.println("Ethernet shield was not found.  Sorry, can't run without hardware. :(");
    while (true) {
      delay(1); // do nothing, no point running without Ethernet hardware
    }
  }
  if (Ethernet.linkStatus() == LinkOFF) {
    Serial.println("Ethernet cable is not connected.");
  }

  // start UDP
  Udp.begin(localPort);
}

void loop() {
  // if there's data available, read a packet
  int packetSize = Udp.parsePacket();
  if (packetSize) {
    Serial.print("Received packet of size ");
    Serial.println(packetSize);
    Serial.print("From ");
    IPAddress remote = Udp.remoteIP();
    for (int i=0; i < 4; i++) {
      Serial.print(remote[i], DEC);
      if (i < 3) {
        Serial.print(".");
      }
    }
    Serial.print(", port ");
    Serial.println(Udp.remotePort());

    // read the packet into packetBufffer
    Udp.read(packetBuffer, UDP_TX_PACKET_MAX_SIZE);
    Serial.println("Contents:");
    Serial.println(packetBuffer);

    // send a reply to the IP address and port that sent us the packet we received
    Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());
    Udp.write(ReplyBuffer);
    Udp.endPacket();
  }

  delay(10);
}
 
Your sketch works for me. What do you observe? Packet is never received ? or reply is not seen by sender? can you ping the Teensy 4.1?
Can you run wireshark/tcpdump and and observe the packets ?

do any of the NativeEthernet examples work for you?

Probably should zero packetBuffer before Udp.read() -- cosmetic
 
What version of Arduino and Teensyduino are you using?
Latest Teensduino in beta includes corrections for NativeEthernet.
 
Thanks, I installed the newest version of Teensyduino and now it works!

I was indeed not receiving any packets. Thanks for referring me to Wireshark, what an awesome tool! I expect it will make my life a lot easier going forward.

Indeed it would be cleaner to clear packetBuffer before writing to it, shall do!

Many thanks!!
 
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