Tcp retransmission issue

[MonirA1990]

The issue of tcp retransmission still exist with server when using webclient example, what should i do to solve it? I am using stm32 blue pill with ENC28J60. Thanks

[JAndrassy]

do you use a recent version of UIPEthernet? did you try EthernetENC library? do you have a Wireshark log?

[MonirA1990]

Yes I have recent version. wireshark log:

ServerIP = 192.168.1.8 stmIP = 192.168.1.3

25 11.146170 192.168.1.3 192.168.1.8 TCP 60 1026 → 80 [SYN] Seq=0 Win=512 Len=0 MSS=512 27 12.888975 192.168.1.3 192.168.1.8 TCP 60 [TCP Retransmission] 1026 → 80 [SYN] Seq=0 Win=512 Len=0 MSS=512 86 16.061723 192.168.1.3 192.168.1.8 TCP 60 [TCP Retransmission] 1026 → 80 [SYN] Seq=0 Win=512 Len=0 MSS=512 102 22.310085 192.168.1.3 192.168.1.8 TCP 60 [TCP Retransmission] 1026 → 80 [SYN] Seq=0 Win=512 Len=0 MSS=512 119 34.532223 192.168.1.3 192.168.1.8 TCP 60 1026 → 80 [RST, ACK] Seq=0 Ack=1 Win=512 Len=0

This problem randomly occur not always especially on first attempt to connect to server. Thanks

[MonirA1990]

Also if I try to connect with www.google.com, sometimes connection failed.

Initialize Ethernet with DHCP: DHCP assigned IP 192.168.1.3 connecting to www.google.com... connection failed

disconnecting. Received 0 bytes in 0.0000, rate = 0.00 kbytes/second

[MonirA1990]

Here is another log: 29332 819.212896 192.168.1.9 192.168.1.8 TCP 60 [TCP Port numbers reused] 1026 → 8080 [SYN] Seq=0 Win=512 Len=0 MSS=512 29333 819.213093 192.168.1.8 192.168.1.9 TCP 58 8080 → 1026 [SYN, ACK] Seq=0 Ack=1 Win=65392 Len=0 MSS=1460 29342 820.213826 192.168.1.8 192.168.1.9 TCP 58 [TCP Retransmission] 8080 → 1026 [SYN, ACK] Seq=0 Ack=1 Win=65392 Len=0 MSS=1460 29349 820.963172 192.168.1.9 192.168.1.8 TCP 60 [TCP Retransmission] 1026 → 8080 [SYN] Seq=0 Win=512 Len=0 MSS=512 29350 822.216510 192.168.1.8 192.168.1.9 TCP 58 [TCP Retransmission] 8080 → 1026 [SYN, ACK] Seq=0 Ack=1 Win=65392 Len=0 MSS=1460 29356 824.211855 192.168.1.9 192.168.1.8 TCP 60 [TCP Retransmission] 1026 → 8080 [SYN] Seq=0 Win=512 Len=0 MSS=512 29371 826.215955 192.168.1.8 192.168.1.9 TCP 58 [TCP Retransmission] 8080 → 1026 [SYN, ACK] Seq=0 Ack=1 Win=65392 Len=0 MSS=1460 29373 830.460283 192.168.1.9 192.168.1.8 TCP 60 [TCP Retransmission] 1026 → 8080 [SYN] Seq=0 Win=512 Len=0 MSS=512 29408 842.756504 192.168.1.9 192.168.1.8 TCP 60 1026 → 8080 [RST, ACK] Seq=0 Ack=4264638797 Win=512 Len=0

[MonirA1990]

Thanks for you Blue Pill SPI is 3.3v and do not need level conversion

[JAndrassy]

could you show your sketch or some test sketch with the same problem?

[MonirA1990]

Here is the code:

/* Web client

This sketch connects to a website (http://www.google.com) using an Arduino Wiznet Ethernet shield.

Circuit:

• Ethernet shield attached to pins 10, 11, 12, 13

  created 18 Dec 2009 by David A. Mellis modified 9 Apr 2012 by Tom Igoe, based on work by Adrian McEwen

  */

include

include

// Enter a MAC address for your controller below. // Newer Ethernet shields have a MAC address printed on a sticker on the shield byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };

// if you don't want to use DNS (and reduce your sketch size) // use the numeric IP instead of the name for the server: IPAddress server(192,168,1,8); // numeric IP for Google (no DNS) //char server[] = "www.google.com"; // name address for Google (using DNS)

// Set the static IP address to use if the DHCP fails to assign IPAddress ip(192, 168, 1, 1); IPAddress myDns(192, 168, 1, 1);

// Initialize the Ethernet client library // with the IP address and port of the server // that you want to connect to (port 80 is default for HTTP): EthernetClient client;

// Variables to measure the speed unsigned long beginMicros, endMicros; unsigned long byteCount = 0; bool printWebData = true; // set to false for better speed measurement

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

// 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 }

// start the Ethernet connection: Serial.println("Initialize Ethernet with DHCP:"); if (Ethernet.begin(mac) == 0) { Serial.println("Failed to configure Ethernet using DHCP"); // 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."); } // try to congifure using IP address instead of DHCP: Ethernet.begin(mac, ip, myDns); } else { Serial.print(" DHCP assigned IP "); Serial.println(Ethernet.localIP()); } // give the Ethernet shield a second to initialize: delay(1000); Serial.print("connecting to "); Serial.print(server); Serial.println("...");

// if you get a connection, report back via serial: if (client.connect(server, 80)) { Serial.print("connected to "); Serial.println(client.remoteIP()); // Make a HTTP request: client.println("GET /index.php HTTP/1.1"); client.println("Host: 192.168.1.8"); client.println("Connection: close"); client.println(); } else { // if you didn't get a connection to the server: Serial.println("connection failed"); } beginMicros = micros(); }

void loop() { // if there are incoming bytes available // from the server, read them and print them: int len = client.available(); if (len > 0) { byte buffer[500]; if (len > 500) len = 500; client.read(buffer, len); if (printWebData) { Serial.write(buffer, len); // show in the serial monitor (slows some boards) } byteCount = byteCount + len; }

// if the server's disconnected, stop the client: if (!client.connected()) { endMicros = micros(); Serial.println(); Serial.println("disconnecting."); client.stop(); Serial.print("Received "); Serial.print(byteCount); Serial.print(" bytes in "); float seconds = (float)(endMicros - beginMicros) / 1000000.0; Serial.print(seconds, 4); float rate = (float)byteCount / seconds / 1000.0; Serial.print(", rate = "); Serial.print(rate); Serial.print(" kbytes/second"); Serial.println();

// do nothing forevermore:
while (true) {
  delay(1);
}

} }

Thanks

[MonirA1990]

The problem when trying to connect to server in client.connect(server, 80) I try to change port of server but same behavior

[JAndrassy]

please try the EthernetENC library

and use

len = client.read(buffer, 500);

[JAndrassy]

so I tested it. it is only a problem of Wireshark's packet analyse. it doesn't know the device was reset. reset Wireshark session too.