TCP client/server -> SERVER PROBLEM

Zawislak · April 22, 2021, 1:41pm

Hello
I am making tcp client/server and for now I can read the incoming packages over tcp but I can not send any messages.

#include <SPI.h>
#include <UIPEthernet.h>
String serial_data;
char incomingByte = 0;
char s = 0;
int choice = 0;
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress server(10, 5, 5, 10); // numeric IP for Google (no DNS)
IPAddress ip(10, 5, 5, 106);
EthernetClient client;

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  // start the Ethernet connection:
  Ethernet.begin(mac, ip);
  // give the Ethernet shield a second to initialize:
  delay(1000);
  Serial.println("connecting...");
  // if you get a connection, report back via serial:
  if (client.connect(server, 9876)) {
    Serial.println("connected");
  }
  else {
    // if you didn't get a connection to the server:
    Serial.println("connection failed");
  }
  Serial.println("Wcisnij a aby odczytywac pakiety");
  Serial.println("Wcisnij b aby wysylac pakiety");
}


void loop() {
Ethernet.maintain();
  // Read serial input:
  if (Serial.available() > 0)
  {
    incomingByte = Serial.read();
  }


  switch (incomingByte) {

    case 'a':
      //Serial.print("Logi");
      if (client.available())   {

        char c = client.read();

        Serial.print(c);
        Serial.print("");
      }
      if (!client.connected()) {
        client.connect(server, 9876);
      }
      break;

    case 'b':
      //Serial.print("Wpisz komendę");
      if (client.available())   {
        if (Serial.available() > 0) {
       Serial.println("Sent..");
    serial_data = String(Serial.read());
    client.print(serial_data);
        }
      }
      if (!client.connected()) {
        client.connect(server, 9876);
      }
      break;

Juraj · April 22, 2021, 2:06pm

add Ethernet.maintain(); as first in loop()

Zawislak · April 22, 2021, 2:07pm

Added it, nothing changed.

#include <SPI.h>
#include <UIPEthernet.h>
String serial_data;
char incomingByte = 0;
char s = 0;
int choice = 0;
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress server(10, 5, 5, 10); // numeric IP for Google (no DNS)
IPAddress ip(10, 5, 5, 106);
EthernetClient client;

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  // start the Ethernet connection:
  Ethernet.begin(mac, ip);
  // give the Ethernet shield a second to initialize:
  delay(1000);
  Serial.println("connecting...");
  // if you get a connection, report back via serial:
  if (client.connect(server, 9876)) {
    Serial.println("connected");
  }
  else {
    // if you didn't get a connection to the server:
    Serial.println("connection failed");
  }
  Serial.println("Wcisnij a aby odczytywac pakiety");
  Serial.println("Wcisnij b aby wysylac pakiety");
}


void loop() {
Ethernet.maintain();
  // Read serial input:
  if (Serial.available() > 0)
  {
    incomingByte = Serial.read();
  }


  switch (incomingByte) {

    case 'a':
      //Serial.print("Logi");
      if (client.available())   {

        char c = client.read();

        Serial.print(c);
        Serial.print("");
      }
      if (!client.connected()) {
        client.connect(server, 9876);
      }
      break;

    case 'b':
      //Serial.print("Wpisz komendę");
      if (client.available())   {
        if (Serial.available() > 0) {
       Serial.println("Sent..");
    serial_data = String(Serial.read());
    client.print(serial_data);
        }
      }
      if (!client.connected()) {
        client.connect(server, 9876);
      }
      break;
  }
}

Juraj · April 22, 2021, 2:19pm

so if you enter in Serial Monitor bA, A is not sent?

Zawislak · April 22, 2021, 2:20pm

For now the choosing option is working
i press a - i read from server
i press b i jump to "b" case
BUT i don't know how to properly send soem packages to the server

Juraj · April 22, 2021, 2:26pm

I don't know what you want to do. your code receives one character if 'a' is sent from Serial Monitor and sends one character if 'b' is sent from Serial Monitor.
you could replace if (Serial.available()) with while (Serial.available()) to send more then one character after b. but I guess even then it would not send everything because of gaps between characters sent from Serial Monitor

Zawislak · April 22, 2021, 2:28pm

In case a:
I read the incoming messages from the server
In case b:
I want to SEND messages to the server

Juraj · April 22, 2021, 3:39pm

read() reads only one character.

see this example

github.com

arduino-libraries/Ethernet/blob/master/examples/TelnetClient/TelnetClient.ino

/*
 Telnet client

 This sketch connects to a telnet server (http://www.google.com)
 using an Arduino WIZnet Ethernet shield.  You'll need a telnet server
 to test this with.
 Processing's ChatServer example (part of the Network library) works well,
 running on port 10002. It can be found as part of the examples
 in the Processing application, available at
 https://processing.org/

 Circuit:
 * Ethernet shield attached to pins 10, 11, 12, 13

 created 14 Sep 2010
 modified 9 Apr 2012
 by Tom Igoe
 */

#include <SPI.h>

This file has been truncated. show original

Zawislak · April 22, 2021, 5:09pm

I see they are sending packages like hits:

while (Serial.available() > 0) {
    char inChar = Serial.read();
    if (client.connected()) {
      client.print(inChar);
    }
  }

so it looks just like my code...
Tried it anyway it does not work.
I use TCPIPbuilder app to listen on that port and when i send packets from the server (fq2 camera) it appears both in this app and in my serial (when i choose "a")
But if I type in my command "b case" nothing appears in TCPIPbuilder so I guess i do not send anything...

Juraj · April 22, 2021, 5:25pm

do you have while?

Zawislak · April 22, 2021, 5:30pm

Okay let's take it easier.
Let's make JUST sending option (if it works i will add it to the main program).

code:

#include <SPI.h>
#include <UIPEthernet.h>
//#include "packet.h"
String serial_data;
char incomingByte = 0;
char s = 0;
int choice = 0;
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress server(10, 5, 5, 10); // numeric IP for Google (no DNS)
IPAddress ip(10, 5, 5, 106);
EthernetClient client;

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  // start the Ethernet connection:
  Ethernet.begin(mac, ip);
  // give the Ethernet shield a second to initialize:
  delay(1000);
  Serial.println("connecting...");
  // if you get a connection, report back via serial:
  if (client.connect(server, 9876)) {
    Serial.println("connected");
  }
  else {
    // if you didn't get a connection to the server:
    Serial.println("connection failed");
  }

 
}
void loop() {
 Ethernet.maintain();
   while (Serial.available() > 0) {
    Serial.println("Type command");
    char inChar = Serial.read();
    if (client.connected()) {
      
      client.print(inChar);
      client.write(inChar);
      Serial.println("Sent");
    }
  }
      if (!client.connected()) {
        client.connect(server, 9876);
      }

}

And below i will put a screenshot in which you see that if i send packages from my server (smart camera) the logs appear there BUT as you can see my program went through ("Sent package" and "Sent" is a confirmation and nothing appears

Juraj · April 22, 2021, 6:29pm

what did you type?

Zawislak · April 22, 2021, 6:32pm

I tired everything one letter, one number words, numbers evberything. nothing works. I think i must send it in other way, like a "package" with specific length etc but that's just my idea i do not know how to do it

Juraj · April 22, 2021, 6:33pm

you send to 10. 5. 5.10, not to 10.5.5.101

Zawislak · April 22, 2021, 6:36pm

Yes and that's where i want to send it. 10.5.5.10 is the camera's adress.

system · August 20, 2021, 6:37pm

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TCP client/server -> SERVER PROBLEM

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