Python and Arduino - Comunication throw Ethernet

Hi to everybody! I'm trying to chat with Arduino, with the example sketch "ChatServer". I send messages with Python, using this code:

import socket
client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client_socket.connect(("192.168.1.177", 23))
  
client_socket.send("Hello!")
a = client_socket.recv(30)
print a
client_socket.close()

I send and receive data, but in the Serial monitor I don't read "Hello!", but strange characters.. Also receiving the data from Arduino, printing a, strange characters..

Where is the problem? Marco

Where is the problem?

Possibly in the code you didn't show.

Sorry Zoomkat, I didn't show it because it is the sketch example, original sketch examplet who everybody can find in the Idle of Arduino..

Perhaps it is an issue with your python code and the arduino is just reporting what it receives.

I send and receive data, but in the Serial monitor I don’t read “Hello!”, but strange characters…

It might be just sample code that we all could look at, but you have the code there in front of you. Post it. We can’t see what baud rate the Arduino is using, or what baud rate the serial monitor is set to.

They have to match, you know, or you get “strange characters”.

Here the code:

/*
 Chat  Server
 
 A simple server that distributes any incoming messages to all
 connected clients.  To use telnet to  your device's IP address and type.
 You can see the client's input in the serial monitor as well.
 Using an Arduino Wiznet Ethernet shield. 
 
 Circuit:
 * Ethernet shield attached to pins 10, 11, 12, 13
 * Analog inputs attached to pins A0 through A5 (optional)
 
 created 18 Dec 2009
 by David A. Mellis
 modified 9 Apr 2012
 by Tom Igoe
 
 */

#include <SPI.h>
#include <Ethernet.h>

// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network.
// gateway and subnet are optional:
byte mac[] = { 
  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192,168,1, 177);
IPAddress gateway(192,168,1, 1);
IPAddress subnet(255, 255, 0, 0);


// telnet defaults to port 23
EthernetServer server(23);
boolean alreadyConnected = false; // whether or not the client was connected previously

void setup() {
  // initialize the ethernet device
  Ethernet.begin(mac, ip, gateway, subnet);
  // start listening for clients
  server.begin();
 // Open serial communications and wait for port to open:
  Serial.begin(9600);
   while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }


  Serial.print("Chat server address:");
  Serial.println(Ethernet.localIP());
}

void loop() {
  // wait for a new client:
  EthernetClient client = server.available();

  // when the client sends the first byte, say hello:
  if (client) {
    if (!alreadyConnected) {
      // clead out the input buffer:
      client.flush();    
      Serial.println("We have a new client");
      client.println("Hello, client!"); 
      alreadyConnected = true;
    } 

    if (client.available() > 0) {
      // read the bytes incoming from the client:
      char thisChar = client.read();
      // echo the bytes back to the client:
      server.write(thisChar);
      // echo the bytes to the server as well:
      Serial.write(thisChar);
    }
  }
}

Thank you!!!

  Serial.begin(9600);

Is this the same speed that is selected in the serial monitor?

      char thisChar = client.read();
      // echo the bytes back to the client:
      server.write(thisChar);
      // echo the bytes to the server as well:
      Serial.write(thisChar);

Why are you not using Serial.print() to print the text?

PaulS: Is this the same speed that is selected in the serial monitor?

Yes!

PaulS: Why are you not using Serial.print() to print the text?

Because I wouldn't modify the example sketchs! Now I try with Serial.print().