Tiago Oliveira

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10 years, 3 months ago.

Connection TCP/IP Mbed - PC Problem

Hi everyone,

I'm trying to do some TCP/IP connection between PC and a mbed (NPX LPC 1768) but i'm having some problems.

My first step is simple, just send from pc to mbed some string and receive other. But i'm having problems with the connect. My code in Mbed is this:

#include "mbed.h"
#include "EthernetInterface.h"
#include "string.h"

DigitalOut myled(LED1);
DigitalOut myled2(LED2);



///Just to test sending 1010
 void passTeclado(char *pass){
        if (true)sprintf(pass,"1");
        if (true)sprintf(pass,"%s0",pass);
        if (true)sprintf(pass,"%s1",pass);
        if (true)sprintf(pass,"%s0",pass);
} 
bool compare(char passReceived[4], char pass[4], char ans[1])  {
          bool correct;    
          
          if(passReceived[0]==pass[0] && passReceived[1]==pass[1] && passReceived[2]==pass[2] && passReceived[3]==pass[3]){
             myled=1;
             ans[0] = '1';
             correct=true;
          }
          else {
             myled2=1; 
             ans[0] = '1';
             correct=false;    
        }
        
    return correct;  
}  

int main() {
    
    char inputBuffer[4];
    char outputBuffer[4];
    char answer[1];
    
    EthernetInterface eth;
    TCPSocketConnection sock;
    
    eth.init("192.168.1.102", "255.255.255.0","192.168.1.100");
    eth.connect();
    sock.connect("192.168.1.101", 5541);
    //receive the data
    sock.receive(inputBuffer,sizeof(inputBuffer));
    //1010 to outputbuffer
    passTeclado(outputBuffer);
    //compare outputbuffer and inputbuffer, give an answer
    compare(inputBuffer,outputBuffer,answer);
    //send the answer
    sock.send(answer,sizeof(answer));    
    //close all
    sock.close(); 
    eth.disconnect(); 
    return 0;
    
}

In my pc code (java) in my main ( and for dont copy everything):

	//Conection With Port
		TCP server = new TCP(5541);
		//Create a new server
		server.newConnection();
		//Is connected?
		System.out.print(server.connect()+"\n");
		//Send to mbed
	    server.sendstring("1111");
		//Read the received and print
	    String read;
		read = server.receive();
		System.out.print(read+"\n");	
		//close all
		server.fechar();
		server.closeServ();
		System.exit(0);

I don't know why but when i try the newConnection:

public void newConnection() throws IOException{
		sock = serverSocket.accept();
		inputStream = new DataInputStream(sock.getInputStream());
		outputStream = new DataOutputStream(sock.getOutputStream());
	}

The code don't do anything, stopped in line "sock = serverSocket.accept();"..

I configured my ethernet cable(ip,gateway..) with the specifications on my mbed code, and i think ethernetcable is correctly turn on, on my mbed:

green/white -> TD+

green -> TD-

orange/white -> RD+

orange -> RD-

Can someone know what is this error?

PS: Sorry about some error on my english.

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