SparkFun Forums

[Ramirez]

Hi all,

I am trying to write an Arduino sketch (that will be uploaded to an Arduino Uno combined with a CC3000 wireless module by Sparkfun).
This sketch should connect to a server PC, and send information via TCP/IP in the form of "1" or "0".

The problem is that the Server program (run separately on a PC with an IP of 192.168.2.13 [not static]),
does not seem to identify that the CC3000 (the client), is trying to establish a connection.

The current Arduino sketch (Client) is as below.
Of course I changed the "SSID" and "PASSWORD" with the actual SSID and PASSWORD... The CC3000 initializes and connects to the local WiFi with no problem.


Client Code (Arduino UNO + CC3000 WiFi Side):

Code: Select all

//////////////// WIFI INITIALIZATION //////////////////
/****************************************************************/
#include <SPI.h>
#include <SFE_CC3000.h>
#include <SFE_CC3000_Client.h>

// Pins
#define CC3000_INT      2   // Needs to be an interrupt pin (D2/D3)
#define CC3000_EN       7   // Can be any digital pin
#define CC3000_CS       10  // Preferred is pin 10 on Uno

// Connection info data lengths
#define IP_ADDR_LEN     4   // Length of IP address in bytes

// Constants
char ap_ssid[] = "SSID";            // SSID of network
char ap_password[] = "PASSWORD";          // Password of network
unsigned int ap_security = WLAN_SEC_WPA2; // Security of network
// ap_security can be any of: WLAN_SEC_UNSEC, WLAN_SEC_WEP, 
// WLAN_SEC_WPA, or WLAN_SEC_WPA2
unsigned int timeout = 10000;          // Milliseconds
char server[] = "192.168.2.13";        // Remote server 

// Global Variables
SFE_CC3000 wifi = SFE_CC3000(CC3000_INT, CC3000_EN, CC3000_CS);
SFE_CC3000_Client client = SFE_CC3000_Client(wifi);
int ConnectionIndicator;

/****************************************************************/
//////////////// LDR INITIALIZATION //////////////////
/****************************************************************/
int LDR = 0;     //analog pin to which LDR is connected, here we set it to 0 so it means A0
int LDRValue = 0;      //that’s a variable to store LDR values
int light_sensitivity = 500;    //This is the approx value of light surrounding your LDR
boolean Toilet_Stat;
/****************************************************************/



void setup()
{
//////////////// WIFI SETUP //////////////////  
/****************************************************************/

	ConnectionInfo connection_info;
	int i;

	// Initialize Serial port
	Serial.begin(115200);
	Serial.println();
	Serial.println("---------------------------");
	Serial.println("SparkFun CC3000 - WebClient");
	Serial.println("---------------------------");

	// Initialize CC3000 (configure SPI communications)
	if (wifi.init())
	{
		Serial.println("CC3000 initialization complete");
	}

	else
	{
		Serial.println("Something went wrong during CC3000 init!");
	}

	// Connect using DHCP
	Serial.print("Connecting to SSID: ");
	Serial.println(ap_ssid);
	if (!wifi.connect(ap_ssid, ap_security, ap_password, timeout))
	{
		Serial.println("Error: Could not connect to AP");
	}

	// Gather connection details and print IP address
	if (!wifi.getConnectionInfo(connection_info))
	{
		Serial.println("Error: Could not obtain connection details");
	}

	else
	{
		Serial.print("IP Address: ");
		for (i = 0; i < IP_ADDR_LEN; i++)
		{
			Serial.print(connection_info.ip_address[i]);
			if (i < IP_ADDR_LEN - 1)
			{
				Serial.print(".");
			}
		}
		Serial.println();
	}

	// Make a TCP connection to remote host
	Serial.print("Connecting with Server: ");
	Serial.println(server);

	ConnectionIndicator = client.connect(server, 80);
	Serial.println(ConnectionIndicator); //Returns an int (1, -1, -2, -3, -4) indicating connection status:
	//SUCCESS (1)
	//TIMED_OUT (-1)
	//INVALID_SERVER (-2)
	//TRUNCATED  (-3)
	//INVALID_RESPONSE (-4)
	
	if (ConnectionIndicator==1)
	{
		Serial.println("Success: TCP connection Established!");
	}
	else if (ConnectionIndicator <= -1)
	{
		Serial.println("Error: Could not make a TCP connection");
	}

	/****************************************************************/
	//////////////// LDR SETUP //////////////////  
	/****************************************************************/
	
			
		pinMode(13, OUTPUT);   //Use 13 because there is already a built in yellow LED in Arduino which shows output when pin 13 is enabled.
	
}


void loop()
{
	LDRValue = analogRead(LDR);//reads the ldr’s value through LDR 

	if (LDRValue>500)
	{
		Toilet_Stat = 0;
		Serial.println(LDRValue);//prints the LDR values to serial monitor
		Serial.println(Toilet_Stat);
		client.write(Toilet_Stat);
	}
	else
	{
		Toilet_Stat = 1;
		Serial.println(LDRValue);//prints the LDR values to serial monitor
		Serial.println(Toilet_Stat);
		client.write(Toilet_Stat);
	}

	if (LDRValue > light_sensitivity)
	{
		digitalWrite(13, LOW);
	}
	else
	{
		digitalWrite(13, HIGH);
	}
	delay(1000); 
	//This is the speed by which LDR sends value to arduino   
	/****************************************************************/
}

Server Code (Computer Side):
Written in C#

Code: Select all

//
/*   Server Program    */

using System;
using System.Text;
using System.Net;
using System.Net.Sockets;

public class serv
{
    public static void Main()
    {
        try
        {
            IPAddress ipAd = IPAddress.Parse("192.168.2.13");
            // use local m/c IP address, and 
            // use the same in the client

            /* Initializes the Listener */
            TcpListener myList = new TcpListener(ipAd, 80);

            /* Start Listeneting at the specified port */
            myList.Start();

            Console.WriteLine("The server is running at port 80...");
            Console.WriteLine("The local End point is  :" +
                              myList.LocalEndpoint);
            Console.WriteLine("Waiting for a connection.....");

            Socket s = myList.AcceptSocket();
            Console.WriteLine("Connection accepted from " + s.RemoteEndPoint);

            byte[] b = new byte[100];
            int k = s.Receive(b);
            Console.WriteLine("Recieved...");
            for (int i = 0; i < k; i++)
                Console.Write(Convert.ToChar(b[i]));

            ASCIIEncoding asen = new ASCIIEncoding();
            s.Send(asen.GetBytes("The string was recieved by the server."));
            Console.WriteLine("\nSent Acknowledgement");
            /* clean up */
            s.Close();
            myList.Stop();

        }
        catch (Exception e)
        {
            Console.WriteLine("Error..... " + e.StackTrace);
        }
    }

}

I guess the problematic section with the Arduino code, is this:
I can't seem to understand what is wrong with it, maybe there is something missing...

Code: Select all

	// Make a TCP connection to remote host (server computer)
	Serial.print("Connecting to Server: ");
	Serial.println(server);

	ConnectionIndicator = client.connect(server, 80);
	Serial.println(ConnectionIndicator); // "client.connect" function returns an int (1, -1, -2, -3, -4) indicating connection status:
	//SUCCESS (1)
	//TIMED_OUT (-1)
	//INVALID_SERVER (-2)
	//TRUNCATED  (-3)
	//INVALID_RESPONSE (-4)
	
	if (ConnectionIndicator==1)
	{
		Serial.println("Success: TCP connection Established!");
	}
	else if (ConnectionIndicator <= -1)
	{
		Serial.println("Error: Could not make a TCP connection");
	}

This code line:

Code: Select all

client.connect(server, 80);

Doesn't seem to return one of the values (1, -1, -2, -3, -4)
instead it always returns "0"
which is not even in the options for this function as I understand...

By the way, the C# code (Server part) was taken from here:

http://www.codeproject.com/Articles/141 ... erver-in-C

The server+client code written in this page seems to work perfectly together.

I am puzzled...

Help would be appreciated a lot!

Thanks in Advance.