Problem with TCP/IP communication

Using Arduino Networking, Protocols, and Devices
#1

Hello guys!

I have a problem, the code below simulate an aquisition of a waveform by a TCP/IP Server, then the results have to be send to a client.

#include <chipKITEthernet.h>
#include <SPI.h>

byte MAC[]= {0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
byte IP[]= {192,168,1,3};
Server server (1369);


boolean refresh = LOW;
const float pi = 3.1415;
float t=0, V1[999];

Client client;

void setup()
{
  Ethernet.begin(MAC, IP);
  server.begin();
  Serial.begin(9600);
  delay(1000);
}

void loop()
{
  client = server.available();
  if(client.available())
  {
    Serial.println("Reading client");
    Serial.println(" ");
    char c = client.read();
    Serial.print(c);
    if(c==1)
    {
      refresh = HIGH;
    }
  }
    
  if(client.connected() && refresh)
  {
    refresh = LOW;
    Serial.println("Conectado ao servidor, inciando o envio de dados");
    Serial.println(" ");
    aquisition();    
  }
  Ethernet.PeriodicTasks();
}

void aquisition()
{
  for(int j=0;j<1000;j++)
    {
      V1[j] = 10*sin(2*pi*60*t) + 0.5*sin(3*2*pi*60*t) + 0.7*sin(5*2*pi*60*t) + 1.2*sin(7*2*pi*60*t);
      t = t + 0.0002;
    }
    Serial.println("ADC simulation done, sending data");
    Serial.println(" ");
    
    for(int j=0;j<1000;j++)
    {
      client.println(V1[j]);
    }
    Serial.println("Aquisition done");
    Serial.println(" ");
}

I can only do the routine 3-4 times at the most, then the code is stopped here:

for(int j=0;j<1000;j++)
    {
      client.println(V1[j]); // <--- the code stops here after 3-4 times
    }

I tried almost everything possible, but I can’t figure out what’s going on.

Anything?

Best regards!!!

#2

How many bytes are you transferring this way? Bear in mind that each call to client.println() generates another packet.

for(int j=0;j<1000;j++)
{
   client.println(V1[j]); // <--- the code stops here after 3-4 times
}

Do you want to know? That is 1000 packets for a total of 51,000 bytes. Three characters per packet, and a 48 byte header for each packet. That is a 3000 byte payload carried by 48,000 bytes in the headers.

I recommend sending at least 60 bytes per packet.

#3

Thanks for the answer!

I don't think that the problem the is size of the packts, beacause I already did the code transmit four times 6 waveforms of (1000 samples each). Thats why I don't know what's the problem.
The data that I transmit in client.println is a FLOAT.

Thanks again!

#4

I think you need to rethink that. A thousand packets is too many. You can keep trying other things tho.

#5

But I don't understand, because I send the data and read in the client application, then a new cicle begins, why it can't do the routine again if it did once, twice or three times?

Thanks for helping me!

#6

use client.flush() after you are done with println(). It worked for me.

#7