TCPClient example from Documentation not working

Troubleshooting
1

Hey guys, I am new to retrieving information from the web, and am trying to run the code from the TCP example from Documentation:


// EXAMPLE USAGE

TCPClient client;
byte server[] = { 74, 125, 224, 72 }; // Google
void setup()
{
  Serial.begin(9600);
  delay(1000);
  Serial.println("connecting...");

  if (client.connect(server, 80))
  {
    Serial.println("connected");
    client.println("GET /search?q=unicorn HTTP/1.0");
    client.println("Host: www.google.com");
    client.println("Content-Length: 0");
    client.println();
  }
  else
  {
    Serial.println("connection failed");
  }
}

void loop()
{
  if (client.available())
  {
    char c = client.read();
    Serial.print(c);
  }

  if (!client.connected())
  {
    Serial.println();
    Serial.println("disconnecting.");
    client.stop();
    for(;;);
  }
}```

I dont know what is wrong but I dont see anything on my Serial. When I take out the if statement if(client.available())
Then the code that was once under the if statement is run, but the information retrieved is still not shown.
2 
    TCPClient client;
byte server[] = { 74, 125, 224, 72 }; // Google
void setup()
{
  Serial.begin(9600);
  delay(1000);
  Serial.println("connecting...");

  if (client.connect(server, 80))
  {
    Serial.println("connected");
    client.println("GET /search?q=unicorn HTTP/1.0");
    client.println("Host: www.google.com");
    client.println("Content-Length: 0");
    client.println();
  }
  else
  {
    Serial.println("connection failed");
  }
}

void loop()
{
  if (client.available())
  {
    char c = client.read();
    Serial.print(c);
  }

  if (!client.connected())
  {
    Serial.println();
    Serial.println("disconnecting.");
    client.stop();
    for(;;);
  }
}

Well i can´t really help you, but i can say that the code works fine for me !

3

what do you see on your serial after you run this code?

1 Like
4

I get the html code of the site. It looks like

1 Like
5

I think i might have found the problem.

It's not an issue with the documentation. The TCPClient was called twice.

6

If he had done it that way he would not be able to flash the core due Error´s.

/google.cpp:2:11: error: redefinition of ‘TCPClient client’

/google.cpp:1:11: error: ‘TCPClient client’ previously declared here
make: *** [/google.o] Error 1

Error: Could not compile. Please review your code.

7

I compared your code and his that was the only difference i noticed :wink:

If we can find the problem, that will help fix the docs if the examples isn’t working.

Thanks!

1 Like
8

oops, I had no idea that I copied that twice. In my original code, the initialization is done only once!

in my serial, it says “connection failed. disconnecting.” I don’t know what is wrong :frowning:
Also, when I flash this code, my Spark is unable to flash itself again. I don’t know why that is. I have to hard reset it for it to work again! ughh!

9

Maybe this should help :wink:

1 Like
10

Yes! Thank you so much! It works fine after that fix! <3

1 Like