ESP8266 Community Forum

- Fri Dec 04, 2015 11:09 am #35648 Hi,
I'm trying to read some data from simple web page (https://pure-caverns-1350.herokuapp.com/stan)
It should respond with "0" or "1" (later I would like to turn output high or low regarding to this, but later...)

I have a problem with this code:

Code: Select all/*
#include <ESP8266WiFi.h>

const char* ssid     = "WiwoNET";
const char* password = "123456";

const char* host = "pure-caverns-1350.herokuapp.com";

void setup() {
  Serial.begin(115200);
  delay(10);

  // We start by connecting to a WiFi network

  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
 
  WiFi.begin(ssid, password);
 
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected"); 
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

int value = 0;

void loop() {
  delay(5000);
  ++value;

  Serial.print("connecting to ");
  Serial.println(host);
 
  // Use WiFiClient class to create TCP connections
  WiFiClient client;
  const int httpPort = 80;
  if (client.connect(host, httpPort)) {
    Serial.println("connection success");
  }
  else {
    Serial.println("connection failed");
  }
 
  // We now create a URI for the request
  String url = "/stan";
 
  Serial.print("Requesting URL: ");
  Serial.println(url);
 
  // This will send the request to the server
  client.print("GET " + url + " HTTP/1.1\r\n" +
              "Host: " + host +"\r\n");
  delay(10);
 
  // Read all the lines of the reply from server and print them to Serial
  Serial.println("Informacja zwrotna:");
  while(client.available()){
    String line = client.readStringUntil('\r');
    Serial.print(line);
  }
 
  Serial.println();
  Serial.println("closing connection");
}


In serial monitor I have only:

Code: Select allConnecting to WiwoNET
...........
WiFi connected
IP address:
192.168.0.111
connecting to pure-caverns-1350.herokuapp.com
connection success
Requesting URL: /stan
Informacja zwrotna:

closing connection


But what is weird I don't see anything in heroku's log...
I tested it with postman and get request works fine when I'm not using ESP-01

Where should I look for problem?
Thank you in advance for any kind of help!

- Sat Dec 05, 2015 6:02 am #35702 Could it be the old "delay(10);" after the client.print problem? Try increasing 10 to a few hundred or better still do this.

Really we should get the WiFiClient example that comes with the IDE changed as so many people copy that and then hit this problem.