I'm trying to send a standard http GET request to my website using the NodeMCU example client code however for some reason it is not working.
If I type into my browser: snackrefill.com/GetData.php?username=aaaa&pin=bbbb&cost=cccc then it will successfully connect with the php script and save a data base entry.
The problem is that when I try to do the same using the NodeMCU module it does not work. it seems to be connecting to WiFi and the server just fine but when it sends the request nothing seems to happen.
Am I structuring my request wrong?
#include <ESP8266WiFi.h>
const char* ssid = "BELL473";
const char* password = "XXXXXXX";
const char* host = "ns8451.hostgator.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); //works!
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)) { //works!
Serial.println("connection failed");
return;
}
// We now create a URI for the request
String url = "/GetData.php";
url += "?username=";
url += "aaaa";
url += "&pin=";
url += "bbbb";
url += "&cost=";
url += "cccc";
Serial.print("Requesting URL: ");
Serial.println(url);
// This will send the request to the server
client.print(String("GET ") + url + " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"Connection: close\r\n\r\n");
Serial.println();
Serial.println("closing connection");
}
The reason it was not sending was because the host was wrong, i was pointing to my website nameserver when i should have pointed it to the regular website name. I changed const char* host = "ns8451.hostgator.com"; to const char* host = "snackrefill.com"; and now it works!
Related
Derived from the following code.
I uploaded that code to my ESP8266 and it's all good and okay when I communicate with it with my laptop while my laptop is connected to my network with a LAN cable.
The problem is: when I try to communicate with the ESP with my laptop or phone over Wi-Fi I get ERR_CONNECTION_REFUSED though they rarely work and communicate. I tried another phone another router, and did a factory reset to my router, and all the same.
I know that there is an option in the router that is called AP Isolation and it's been checked and it's disabled.
My question is: What could possibly be the reason for this error ERR_CONNECTION_REFUSED when I communicate with ESP8266 with that code?
If someone could help me I would be pleased as I am stuck in this situation.
The ESP code (same as the link):
#include <ESP8266WiFi.h>
const char* ssid = "*****";
const char* password = "*******";
WiFiServer server(80);
void setup() {
Serial.begin(115200);
Serial.println();
Serial.printf("Connecting to %s ", ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println(" connected");
server.begin();
Serial.printf("Web server started, open %s in a web browser\n", WiFi.localIP().toString().c_str());
}
// prepare a web page to be send to a client (web browser)
// the connection will be closed after completion of the response
// the page will be refreshed automatically every 5 sec
String prepareHtmlPage() {
String htmlPage = String("HTTP/1.1 200 OK\r\n") +
"Content-Type: text/html\r\n" +
"Connection: close\r\n" +
"Refresh: 5\r\n" + "\r\n" +
"<!DOCTYPE HTML>" + "<html>" +
"Analog input: " + String(analogRead(A0)) +
"</html>" + "\r\n";
return htmlPage;
}
void loop() {
WiFiClient client = server.available();
// wait for a client (web browser) to connect
if (client) {
Serial.println("\n[Client connected]");
while (client.connected()) {
// read line by line what the client (web browser) is requesting
if (client.available()) {
String line = client.readStringUntil('\r');
Serial.print(line);
// wait for end of client's request, that is marked with an empty line
if (line.length() == 1 && line[0] == '\n') {
client.println(prepareHtmlPage());
break;
}
}
}
delay(1); // give the web browser time to receive the data
// close the connection:
client.stop();
Serial.println("[Client disconnected]");
}
}
I hope its not too late and it helps someone in need.
You need to do 2 things
Before WiFi.begin(), you need to add
WiFi.mode(WIFI_STA);
Second, you need to
#include <ESP8266mDNS.h>
in setup()
if (MDNS.begin("esp8266")) {
Serial.println("MDNS responder started");
}
and in loop()
MDNS.update();
Lastly, do not forget to add the following in every server response. Else, you will hit CORS error.
server.sendHeader("Access-Control-Allow-Origin", "*");
Please dont forget to add supporting libraries. Let me know if it works. Demo code would look like the below
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
const char* ssid = "<your SSID>";
const char* password = "<your WIFI Password>>";
int serverPort = 80;
int boardBaud = 115200;
ESP8266WebServer server(serverPort);
void handleRoot() {
server.sendHeader("Access-Control-Allow-Origin", "*");
server.send(200, "text/html", "<h1>Hello World</h1>");
}
void handleNotFound() {
if (server.method() == HTTP_OPTIONS)
{
server.sendHeader("Access-Control-Allow-Origin", "*");
server.sendHeader("Access-Control-Max-Age", "10000");
server.sendHeader("Access-Control-Allow-Methods", "PUT,POST,GET,OPTIONS");
server.sendHeader("Access-Control-Allow-Headers", "*");
server.send(204);
}
else
{
server.send(404, "text/plain", "Error");
}
}
void setup(void) {
Serial.begin(boardBaud);
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
// Wait for connection
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
if (MDNS.begin("esp8266")) {
Serial.println("MDNS responder started");
}
server.on("/", handleRoot);
server.onNotFound(handleNotFound);
server.begin();
Serial.println("HTTP server started");
}
void loop(void) {
server.handleClient();
MDNS.update();
}
I want to connect to an url of a cloud function but isn´t working. someone can see the error? I´m working with an ESP8266 from arduino IDE. I try sending a POST request by postman and it function perfectly, I don´t understan what is the problem with the conection, i always try to connect with out the https and only with http and again in the esp8266 didn´t wotk but in postman does works fine, I do not understant why is this problem
#include <ESP8266WiFi.h>
#include <WiFiClientSecure.h>
const char* ssid = "My wifi";
const char* password = "My Password";
const char* host = "https://us-central1-sensores4bad6.cloudfunctions.net/actualizar";
void setup() {
Serial.begin(9600);
delay(10);
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.mode(WIFI_STA);
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);
WiFiClientSecure client;
const int httpPort = 443;
if (!client.connect(host, httpPort)) {
Serial.println("connection failed");
return;
}
client.print(String("POST ") + host + " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"Connection: close\r\n\r\n");
unsigned long timeout = millis();
while (client.available() == 0) {
if (millis() - timeout > 5000) {
Serial.println(">>> Client Timeout !");
client.stop();
return;
}
}
while (client.available()) {
String line = client.readStringUntil('\r');
Serial.print(line);
}
Serial.println();
Serial.println("closing connection");
}
Try removing the s in https. So:
const char* host = "http://us-central1-sensores4bad6.cloudfunctions.net/actualizar";
instead of
const char* host = "https://us-central1-sensores4bad6.cloudfunctions.net/actualizar";
Hi i am trying to test a value form nodemcu board i am using arduino ide to code and have modified the WIFIClient example to send a value to my localhost using GET. it gives me bad request error. any help or suggestion is appreciated
Modified WIFIClinet
#include <ESP8266WiFi.h>
const char* ssid = "ssid";
const char* password = "pwd";
const char* host = "http://10.0.0.39/edu/arduino.php";
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 failed");
return;
}
// We now create a URI for the request
String url ="?v=we";
//
//
Serial.print("Requesting URL: ");
Serial.println(url);
// This will send the request to the server
client.print(String("GET ") + url + " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"Connection: close\r\n\r\n");
//
unsigned long timeout = millis();
while (client.available() == 0) {
if (millis() - timeout > 5000) {
Serial.println(">>> Client Timeout !");
client.stop();
return;
}
}
// Read all the lines of the reply from server and print them to Serial
while(client.available()){
String line = client.readStringUntil('\r');
Serial.print(line);
}
Serial.println();
Serial.println("closing connection");
}
Output from serial monitor
connecting to http://10.0.0.39/edu/arduino.php
Requesting URL: ?v=we
HTTP/1.0 400 Bad Request
Server: httpd
Date: Sat, 01 Jan 2011 22:02:19 GMT
Content-Type: text/html
Connection: close
<HTML><HEAD><TITLE>400 Bad Request</TITLE></HEAD>
<BODY BGCOLOR="#cc9999"><H4>400 Bad Request</H4>
Bad filename.
</BODY></HTML>
I hope this is helpful for people running this on local host i changed
const char* host = "http://10.0.0.39/edu/arduino.php";
to
const char* host = "10.0.0.39";
and
String url ="?v=we";
to
String url ="/edu/arduino.php?v=we";
I'm working on the ESP8266 ESP-01 WiFi module programmed with Arduino IDE to send GET request to a URL and read the contents.
Trying to modify the below code which uses the ESP8266WiFi library, I'm not clear what to replace for host. Should i put my URL in host or something else?
Also how to edit the line.
client.print(String("GET ") + url + " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"Connection: close\r\n\r\n");
#include <ESP8266WiFi.h>
const char* ssid = "your-ssid";
const char* password = "your-password";
const char* host = "data.sparkfun.com";
const char* streamId = "....................";
const char* privateKey = "....................";
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 failed");
return;
}
// We now create a URI for the request
String url = "/input/";
url += streamId;
url += "?private_key=";
url += privateKey;
url += "&value=";
url += value;
Serial.print("Requesting URL: ");
Serial.println(url);
// This will send the request to the server
client.print(String("GET ") + url + " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"Connection: close\r\n\r\n");
unsigned long timeout = millis();
while (client.available() == 0) {
if (millis() - timeout > 5000) {
Serial.println(">>> Client Timeout !");
client.stop();
return;
}
}
// Read all the lines of the reply from server and print them to Serial
while(client.available()){
String line = client.readStringUntil('\r');
Serial.print(line);
}
Serial.println();
Serial.println("closing connection");
}
Your line client.print(String("GET ") + url + " HTTP/1.1\r\n" + "Host: " + host + "\r\n" + "Connection: close\r\n\r\n"); is OK. You don't need to change it.
For host you have to provide domain name or IP address. Eg. const char* host = "example.com";.
Example
If you want to get http://stackoverflow.com/questions/39707504/how-to-use-esp8266wifi-library-get-request-to-obtain-info-from-a-website you should have:
const char* host = "stackoverflow.com";
String url = "/questions/39707504/how-to-use-esp8266wifi-library-get-request-to-obtain-info-from-a-website";
I have a problem, i execute this simple code - send an http request :
include <ESP8266WiFi.h>
//Router 1 - Livebox
const char* ssid = "Livebox-9e38";
const char* password = "xxxxxxxxxxx";
//Router 2 - Android phone
//const char* ssid = "DARKSIDE";
//const char* password = "xxxxxxxxx";
// server address:
char server[] = "www.arduino.cc";
//IPAddress server(64,131,82,241);
WiFiClient client;
unsigned long lastConnectionTime = 0; // last time you connected to the server, in milliseconds
const unsigned long postingInterval = 10L * 1000L; // delay between updates, in milliseconds
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());
}
void httpRequest() {
// close any connection before send a new request.
// This will free the socket on the WiFi shield
client.stop();
// if there's a successful connection:
if (client.connect(server, 80)) {
Serial.println("connecting...");
// send the HTTP PUT request:
client.println("GET /latest.txt HTTP/1.1");
client.println("Host: www.arduino.cc");
client.println("User-Agent: ArduinoWiFi/1.1");
client.println("Connection: close");
client.println();
// note the time that the connection was made:
lastConnectionTime = millis();
} else {
// if you couldn't make a connection:
Serial.println("connection failed");
}
}
void loop() {
// if there's incoming data from the net connection.
// send it out the serial port. This is for debugging
// purposes only:
while (client.available()) {
char c = client.read();
Serial.write(c);
}
// if ten seconds have passed since your last connection,
// then connect again and send data:
if (millis() - lastConnectionTime > postingInterval) {
httpRequest();
}
}
When I am on the router 2 (a simple hotspot router on a android phone) the code works.
When I am on the router 1 (a livebox supply by my internet provider), i have an IP address, i can see the ESP in the router (it's a web interface) but i can't get any result form the request (and i can't ping the module). The router don't route anything.
Of course the router have access to internet and from a computer connect to the router in wifi with the Curl command, the request work.
Have you some idea for me ?
try with these changes:
client.println("GET /latest.txt")
client.println( HTTP/1.1");
client.println("Host: www.arduino.cc");
client.println("User-Agent: ArduinoWiFi/1.1");
client.println("Connection: close");
client.println();
client.println("{\"on\":true}");