This is ESP8266 code to turn ON/OFF an LED. I'm using the Arduino IDE built-in example code. The LED is working properly but I want to send HTTP requests to my locally-hosted web site (which send emails) but it's not working.
Connected with my local Wifi
Assigned a static IP
When I hit 192.168.1.101/gpio/1(Led ON)
When I hit 192.168.1.101/gpio/0(Led OFF) It's working but unable to hit my web site.
When I hit 192.168.1.101/gpio/1 then it should hit my locally-hosted URL (192.168.1.100/home/ardchk)
Kindly help me to sort out this issue.
#include <ESP8266WiFi.h>
const char* ssid = "SMART";
const char* password = "123456789";
const char* host = "192.168.1.100"; // Your domain
IPAddress ip(192, 168, 1, 101); // where xx is the desired IP Address
IPAddress gateway(192, 168, 1, 1); // set gateway to match your network
IPAddress subnet(255, 255, 255, 0);
WiFiServer server(80);
void setup() {
Serial.begin(115200);
delay(10);
// prepare GPIO3
pinMode(3, OUTPUT);
digitalWrite(3, 0);
// Connect to WiFi network
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.config(ip,gateway,subnet);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
// Start the server
server.begin();
Serial.println("Server started");
// Print the IP address
Serial.println(WiFi.localIP());
}
void loop() {
// Check if a client has connected
WiFiClient client = server.available();
if (!client) {
return;
}
// Wait until the client sends some data
Serial.println("new client");
while(!client.available()) {
delay(1);
}
// Read the first line of the request
String req = client.readStringUntil('\r');
Serial.println(req);
// Match the request
int val;
if (req.indexOf("/gpio/0") != -1) {
val = 0;
if (client.connect(host, 80)) {
//starts client connection, checks for connection
Serial.println("connected to website/server");
client.println("GET /home/ardchk HTTP/1.1"); //Send data
client.println("Host: 192.168.1.100");
Serial.println("Email Sended");
client.println("Connection: close");
//close 1.1 persistent connection
client.println(); //end of get request
}
} else if (req.indexOf("/gpio/1") != -1) {
val = 1;
} else {
Serial.println("invalid request");
client.stop();
return;
}
// Set GPIO2 according to the request
digitalWrite(3, val);
client.flush();
// Prepare the response
String s = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n<!DOCTYPE HTML>\r\n<html>\r\nGPIO is now ";
s += (val)?"high":"low";
s += "</html>\n";
// Send the response to the client
client.print(s);
delay(1);
Serial.println("Client disconnected");
// The client will actually be disconnected
// when the function returns and 'client' object is destroyed
}
Based on your question/comment, I am assuming that client.connect(host, 80) is returning false.
I believe you are unable to connect to your host because your are trying to connect twice with the same client.
Your code looks like this:
// returns an already connected client, if available
WiFiClient client = server.available()
//...
if (client.connect(host, 80)) {/*...*/}
You see, you are using the already connected client to attempt to connect to your host. Instead, try creating a separate WiFiClient for that job:
WiFiClient requesting_client = server.available();
//...
if (req.indexOf("/gpio/0") != -1) {
val = 0;
// create a fresh, new client
WiFiClient emailing_client;
if (emailing_client.connect(host, 80)) {
// ...
// don't forget that you need to close this client as well!
emailing_client.stop();
}
Hope this helps!
Related
hello i am trying to send data to lcd screen
,but they arrive as GET/ DATO /HTTP 1.1
I ONLY NEED TO ARRIVE DATA AND DELETE (GET/ /HTTP 1.1)
I am used to the esp8266 by wifi in access point mode the program works well
request is the data that arrives at the arduino terminal
}
if (request.indexOf("") != -1) { //////SHIPPING PART
// enviar
lcd.init();
lcd.backlight();
lcd.setCursor(0,0);
lcd.print(request);
delay(1000);
}
Send Text
I just want to send text so this is what I hope to ahieve
SEND DATO
DELETE GET/ /HTTP 1.1
#include <ESP8266WiFi.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
const char *ssid_AP = "LCDAP";
const char *Password_AP = "12345678";
WiFiServer server(80);
LiquidCrystal_I2C lcd(0x27,2,16);
void setup(){
lcd.init(); // initialize the lcd
lcd.backlight();
lcd.setCursor(2,0);
lcd.print("LCD Ready");
Serial.begin(115200);
delay(10);
delay(1000);
WiFi.mode(WIFI_AP);
WiFi.softAP(ssid_AP,Password_AP);
Serial.println("WiFi conected");
Serial.println();
WiFi.printDiag(Serial);
Serial.print("AP direccion IP: ");
Serial.println(WiFi.softAPIP());
// Start the server
server.begin();
Serial.println("Server started");
}
void loop() {
// Check if a client has connected
WiFiClient client = server.available();
if (!client) {
return;
}
// Wait until the client sends some data
Serial.println("new client");
while(!client.available()){
delay(1);
}
// Read the first line of the\r %d\n
String request = client.readStringUntil('\n');
Serial.println(request);
client.flush();
if (request.indexOf("/LCDBORRAR") != -1) {
lcd.clear();
delay(1000);
}
if (request.indexOf("") != -1) { ////// send text
// enviar
lcd.init();
lcd.backlight();
lcd.setCursor(0,0);
lcd.print(request);
delay(1000);
}
delay(1);
Serial.println("Client disonnected");
Serial.println("");
}
req.replace(" HTTP/1.1", ""); // Para quitar HTTP/1.1
req.replace("GET /", ""); // Para quitar GET /
#include "WiFiEsp.h"
char ssid[] = "***"; // your network SSID (name)
char pass[] = "#"; // your network password
int status = WL_IDLE_STATUS; // the Wifi radio's statusb
char server[] = "apiv2.corona-live.com";
// Initialize the Ethernet client object
WiFiEspClient client;
void setup()
{
// initialize serial for debugging
Serial.begin(115200);
// initialize serial for ESP module
Serial1.begin(115200);
// initialize ESP module
WiFi.init(&Serial1);
// check for the presence of the shield
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
// don't continue
while (true);
}
// attempt to connect to WiFi network
while ( status != WL_CONNECTED) {
Serial.print("Attempting to connect to WPA SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network
status = WiFi.begin(ssid, pass);
}
// you're connected now, so print out the data
Serial.println("You're connected to the network");
printWifiStatus();
Serial.println();
Serial.println("Starting connection to server...");
// if you get a connection, report back via serial
if (client.connect(server, 80)) {
Serial.println("Connected to server");
// Make a HTTP request
client.println("GET /stats.json?timestamp=1634891368873 HTTP/1.1");
client.println("Host: apiv2.corona-live.com");
client.println("Connection: close");
client.println();
}
}
void loop()
{
delay(500);
// if there are incoming bytes available
// from the server, read them and print them
while(client.connected())
{
// There is a client connected. Is there anything to read?
while(client.available() > 0)
{
char c = client.read();
Serial.print(c);
}
Serial.println();
Serial.println("Waiting for more data...");
delay(100); // Have a bit of patience...
}
// if the server's disconnected, stop the client
if (!client.connected()) {
Serial.println();
Serial.println("Disconnecting from server...");
client.stop();
// do nothing forevermore
while (true);
}
}
void printWifiStatus()
{
// print the SSID of the network you're attached to
Serial.print("SSID: ");
Serial.println(WiFi.SSID());
// print your WiFi shield's IP address
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
// print the received signal strength
long rssi = WiFi.RSSI();
Serial.print("Signal strength (RSSI):");
Serial.print(rssi);
Serial.println(" dBm");
}
Result :
[WiFiEsp] Connecting to apiv2.corona-live.com
Connected to server
HTTP/1.1 301 Moved Permanently
D[WiFiEsp] TIMEOUT: 720
https://apiv2.corona-live.com/stats.json?timestamp=1634891368873 Can I get JSON data from these sites? If possible, I would like to know why this error occurred.
(I use arduino mega 2560 + esp8266/esp01 module
I was not to expert with Nodemcu or IOT. I'm trying to read data from database with request by Nodemcu; it works but it showing that I don't want to get.
This is the code:
#include <ESP8266WiFi.h>
const char* ssid = ".....";
const char* password = ".....";
const char* host = "......";
WiFiClient client;
const int httpPort = 8000;
String url;
unsigned long timeout;
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());
}
void loop() {
Serial.print("connecting to ");
Serial.println(host);
if (!client.connect(host, httpPort)) {
Serial.println("connection failed");
//return;
}
url = "/request/55";
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");
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 a;
a = client.readString();
Serial.println(a);
}
Serial.println();
Serial.println("closing connection");
Serial.println();
}
URL: /request/55 only echo value "12", I'm trying to use client.readString() and this the result :
It is work, but I just only want that value "12". How can I get it?
You're implementing the HTTP protocol yourself. That's why you're getting HTTP headers back. You don't need to do that and probably shouldn't.
Use the ESP8266HTTPClient library. It implements HTTP correctly so that you don't have to. You can find examples at https://github.com/esp8266/Arduino/tree/master/libraries/ESP8266HTTPClient/examples
I found how to get data from database, first you need to change the result from URL. In this condition I change result "12" to "data=12", then on Nodemcu:
while (client.available()) {
String a;
if (client.find("data=") {
a = client.parseInt(a);
Serial.println(a);
}
}
This is the result:
I am trying to access a simple web page running in my Rpi-server using ESP8266 and Arduino.
I have refereed this similar SO question , but it's not the solution for my problem.
Here is my current Arduino Code :
#include "WiFiEsp.h"
// Emulate Serial1 on pins 6/7 if not present
#ifndef HAVE_HWSERIAL1
#include "SoftwareSerial.h"
SoftwareSerial Serial1(2,3); // RX, TX
#endif
char ssid[] = "RPi"; // your network SSID (name)
char pass[] = "raspberry"; // your network password
int status = WL_IDLE_STATUS; // the Wifi radio's status
char server[] = "192.168.50.1";
// Initialize the Ethernet client object
WiFiEspClient client;
void setup()
{
// initialize serial for debugging
Serial.begin(9600);
// initialize serial for ESP module
Serial1.begin(9600);
// initialize ESP module
WiFi.init(&Serial1);
// check for the presence of the shield
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
// don't continue
while (true);
}
// attempt to connect to WiFi network
while ( status != WL_CONNECTED) {
Serial.print("Attempting to connect to WPA SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network
status = WiFi.begin(ssid, pass);
}
// you're connected now, so print out the data
Serial.println("You're connected to the network");
printWifiStatus();
Serial.println();
Serial.println("Starting connection to server...");
// if you get a connection, report back via serial
if (client.connect(server, 80)) {
Serial.println("Connected to server");
// Make a HTTP request
client.println("GET /simple.html HTTP/1.1");
client.println("Host: 192.168.50.1");
client.println("Connection: close");
client.println();
}
}
void loop()
{
while (client.available()) {
char c = client.read();
Serial.write(c);
}
// if the server's disconnected, stop the client
if (!client.connected()) {
Serial.println();
Serial.println("Disconnecting from server...");
client.stop();
// do nothing forevermore
while (true);
}
void printWifiStatus()
{
// print the SSID of the network you're attached to
Serial.print("SSID: ");
Serial.println(WiFi.SSID());
// print your WiFi shield's IP address
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
// print the received signal strength
long rssi = WiFi.RSSI();
Serial.print("Signal strength (RSSI):");
Serial.print(rssi);
Serial.println(" dBm");
}
Output:
Starting connection to server...
[WiFiEsp] Connecting to 192.168.50.1
Connected to server
[WiFiEsp] Data packet send error (2)
[WiFiEsp] Failed to write to socket 3
[WiFiEsp] Disconnecting 3
My simple.html looks like this.
<html>
<body>
<p>1</p>
</body>
</html>
}
I accessed to this page from web browser and it shows the content properly.
What is missing here?
Thanks in advance.
Try this line in your code
client.print("GET /simple.html HTTP/1.0\r\n\r\n");
I am trying to make a wireless light control device (on/off/dimming) using an Arduino, an Android app, and a router.
I am setting the Arduino to a static IP 192.168.1.2 using the router. I am sending strings ("1"-off, "2"-decrease brightness, "3"-increase brightness, "4"-on) from the Android app to the IP address 192.168.1.2. I have connected the Arduino to the Internet using the Arduino Wi-Fi shield and set up the WifiServer using the following code:
char ssid[] = "NAME"; // Your network SSID (name)
char pass[] = "PASS"; // Your network password (use for WPA, or use as key for WEP)
int keyIndex = 0; // Your network key Index number (needed only for WEP)
int status = WL_IDLE_STATUS;
WiFiServer server(23);
boolean alreadyConnected = false; // Whether or not the client was connected previously.
void setup() {
// Start serial port:
Serial.begin(9600);
// Attempt to connect to Wi-Fi network:
while ( status != WL_CONNECTED) {
Serial.print("Attempting to connect to SSID: ");
Serial.println(ssid);
status = WiFi.begin(ssid, pass);
// Wait 10 seconds for connection:
delay(10000);
}
// Start the server:
server.begin();
// You're connected now, so print out the status:
printWifiStatus();
}
The main problem I am having is how to accept and print out the strings from the Android device. The current code I have to do this is:
// Listen for incoming clients
WiFiClient client = server.available();
if (client) {
// An HTTP request ends with a blank line
boolean newLine = true;
String line = "";
while (client.connected() && client.available()) {
char c = client.read();
Serial.print(c);
// If you've gotten to the end of the line (received a newline
// character) and the line is blank, the HTTP request has ended,
// so you can send a reply.
if (c == '\n' && newLine) {
// Send a standard HTTP response header
//client.println("HTTP/1.1 200 OK");
//client.println("Content-Type: text/html");
//client.println();
}
if (c == '\n') {
// You're starting a new line
newLine = true;
Serial.println(line);
line = "";
}
else if (c != '\r') {
// You've gotten a character on the current line
newLine = false;
line += c;
}
}
Serial.println(line);
// Give the web browser time to receive the data
delay(1);
// Close the connection:
//client.stop();
}
}
I am basing this code off of the blog post Android Arduino Switch with a TinyWebDB hack, but this code is for an Ethernet shield. The Android app was made using the MIT App Inventor, which is similar to the one found the blog post.
TLDR, how can I get the strings using the Arduino Wi-Fi shield?
You can read the characters into a full string instead of reading each individual character into the serial monitor as in your example above.
In your example, this bit of code would read each character from the client TCP session and print it to the serial monitor, thus displaying the HTTP requests in the serial console.
char c = client.read();
Serial.print(c);
Try something like this instead. Declare a string named "readString" before your setup() function in the Arduino sketch like this:
String readString;
void setup() {
//setup code
}
void loop() {
// Try this when you're reading inside the while client.connected loop instead of the above:
if (readString.length() < 100) {
readString += c;
Serial.print(c);
}
Here is a working example of the loop():
void loop() {
// Listen for incoming clients
WiFiClient client = server.available();
if (client) {
Serial.println("new client");
// An HTTP request ends with a blank line
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) {
char c = client.read();
//Serial.write(c);
// If you've gotten to the end of the line (received a newline
// character) and the line is blank, the HTTP request has ended,
// so you can send a reply.
if (readString.length() < 100) {
readString += c;
Serial.print(c);
}
if (c == '\n' && currentLineIsBlank) {
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("Connnection: close");
client.println();
client.println("<!DOCTYPE HTML>");
//send the HTML stuff
client.println("<html><head><title>Admin Web</title><style type=\"text/css\">");
client.println("body { font-family: sans-serif }");
client.println("h1 { font-size: 14pt; }");
client.println("p { font-size: 10pt; }");
client.println("a { color: #2020FF; }");
client.println("</style>");
client.println("</head><body text=\"#A0A0A0\" bgcolor=\"#080808\">");
client.println("<h1>Arduino Control Panel</h1><br/>");
client.println("<form method=\"link\" action=\"/unlockdoor\"><input type=\"submit\" value=\"Unlock Door!\"></form>");
client.println("<br/>");
client.println("</body></html>");
break;
}
if (c == '\n') {
// You're starting a new line.
currentLineIsBlank = true;
}
else if (c != '\r') {
// You've gotten a character on the current line.
currentLineIsBlank = false;
}
}
}
// Give the web browser time to receive the data.
delay(1);
// Close the connection:
client.stop();
Serial.println("client disonnected");
if (readString.indexOf("/unlockdoor") > 0)
{
unlockdoor();
Serial.println("Unlocked the door!");
}
readString = "";
}