How to solve espwifi.h library - esp8266

#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

Related

LCD ESP8266WiFi access point Send Text

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 /

ESP8266 reading request from local database

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:

Arduino ESP8266 01 MQTT Raspberry pi

I want to use ESP 8266 01 and arduino uno as client in MQTT. The code For ESP8266 01 is successfully compiled and I'M getting errors in Arduino uno
The error is 'messageTemp' was not declared in this scope
Amd also I have a thought of using stm32xx in client.
If I compile for that
exit status 1
ISO C++ forbids comparison between pointer and integer [-fpermissive]
above is the error I'm getting
1)ESP code
// Loading the ESP8266WiFi library and the PubSubClient library
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
// Change the credentials below, so your ESP8266 connects to your router
const char* ssid = "YOUR_SSID";
const char* password = "YOUR_PASSWORD";
const char* mqtt_server = "YOUR_RPi_IP_Address";
// Initializes the espClient
WiFiClient espClient;
PubSubClient client(espClient);
void setup_wifi() {
delay(10);
// We start by connecting to a WiFi network
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.print("WiFi connected - ESP IP address: ");
Serial.println(WiFi.localIP());
}
if(topic=="home/office/esp1/gpio2"){
Serial.print("Changing GPIO 2 to ");
if(messageTemp == "1"){
// digitalWrite(ledGPIO2, HIGH);
Serial.print("On");
}
else if(messageTemp == "0"){
// digitalWrite(ledGPIO2, LOW);
Serial.print("Off");
}
}
Serial.println();
}
void reconnect() {
// Loop until we're reconnected
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
// Attempt to connect
if (client.connect("ESP8266Client")) {
Serial.println("connected");
client.subscribe("home/office/esp1/gpio2");
}
else
{
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}
void setup() {
Serial.begin(115200);
setup_wifi();
client.setServer(mqtt_server, 1883);
client.setCallback(callback);
}
void loop() {
if (!client.connected()) {
reconnect();
}
client.loop();
}
Code for Arduino UNO
void setup(){
Serial.begin(9600);
pinMode(12, OUTPUT);
digitalWrite(12, HIGH);
String messageTemp;
}
void callback(String topic, byte* message, unsigned int length) {
Serial.print("Message arrived on topic: ");
Serial.print(topic);
Serial.print(". Message: ");
String messageTemp;
for (int i = 0; i < length; i++) {
Serial.print((char)message[i]);
messageTemp += (char)message[i];
}
Serial.println();
}
void loop ()
{
if (Serial.available()){
char topic = Serial.read();
{
if (topic=="home/office/esp1/gpio2")
{
Serial.print("Changing GPIO 2 to ");
if(messageTemp == "1"){
digitalWrite(12, HIGH);
Serial.print("On");
}
else if(messageTemp == "0")
{
digitalWrite(12, LOW);
Serial.print("Off");
}
}}}}
ESP code doesn't look the whole source code you provided. In case of Arduino UNO, if you're intending to use messageTemp as a global variable, then you need to declare it only one time outside of functions. In the above code, you declared it twice in setup() and callback(), then those are considered as local variables. Even in loop(), there's no declaration, this should create the compile error.

GET request failed in Arduino-Uno

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");

ESP8266 code not working properly

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!

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