I am new to Arduino and I am not so familiar with it. I am not sure why the client cannot connect to the server and I have been looking at it for hours. Any solution to this would be a great help.
So I successfully establish a server with the code below. But...
// server.ino
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
const char* ssid = "WifiName"; // Wifie name
const char* password = "WifiPassword"; // Wifi password
float sensor_value = 0.0;
String Website;
ESP8266WebServer server(80);
void setup(){
Serial.begin(115200);
WiFi.mode(WIFI_AP);
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while(WiFi.status()!=WL_CONNECTED){
Serial.print(".");
delay(500);
}
Serial.println("Server started at port 80.");
Serial.println("WiFi connected.");
Serial.println("IP address: ");
Serial.print("URL=http://");
Serial.println(WiFi.localIP());
server.on("/", handleIndex); //use the top root path report last sensor value
server.on("/update",handleUpdate); // use this route to update sensor value
server.begin();
}
void loop(){
server.handleClient();
}
void handleIndex(){
Website = "<html><body onload ='process()'><div id='div1'>"+ String(sensor_value) +"</div></body></html>";
server.send(200," text/html",Website);
}
void handleUpdate(){
sensor_value = server.arg("value").toFloat();
Serial.println(sensor_value);
server.send(200,"text/plain","Updated");
}
I try to connect a client to the server so it could send data to the server, but a connection between the client and the server cannot be established and I don't know why. I check the IP address and it is all correct I just don't get why the client fails to connect to the server
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
#include <HX711.h>
#include "Wire.h"
#define DOUT D5
#define CLK D6
HX711 scale;
const char* ssid = "WifiName";
const char* password = "Wifipassowrd";
float calibration_factor = 107095;
float val_Weight;
const char* host = "192.168.0.167"; // Server host IP.
const int port = 80;
WiFiClient client;
void setup() {
Serial.begin(115200); //set baud rate
Serial.println("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED)
{
delay(500);//millisecond
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected & connect to client");
}
void loop() {
//connect to the server and send the data as URL parameter
if(client.connect(host, port)){
String url = "update?value=";
url+=String(25.0);
client.print(String("GET /") + url + "HTTP/1.1\r\n" + "Host: " + host + "\r\n" +
"Connection: close\r\n\r\n");
delay(10);
Serial.println("Response: ");
while(client.available()){
String line = client.readStringUntil('\r');
Serial.print(line);
}
}else{
Serial.println("fail");
}
}
Any help would be great thanks!!!
Check the passwords, you have a typo.
const char* password = "Wifipassowrd";
Related
Goal
I am trying to send temperature data between two Esp8266 modules.
The Server reads a temperature value from the analog pin and is supposed to host this data on a website (I don´t know the correct term for that) over a wifi access point that also runs on the Esp. The Client is supposed to receive the temperature value and output it via serial.
What works
I can connect my phone to the access point and access the data on the IP of the access point. I also can connect the client Esp to my home wifi and it outputs code from different websites.
Problem
But when I try to connect it to the Esp wifi, the wifi login/connection works, but the http.GET function outputs -1 which corresponds to the error message "HTTPC_ERROR_CONNECTION_FAILED".
While the client is connected to the wifi of the Esp my phone displays a similar error message.
I also had the problem that the esp could not continually read A0 while using the Wifi, so I had to build in a delay.
Server Code
// Import required libraries
#include "ESPAsyncWebServer.h"
#include "WiFi.h"
#include <math.h>
#include <ESP8266WiFi.h>
//Constants for temperature calculation
double T;
float V_0 = 5.02;
float R_1 = 99700.0;
float a = 283786.2;
float b = 0.06593;
float c = 49886.0;
float set = 30;
int sensorValue;
float voltage;
// Set your access point network credentials
const char* ssid = "ESP32-Access-Point";
const char* password = "123456789";
// Create AsyncWebServer object on port 80
AsyncWebServer server(80);
String readTemp() {
return String((-1.0/b)*(log(((R_1*voltage)/(a*(V_0-voltage)))-(c/a)))); //Function to calculate temperature from Voltage
}
void setup(){
Serial.begin(115200);
Serial.println();
// Setting the ESP as an access point
Serial.print("Setting AP (Access Point)…");
// Remove the password parameter, if you want the AP (Access Point) to be open
WiFi.softAP(ssid, password);
IPAddress IP = WiFi.softAPIP();
Serial.print("AP IP address: ");
Serial.println(IP);
server.on("/temperature", HTTP_GET, [](AsyncWebServerRequest *request){
request->send_P(200, "text/plain", readTemp().c_str());
});
// Start server
server.begin();
}
void loop()
{
//reading of A0
Serial.println(voltage);
Serial.println(readTemp().c_str());
sensorValue = analogRead(0); //?Wifi not working, when reading A0?
delay(10);
voltage = sensorValue * (3.3 / 1023.0);
}
Client Code
#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <WiFiClient.h>
#include <ESP8266WiFiMulti.h>
ESP8266WiFiMulti WiFiMulti;
const char* ssid = "ESP32-Access-Point";
const char* password = "123456789";
void setup () {
Serial.begin(115200);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.println("Connecting..");
}
Serial.print("Connected to ");
Serial.println(ssid);
}
void loop() {
if (WiFi.status() == WL_CONNECTED) { //Check WiFi connection status
HTTPClient http; //Declare an object of class HTTPClient
http.begin("http://192.168.4.1/temperature"); //Specify request destination
int httpCode = http.GET(); //Send the request
if (httpCode > 0) { //Check the returning code
String payload = http.getString(); //Get the request response payload
Serial.println("/////////////////////////////////////////////////////////////");
Serial.println(payload); //Print the response payload
}
else{Serial.println("Error");}
http.end(); //Close connection
}
delay(30000); //Send a request every 30 seconds
}
I would really appreciate it if anybody could help me with this because I have been tearing my hair out for weeks over this. Thanks in advance and sorry for any grammatical or spelling mistakes in advance.
I tried to Run this code but the connection fails and HTTPCode returns -1 , I'm using WIFI manager and it works sucessfully connected to the network
the link is worked successfully on POSTman and data posted in Database
Hi All, I tried to Run this code but the connection fails and HTTPCode returns -1 , I'm using WIFI manager and it works sucessfully connected to the network
the link is worked successfully on POSTman and data posted in Database
#include <OneWire.h>
#include <DallasTemperature.h>
#include <ESP8266WiFi.h>
#include <WiFiManager.h>
#include <ESP8266HTTPClient.h>
#include <Wire.h>
IPAddress staticIP750_100(192,168,1,16);
IPAddress gateway750_100(192,168,1,1);
IPAddress subnet750_100(255,255,255,0);
HTTPClient http;
#define ONE_WIRE_BUS 2 // DS18B20 on NodeMCU pin D4
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature DS18B20(&oneWire);
float temp_0;
const char* host = "http://mysite2020.info";
void setup()
{
Serial.begin(115200);
WiFiManager wifimanger ;
DS18B20.begin();
Wire.begin(D2, D1)
readTemp();
WiFi.mode(WIFI_STA);
wifimanger.autoConnect("Inlet Device","12345");
while ((!(WiFi.status() == WL_CONNECTED))){
delay(300);
Serial.println("...");
}
Serial.println("WiFi connected");
WiFi.config(staticIP750_100, gateway750_100, subnet750_100);
WiFi.hostname("Inlet Device") ;
delay(3000);
Serial.println("Welcome To Device No : 1");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
Serial.println("Your Gateway is : ");
Serial.println((WiFi.gatewayIP().toString().c_str()));
Serial.println("Your Hostname is : ");
Serial.println((WiFi.hostname()));
delay(3000);
Serial.println("Welcome to my Project!");
delay(3000);
}
void loop() {
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;
}
Serial.print("Requesting URL: ");
sendtemp ();
}
void sendtemp ()
{
temp_0=23.26;
String url = "http://mysite2020.info/Api/insert_mssqlserver.php?Reading=" + String(temp_0);
Serial.println(url);
http.begin(url);
http.addHeader("Content-Type", "application/x-www-form-urlencoded");
auto httpCode = http.GET();
Serial.println(httpCode); //Print HTTP return code
String payload = http.getString();
Serial.println(payload); //Print request response payload
http.end(); //Close connection Serial.println();
Serial.println("closing connection");
delay(500);
}
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";
I have 2 ESP32 boards, and I want to make them server/client in Arduino IDE. Just two boards, no router in between.
So far I have followed tutorials, and I have been able to connect to the ESP32 from my phone.
#include <WiFi.h>
WiFiServer server;
const char *ssid = "Zupa";
const char *password = "12345678";
void setup() {
Serial.begin(115200);
Serial.println();
Serial.print("Configuring access point...");
WiFi.softAP(ssid, password);
IPAddress myIP = WiFi.softAPIP();
Serial.print("AP IP address: ");
Serial.println(myIP);
}
void loop() {
}
However, I cannot connect from other ESP32. Code as follows:
#include <WiFi.h>
#include <WiFiMulti.h>
WiFiMulti WiFiMulti;
void setup()
{
Serial.begin(115200);
delay(10);
enter code here
// We start by connecting to a WiFi network
WiFiMulti.addAP("Zupa", "12345678");
Serial.println();
Serial.println();
Serial.print("Wait for WiFi... ");
while(WiFiMulti.run() != WL_CONNECTED) {
Serial.print(".");
delay(500);
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
delay(500);
}
void loop()
{
const uint16_t port = 80;
const char * host = "192.168.1.4"; // ip
Serial.print("connecting to ");
Serial.println(host);
// Use WiFiClient class to create TCP connections
WiFiClient client;
if (!client.connect(host, port)) {
Serial.println("connection failed");
Serial.println("wait 5 sec...");
delay(5000);
return;
}
// This will send the request to the server
client.print("Send this data to server");
//read back one line from server
String line = client.readStringUntil('\r');
client.println(line);
Serial.println("closing connection");
client.stop();
Serial.println("wait 5 sec...");
delay(5000);
}
What happens is it just says it cannot connect. The IP address is default, and I double checked it on the server side! How come I can connect from phone and not from ESP32?
Furthermore, how would I communicate between the two? I tried reading online, but everyone seems to do phone to ESP communication, not ESP to ESP. I also tried reading Mr. Kolbans book on ESP32, but with no success. I am quite new at this, and feel stuck.
All I had to change was the WiFi library from the ESP8266wifi.h to the Wifi.h which is compatible with ESP32.
(Source)
From the code examples is just a matter of changing the code to fit your specific needs.
#include <WiFi.h>
#include <WiFiClient.h>
void setup()
{
Serial.begin(115200);
delay(10);
// We start by connecting to a WiFi network
WiFi.mode(WIFI_STA); //Set wifi mode as station
WiFi.begin("Zupa", "12345678");//Connect to other ESP32
Serial.println();
Serial.println();
Serial.print("Wait for WiFi... ");
//Wait for WiFi to connect
while(WiFi.waitForConnectResult() != WL_CONNECTED){
Serial.print(".");
delay(1000);
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
delay(500);
}
void loop()
{
const uint16_t port = 80;
const char * host = "192.168.1.4"; // ip
Serial.print("connecting to ");
Serial.println(host);
// Use WiFiClient class to create TCP connections
WiFiClient client;
if (!client.connect(host, port)) {
Serial.println("connection failed");
Serial.println("wait 5 sec...");
delay(5000);
return;
}
// This will send the request to the server
client.print("Send this data to server");
//read back one line from server
String line = client.readStringUntil('\r');
client.println(line);
Serial.println("closing connection");
client.stop();
Serial.println("wait 5 sec...");
delay(5000);
}
Try change the IP of client code to:
const char * host = "192.168.4.1"
Tip: I use the Finger app in Android or iOS to scan the network,
its very good to see the IP of each device connected.
(In your case, You need connect the mobile device into your Esp32's hot spot before use the Finger)
Hi I am new to arduino programming and I am have an issue. I have successfully managed to display the wifi using esp8266 module i.e when I run my code the esp8266 module creates a wifi. It also asks for password but after that there is no output of successful connection. I am using the method wifi.softAp(username,password) for creation of wifi network. I have written the following code:
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
const char* ssid = "Jeet";//Wifi username
const char* password = "wifibin12"; //Wifi password
ESP8266WebServer server(80);
void handleRoot() {
server.send(200, "text/plain", "<h1>hello from esp8266!</h1>");
}
void setup(void) {
// put your setup code here, to run once:
Serial.begin(115200);
//WiFi.mode(WIFI_AP);
Serial.print("this is my pass");
Serial.print(password);
WiFi.softAP(ssid, password);
Serial.print("Setting soft-Ap ... ");
// Wait for connection
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
//If connection successful show IP address in serial monitor
Serial.println("");
Serial.print("Connected to ");
Serial.println(ssid);
Serial.print("IP address: ");
Serial.println(WiFi.localIP()); //IP address assigned to your ESP
server.on("/", handleRoot); //Which routine to handle at root location
server.begin(); //Start server
Serial.println("HTTP server started");
}
void loop() {
// put your main code here, to run repeatedly:
server.handleClient();
}
When I run the code I get ............. output continuously on serial monitor. Kindly help me fix this issue if anyone knows what I am doing wrong. Suggestions would also be appreciated.
It's getting stuck to while loop. Wifi.status() returns WL_CONNECTED when it is connected to wifi network (to another Access Point). So if you want just get AP to work you should try this:
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
const char* ssid = "Jeet"; //Wifi username
const char* password = "wifibin12"; //Wifi password
ESP8266WebServer server(80);
void handleRoot() {
server.send(200, "text/plain", "<h1>hello from esp8266!</h1>");
}
void setup(void) {
// put your setup code here, to run once:
Serial.begin(115200);
Serial.print("this is my pass");
Serial.print(password);
WiFi.softAP(ssid, password);
Serial.print("Setting soft-Ap ... ");
// Wait for connection
//If connection successful show IP address in serial monitor
Serial.println("");
Serial.print("AP name ");
Serial.println(ssid);
Serial.print("IP address: ");
Serial.println(WiFi.localIP()); //IP address assigned to your ESP
server.on("/", handleRoot); //Which routine to handle at root location
server.begin(); //Start server
Serial.println("HTTP server started");
}
void loop() {
// put your main code here, to run repeatedly:
server.handleClient();
}
And WiFi.localIP() doesn't return AP's local ip. Default is 192.168.4.1.
I recommend looking docs and examples from here: https://github.com/esp8266/Arduino/tree/master/doc/esp8266wifi