I have made a simple Node.js local server to receive POST requests from ESP32 and put it in a database. The server is working fine as I tested it using postman. The server is listening to port 127.0.0.1:3000. My problem is that client.connect(host, port) always returns false. I cannot connect to the client in order to make POST requests.
#include "Arduino.h"
#include "Arduino.h"
#include "WiFi.h"
WiFiClient client;
const IPAddress server(192,168,1,10);
const int httpPort = 3000;
const char* ssid = "******";
const char* password = "********";
void setup() {
Serial.begin(115200);
Serial.println();
Serial.println("Booted");
Serial.println("Connecting to Wi-Fi");
WiFi.begin (ssid, password);
WiFi.mode(WIFI_STA);
while (WiFi.status() != WL_CONNECTED) {
Serial.print(".");
delay(500);
yield();
}
Serial.println("WiFi connected");
if (client.connect(server,httpPort )) {
Serial.println("Client Connected");
} else {
Serial.println("No Connection");
}
void loop() {
}
The solution was to make the server listen to 0.0.0.0, which includes all IPv4 addresses on the server machine, instead of the loopback IP address 127.0.0.1
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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";
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)
Hello i am new to NodeMCU (ESP8266) i am building a small program to connect with WIFI (with internet) and if internet is not available i want to process request over IP address.
I am using firebase as a database / server to fetch the status. And process command through a URL like http://192.168.1.223/on?pin=04 if internet is connected then no problem i can update firebase entry, but with same network (LAN) connection over wifi i want to process i need to have static IP. But the concern is i am not able to make this IP address static, and if i make it static then my NodeMCU is not able to connect with firebase.
Here is how my code looks like:
#include <ESP8266WiFi.h>
#include <FirebaseArduino.h>
#include <ESP8266WebServer.h>
#define FIREBASE_HOST "pushst-56f2c.firebaseio.com"
#define FIREBASE_AUTH "mhBpzrNyhhwEGwmFxkVFTIEylwrXMw0gm"
#define PATH "/clients/devicename/watermotor"
IPAddress ip(192, 168, 1, 223); //Node static IP
IPAddress dns(192, 168, 1, 223);
IPAddress gateway(192,168,1,1);
IPAddress subnet(255,255,255,0);
char ssid[] = "MyNetwork";
char password[] = "Qwert98!!";
int wifiStatus = WL_IDLE_STATUS;
ESP8266WebServer server(80);
void setup() {
Serial.begin(115200);
delay(100);
Serial.println();
Serial.println();
Serial.print("Your are connecting to;");
Serial.println(ssid);
WiFi.begin(ssid, password);
WiFi.config(ip, dns, gateway, subnet);
while (WiFi.status() != WL_CONNECTED) {
digitalWrite(WIFI_CONNECT_LED, HIGH);
delay(500);
Serial.print(".");
}
wifiStatus = WiFi.status();
if(wifiStatus == WL_CONNECTED){
digitalWrite(WIFI_CONNECT_LED, LOW);
Serial.println("Your IP address is: ");
Serial.println(WiFi.localIP());
Firebase.begin(FIREBASE_HOST, FIREBASE_AUTH);
Firebase.set("/clients/devicename/watermotor/name", "Motor");
Firebase.set("/clients/devicename/watermotor/relay_status", "off");
Firebase.set("/clients/devicename/watermotor/device_status", "online");
Firebase.stream(PATH);
server.on("/on", handleOnRequest); //Associate the handler function
server.on("/off", handleOffRequest); //Associate the handler function
server.begin(); //Start the server
}
else{
Serial.println("");
Serial.println("WiFi not connected");
}
}
void loop() {
server.handleClient();
if (Firebase.failed()) {
Serial.println("streaming error");
Serial.println(Firebase.error());
delay(1000);
return;
}
if (Firebase.available()) {
Serial.println();
Serial.print("Firebase available");
Serial.println();
FirebaseObject event = Firebase.readEvent();
}
}
I am not sure if its there is some problem with FirebaseLibrary or its just the ESP8266!
Any suggestions will be helpful, thanks in advance! :)
You have wrong DNS server IP address. In your sketch it is the same as the static IP address you assign to esp. Then the name of the firebase host can't be resolved by DNS.
The DNS server is usually the router/gateway.
IPAddress dns(192,168,1,1)
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
The problem is that I want to execute the code below, but when ESP8266 is shut down, then I start it again, everything is gone.
So, is there a solution that I can make this ESP8266 work the same controlled by my Arduino Uno.
My program blow is to control the GPIO2 through web browser.
Thanks a lot to all of you!!
My Codes:
#include <ESP8266WiFi.h>
#include <aREST.h>
// Create aREST instance
aREST rest = aREST();
// WiFi parameters
const char* ssid = "Protect Big Dragon 4";
const char* password = "18717772056";
// The port to listen for incoming TCP connections
#define LISTEN_PORT 80
// Create an instance of the server
WiFiServer server(LISTEN_PORT);
void setup(void)
{
// Start Serial
Serial.begin(115200);
// Give name and ID to device
rest.set_id("2");
rest.set_name("lamp_control");
// Connect to WiFi
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() {
// Handle REST calls
WiFiClient client = server.available();
if (!client) {
return;
}
while(!client.available()){
delay(1);
}
rest.handle(client);
}
So your ESP8266 loses your code when it is rebooted.
Sounds like the memory is faulty.
Try a different ESP8266 and let us know what occurs.