Questions tagged [web-server]

A web-server is a system which delivers data such as web-pages to a client system.

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How to send data to a local server using Arduino Uno and ESP-01 8266?

I'm using an Arduino Uno to sample data from an MPU6050 and flex sensors at about 50 samples per second. I want to be able to send live data to a local web server which will then handle that data and ...
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ESP8266 HTTPClient GET Error -11 Read Timeout

I'm trying to send a data to an xampp server but I always get read timeout error. It works just fine if I access the web from browser. #include <ESP8266WiFi.h> #include <SoftwareSerial.h> #...
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ESP32 http_parser.h error 'HTTP_PATCH' conflicts with a previous declaration

#include <Arduino.h> #include <WiFi.h> #include <AsyncTCP.h> #include <HTTPClient.h> #include <ESPAsyncWebServer.h> #include <DallasTemperature.h> #include <...
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Arduino Mega 2560+Ethernet, Webserver: corrupt output of strings

I want to display data from an device in a micro webserver on the arduino. The first http request (/) from the Browser is correctly sent. This page contains a iframe, which loads path /status from the ...
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Why does the data I send to the server get rounded off and how do I send the entire float instead?

#include <Arduino.h> #include <WiFi.h> #include "WiFiManager.H" #include <HTTPClient.H> #include "ESPAsyncWebServer.h" #include <AsyncTCP.h> float version =...
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2 answers
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ESP32 AsyncWebServer with softAP does not serve pages

I'm trying to create a AsyncWebServer after enabling the SoftAP: #include <Arduino.h> #include <SPIFFS.h> #include <WiFi.h> #include <WiFiAP.h> #include <AsyncTCP.h> #...
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Generalize webserver routing

I'm following the examples for ESP32: AsyncWebServer _server(80); _server.on("/", HTTP_GET, [](AsyncWebServerRequest *request) { request->send(SPIFFS, "/index.html", ...
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  • 287
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Use of ESPAsyncWebServer.h with ArduinoJson version 6 for Master-Client transactions

I want to communicate two (2) ESP32's via Json commands using ESPAsyncWeb.h. The master should have specific operations to execute and respond to the client, and the client should be able to send ...
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2 votes
1 answer
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How can I do web hosting having all the code of the site stored in a sd?

I am carrying out this project in which the arduino acts as web server and hosts a website in which I show the constantly updated temperature of a laboratory. The problem is running all this code in ...
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3 answers
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Why is the server.on() function from "ESPAsyncWebServer.h" executed in the setup() side and not on the loop() side?

I'm implementing an example in which 2 ESP32's communicate each other using the HTTP Protocol. One acts as Server the other as Client. In the examples provided, I am curious about the declaration on ...
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Using both FastLED and Webserver without glitches possible?

I'm using an ESP8266 to control a short strip of WS2812 LEDs. I also want some way of remote Control so I'm looking into using a Web UI with the ESPAsyncWebServer library. However using that Webserver ...
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ESP8266 ESPAsyncWebServer LittleFS crashes

I am trying to write a simple web page to be served from my ESP8266 based on this tutorial: https://www.mischianti.org/2020/10/26/web-server-with-esp8266-and-esp32-byte-array-gzipped-pages-and-spiffs-...
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1 answer
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ESP32 Access Point using ESPAsyncWebServer, how to send multiple parameters between submenu and main (index) menu while still retaining page layout? [duplicate]

I am trying to figure out how to get requests (or whatever they are called) to display in the serial monitor, yet not change the HTML page bodies. The user selects their choices in the submenu (...
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1 answer
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ESP32 Access Point and HTTP Web Server, how to send multiple parameters?

I made this minimal example in order to figure out how to get requests (or whatever they are called) to display in the serial monitor. However, none of the query parameters (in the URL) can be seen in ...
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1 answer
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Problems connecting to WiFi101 access point

I currently have two Arduino Zero boards (using the SAMD21 microcontroller), each with an ATWINC1500 wifi module attached. I have established one of these units as a wifi access point with a server ...
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5 answers
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How to make better looking webpages on an Arduino webserver?

I have a Teensy 4.1 with ethernet, but I have other networked MCUs like a D1 mini, various ESP8266s and Arduino ethernet shields. My question is: how I can make better looking web pages on these ...
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How to fix this problem of invalid conversion from 'const char*' to 'char' [-fpermissive] [closed]

Im working with node mcu ESP 8266 and trying to make it a webserver but keep encountering this problem. #include<ESP8266WiFi.h> WiFiClient client; WiFiServer server(80); void ...
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1 answer
138 views

ESP32 AP Automatic Web Page

I've often encountered WiFi networks that require you to sign in through a web page that automatically opens after connecting to the access point, such as hotels. I'd like to implement something ...
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Why when I try to connect my ESP8266 to my node sever in my localhost it keep getting disconnect and connect?

I think the issue is within the library because I have try to implement this code according to the tutorial that I found in YouTube Youtube. The discussion of this tutorial is the first they implement ...
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158 views

ESP8266 Webserver does not respond

I am trying to reach the webserver running in my Wemos D1 Mini compatible board. I am trying one esp8266 example using Arduino examples "WifiManualServer" code below. I have replaced the SSI ...
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112 views

NodeMCU server stops responding after a while

I'm new to NodeMCU and ESP. I've created a basic web server on my NodeMCU. The server works fine for the first few minutes after resetting the board or re-uploading code. But after about half an hour, ...
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1 vote
0 answers
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Sending data to server

I have an SD card have a very big file (1M character). i try to load it into memory in terms of 4K character array ( The maximum I could do using Arduino Mega). but this take almost 250 call to the ...
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Http Client requests

I am working on a project where the ESP 8266 sends a very long string about 3000 chas over http as client. Likewise sensor data are determined. The loop repeats itself every 250ms. Now I noticed that ...
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1 vote
1 answer
56 views

Ethernet Shield not connecting

I've mounted an Ethernet Shield on top of an Arduino UNO. The Arduino is connected via usb to my pc and to the network via ethernet through a switch. I'm running a simplified verison of the WebServer ...
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2 votes
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238 views

Controlling Offline ESP8266 from secure website

I want to control my ESP8266 device from my secure website via 2 different ways: if ESP8266 is connected to internet, commands between website and device will sent over MQTT which as working ...
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How to avoid MQTT reconnect Loop

I have the following code designed to allow me to control my device from my website using mqtt broker while internet is available. I also built in a local webserver to control the device in case of ...
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2 votes
0 answers
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Where to define web server callback functions so they can access server object? (ESP8266WebServer library)

I want my ESP8266-based device to create an accesspoint that allows the user to input their home ssid and password. There is a device object that holds most of the data defined elsewhere. I'm trying ...
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2 votes
1 answer
153 views

How do I get an HTTP_POST response?

I have a function for HTTP_POST responses but it is never called when I post to it. I get the webpage instead. I call on it with server.on("/",HTTP_POST,response); But I only get the url in ...
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  • 201
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1 answer
253 views

How to access GPS location without internet

I need to provide a basic geolocation service for my clients. I built a location service based on the phone geolocation. It works great, not a problem. My problem is that some of my clients don't have ...
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1 answer
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HTTP_GET not clarified in scope

I'm trying to do an async webserver with access point using an ESP32. It's a little bit of a mix between This tutorial for AP and async and this tutorial since it's also with an async webserver and it ...
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1 vote
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Peculiar relay behavior from POST

I am trying to toggle on/off between two separate HTTP request. One submit button to turn it on, and another separate submit button to turn it off. I expect the device to launch in the off/low 0V ...
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  • 201
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0 answers
119 views

Help with ESP32-CAM "AI THINKER" module

I'm trying to make a RC car (with a surveillance camera if possible, using the web-cam code that comes with the ESP library) using a ESP-32 CAM as a wifi module to control the car using my computer. ...
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1 vote
0 answers
506 views

incompatible types in assignment of 'const String' to 'char [32] using server.arg

I am trying to create a class and getting getting the error incompatible types in assignment of 'const String' to 'char [32] when I declare char inString[32]; and try to set it as inString = server....
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  • 201
1 vote
1 answer
532 views

ESP8266 SocketIOclient constant disconnect with Python WebServerSocket

I am writing a program that echos back the message sent to the web socket server on a host machine. When running the ESP module, the connection is established but immediately disconnects as seen in ...
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0 votes
1 answer
41 views

How do I make two (or more) pins available on my server url?

I have a webserver configured on my esp8266 with is set to fire off electrical relay0 on my 8 port relay board. The device initializes relay0 perfectly and without errors. But when I configure the ...
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  • 201
0 votes
1 answer
103 views

Connecting Web Server in GoDaddy Hosting

I have a domain. It is hosted by GoDaddy. I need to connect that server and receive some data by executing PHP files. I am not sure about the components. Tutorials on internet describes how to control ...
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0 votes
1 answer
151 views

Is there a way to send a String via a Webserver Textbox without the use of the SD card?

Since my last post, I've been trying to do some extra things with my Stranger Things Wall Project. I connected a LCD Screen (16x2) that will take any text being processed to the wall and show what is ...
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3 votes
0 answers
343 views

ESP32 HTTP Server request interrupts Telnet session

I have an ESP32 application that uses a web server as a user interface. For auditing and debugging during development I use Serial; however, that is impractical in the installed system. So, I decided ...
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1 vote
1 answer
3k views

Why we are using client.flush() in the program code ,when we connect Esp8266 with internet or web server?

I am using Esp8266 Wifi modular (12-E) for controlling a led through the access of wifi/webserver. I have written code in Arduino ide taking various references from the google.In the code, I didn't ...
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-2 votes
1 answer
114 views

Most Efficient & Cost Effective Home Automation Setup

I managed to build a system using Wemos D1 R1 connected to my website to retrieve data to power on or off a 5V relay. Now I would like to expand the project to control all my house outlet. Assuming I ...
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2 votes
1 answer
270 views

Run function concurrent to server.available()

I have a Arduino UNO WiFi Rev2 board that runs WiFiServer serving as a web server. The server listens and accepts clients using server.available(). I also want a loop that controls a servo in ...
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  • 123
1 vote
2 answers
3k views

Controling 5V relay with Wemos D1 R1

I would like to control a 5V relay with Wemos D1 R1 module through webserver. I'm using the following modules: Tongling 5vdc Relay Wemos D1 R1 I'm using the following schematic: and here is the ...
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1 vote
0 answers
2k views

TCP client readStringUntil only when data exists

I have the attached script that reads data from a socket server (it is PHP at the server end). My problem (I think) is that the readStringUntil() needs a test above it, so that it "reads up to \r&...
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  • 242
2 votes
1 answer
1k views

How to Set RTC in ES32 using NTP server?

I am working on ESP32 And want to set RTC from the NTP server. How can I get epoch value I have done this thing on CC3200 launchpad and used an NTP server library to obtain epoch value.
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2 votes
1 answer
124 views

Latency in Websocket

I am using Websocket, for a communication from my mobile phone to a NodeMCU, and transmitting 4 channel, data, through 4 different Websocket Ports. the NodeMCU control code is here: // ============ By ...
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1 vote
1 answer
137 views

3 input (on/off/off with delay) to control 1device using ESP8266 as Web Server

I want to control one device in three ways : turn on / turn off / turn off with delay. To do that i use an ESP8266 web server + android phone app. The problem is that turn off with delay wont work. It ...
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1 vote
0 answers
45 views

how to set up an ESP8266 as a webserver

I would like to set up an esp8266, connected arduino as a webserver, specifically, one that has its own IP, and is stand alone, not connected to other networks, and offers its sensor info as the ...
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  • 858
0 votes
1 answer
121 views

ESP32 Cannot assign value to string. Getting wrong value

Hello I have problems with strings in my sketch. I assingn values to my string (for example tempStrReturn) in the functions setNr1, setNr2. If i pass the value 1 to the function i get "" or "...
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  • 15
0 votes
1 answer
235 views

How to connect multiple NodeMCUs and 1 PC over wifi and have PC control NodeMCUs? [duplicate]

I am trying to design a laser tag system using multiple NodeMCUs in the guns. I am trying to figure out how to connect and control them over WiFi. I also need a computer connected that will control ...
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2 votes
1 answer
185 views

Securing ESP8266 connections

In my setup, I've got a number of ESP8266 devices around my home controlling various devices like my boiler and some lights. They're all controlled by a central smart hub on a Raspberry Pi with a ...
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