How do you get simple data from Local web server created by esp8266?

Jon_Coop · December 28, 2019, 6:22am

I've looked high and low and worded my searches every way possible and cannot figure out how to get / read data from a local web server that was created by an Arduino ESP8266. The web server is super simple and only displays two lines of text. I just want to be able to read one of those lines and display it in the app.

If you could just point me towards a tutorial on getting the information from my local web server that would be awesome.

Everything I keep finding is for HTTP related or msq etc... I don't want to write anything to the webserver all I want to do is read one line of text.!

Here is the Arduino sketch used to create the local web server -

/*****************************************************

Date: 18 june 2018

Written by: Usman Ali Butt

Property off: microcontroller-project.com

***************************************************/
#include <ESP8266WiFi.h>

const char* ssid = "Your SSID";
const char* password = "Your Wifi Password";

int BAT= A0; //Analog channel A0 as used to measure battery voltage
float RatioFactor=5.714; //Resistors Ration Factor
WiFiServer server(80);

void setup() {
Serial.begin(9600);
delay(10);
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);

while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
server.begin(); // Start the server
Serial.println("Server started");
// Print the IP address on serial monitor
Serial.print("Use this URL to connect: ");
Serial.print("http://"); //URL IP to be typed in mobile/desktop browser
Serial.print(WiFi.localIP());
Serial.println("/");
}

void loop() {
int value = LOW;
float Tvoltage=0.0;
float Vvalue=0.0,Rvalue=0.0;

// 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 request = client.readStringUntil('\r');
Serial.println(request);
client.flush();

// Match the request

if (request.indexOf("/bat=ON") != -1) {
/////////////////////////////////////Battery Voltage//////////////////////////////////
for(unsigned int i=0;i<10;i++){
Vvalue=Vvalue+analogRead(BAT); //Read analog Voltage
delay(5); //ADC stable
}
Vvalue=(float)Vvalue/10.0; //Find average of 10 values
Rvalue=(float)(Vvalue/1024.0)5; //Convert Voltage in 5v factor
Tvoltage=RvalueRatioFactor; //Find original voltage by multiplying with factor
/////////////////////////////////////Battery Voltage//////////////////////////////////
value = HIGH;
}

// Return the response
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println(""); // do not forget this one
client.println("");
client.println("");

client.println("Battery Voltage =");
client.print(Tvoltage);
client.println("
");

if(value == HIGH) {
client.println("Updated");
} else {
client.print("Not Updated");
}
client.println("--------");
if(Tvoltage<=5){
client.println("Battery dead OR disconnected");
}
else if(Tvoltage>5 && Tvoltage<=10){
client.println("Need Imediate recharge");
}
else if(Tvoltage>10 && Tvoltage<=12){
client.println("Recharge");
}
else{
client.println("Battery Full");
}

client.println("

");
client.println("<a href="/bat=ON"">Status
");
client.println("");
delay(1);
Serial.println("Client disonnected");
Serial.println("");

}

Taifun · December 28, 2019, 3:23pm

see this exampple

Taifun

Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by Taifun.

ABG · December 28, 2019, 9:38pm

See the Arduino and WiFi section of FAQ
https://sites.google.com/view/ai2-faq-view/home
for esp8266 samples.

Taifun · July 23, 2022, 11:51am

It does not look like you read the linked thread... it does not use any extension ...
Taifun
PS: I will close this thread, as it is already a few years old... feel free to start a new thread and read first

Taifun · July 23, 2022, 11:52am