ESPWifiServer

Description

Here the idea is, I am using ESP8266 wifi module to control appliances in a room using my home wifi network. But I was facing a issue that if I changed the ssid and wifi-password then I was not able to connect to my wifi. For the solution of this problem I thought of OTA (Over the Air) update of my ESP8266 firmware(code) with updated password in it. For this I thought since I would not be able to connect to my wifi because of password change, let's use the ESP8266's (AP)access-point feature which creates its own hotspot. I can connect to access-point to update my ESP8266's firmware. If you want a web server with static ip in your ESP8266 wifi module which is capable of creating access-point from which you can update firmware of your ESP8266, you can use this arduino code. Here GPIO5 pin of ESP8266-12 module(const int pin = 5;) is used for controlling relay or leds. For that you have to do follwing changes in the code:

• First thing is, you will have to provide your wifi's ssid and wifipassword in the code.

const char* ssid = "mywifi";
const char* password = "password";

• Then you will have to provide give a desired ssid and password for connecting to your ESP8266 through AccessPoint to update firmware. It can be anything.

const char *esp_ssid = "your_desired_ssid";
const char *esp_password = "your_desired_password";

• Now this is for authorization before updating ESP8266's firmware.

const char* www_username = "admin";
const char* www_password = "password";

• Get your gateway(or router) and subnet, then set the desired ip according to your gateway.

IPAddress ip(192, 168, 1, xx); // where xx is the desired IP Address
IPAddress gateway(192, 168, 1, 254); // set gateway to match your wifi network
IPAddress subnet(255, 255, 255, 0); // set subnet mask to match your wifi network

• Now just use you ip, gateway and subnet to set static ip in void setup().

void setup(){
	......
	WiFi.config(ip, gateway, subnet);
	......
}

##Basic Requirements Flash chip size should 2x the size of the sketch for using OTA update for your ESP8266 Wifi module.

How to use

1. To control your home appliances, go to your web-browser,

• Use http://your-ip/on to turn ON GPIO pins.
• Use http://your-ip/off to turn OFF GPIO pins.
• Use http://your-ip/status to get status(ON/OFF) of GPIO pins.

2. To update firmware(code) of your ESP8266 wifi module,

• Use http://your-ip/fupdate to update firmware.
  • Give authorized user-name and password which you already set in the code.
  • After authorization ESP8266's access-point will enable.
  • Connect your computer to ESP8266's local hotspot network.
  • Choose your firmware.bin file (example: updateHttpServer.ino.generic.bin) to upload and click Upload button.
  • If firmware will be uploaded successfully, you will get OK message on your browser.
  • After uploading, restart your ESP8266 wifi module.

Note:

• If you went http://your-ip/fupdate and did authorization successfully but haven't uploaded new firmware then restart the ESP8266 module so the ESP8266's AP(access-point) mode will stop and don't consume unnecessary power.
  
• If firmware updation will fail, restart the ESP8266. It will re-run the old code and try to upload firmware again.
  
• Sometimes it takes 3-5 attempts to upload firmware successfully.

Tools

You can download ArdroidHttpClient to send request via HTTP. Or you can download or fork the project from link on git-hub and build apk using Android Studio and install to your android phone. You will have to provide a name(any name), your ESP8266 ip (the static ip) and port(as given in the code port is 80). Now you can control your home appliances using the app.
This android application is not for updating firmware. You can use browser for that purpose.

Note:

While using this code with ESP8266 wifi module, you phone or computer should be on same network.

Connections: