Controlling Things using WebServer(MicroPython) | Codegnan | MicroPython
The Hypertext Transfer Protocol (HTTP) is a standard application layer protocol that functions as a request-response protocol between server and client.
It is widely used in IoT (Internet of Things) embedded applications, where every sensor is connected to a server and we have access to control them over the internet.
NodeMCU has Wi-Fi functionality available on board. With this Wi-Fi functionality, NodeMCU can connect to any wi-fi network as a client or it can create a network to which other wi-fi enabled devices can connect.
NodeMCU as HTTP Server using Wi-Fi AP mode
NodeMCU wi-fi has Access Point (AP) mode through which it can create Wireless LAN to which any wi-fi enabled device can connect as shown in the below figure.
NodeMCU as HTTP Server using Wi-Fi AP mode
We can set SSID and Password for AP mode which will be used to authenticate other devices while connecting to it.
NodeMCU as HTTP Server using Wi-Fi STA mode
NodeMCU has Station (STA) mode using which can connect to the existing wi-fi network and can act as an HTTP server with an IP address assigned by that network.
NodeMCU as HTTP Server using Wi-Fi STA mode
NodeMCU gets IP from the Wi-Fi router to which it is connected. With this IP address, it can act as an HTTP server to which any wi-fi device can connect.
Let’s write Arduino Sketch to enable NodeMCU as an HTTP server with Wi-Fi STA/AP mode and control an LED connected at the server-side from the client-side.
HTML page for client
As we are making an HTTP server for LED on/off functionality, we are going to make a simple HTML page that will be visible at the client-side and able to take user input for LED on/off. It is a user-friendly representation of button input that takes input from the user on click.
We need to write two HTML pages for LED ON and LED OFF state i.e. when a client clicks the LED ON button, then in the next action, we need to provide options for LED OFF. Below are the two HTML code snippets for LED ON and LED OFF state presentation
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