User manual

This command establishes a TCP connection to the website www.example.com.

Port 80 is the standard port for HTTP-queries. After confirmation of the connection

with OK you can enter the next command, which you already know:

AT+CIPSEND=40

You want to send a message through the connection you have just established,

after all. When you are asked to enter a text with >, first enter

GET / HTTP/1.1

and then push

[Enter]

will not appear on the serial monitor, but the

module will have received it. Then the message continues with

Host:www.example.com

followed by

[Enter]

twice. You need to send the inputs very quickly in sequence,

however. Best prepare a text document from which you can copy the lines quickly.

A long text is returned. The first part is the response of the server, containing

some information for the browser. The text after <!document html> is the website

that you can also see when you call the page www.example.com directly, but

purely text-based. A browser would interpret this text and present it in a form that

we understand.

Excerpt from the answer of the web server

This example shows the basics of the HTTP format. A client connects to a web

server. The DNS (Domain Name System) makes it possible to enter the domain

name in text form instead of the IP. It will forward the query to an IP that would be