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This updates the minimal supported version of CMake to 3.16, which in turn enables us to use more CMake features and have a cleaner build system. This is the version that provides most new features and also the one we use in our latest docker image for CI.
HTTP Request Example
(See the README.md file in the upper level 'examples' directory for more information about examples.)
Uses a POSIX socket to make a very simple HTTP request.
How to use example
Before project configuration and build, be sure to set the correct chip target using idf.py set-target <chip_name>.
Hardware Required
- A development board with ESP32/ESP32-S2/ESP32-C3 SoC (e.g., ESP32-DevKitC, ESP-WROVER-KIT, etc.)
- A USB cable for power supply and programming
Configure the project
idf.py menuconfig
Open the project configuration menu (idf.py menuconfig) to configure Wi-Fi or Ethernet. See "Establishing Wi-Fi or Ethernet Connection" section in examples/protocols/README.md for more details.
Build and Flash
Build the project and flash it to the board, then run monitor tool to view serial output:
idf.py -p PORT flash monitor
(Replace PORT with the name of the serial port to use.)
(To exit the serial monitor, type Ctrl-].)
See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
Example Output
I (10557) example_connect: - IPv4 address: 192.168.194.219
I (10557) example_connect: - IPv6 address: fe80:0000:0000:0000:266f:28ff:fe80:2c74, type: ESP_IP6_ADDR_IS_LINK_LOCAL
W (10577) wifi:<ba-add>idx:0 (ifx:0, ee:6d:19:60:f6:0e), tid:0, ssn:3, winSize:64
I (10587) example: DNS lookup succeeded. IP=93.184.216.34
I (10587) example: ... allocated socket
I (10917) example: ... connected
I (10917) example: ... socket send success
I (10927) example: ... set socket receiving timeout success
HTTP/1.0 200 OK
Age: 317271
Cache-Control: max-age=604800
Content-Type: text/html; charset=UTF-8
Date: Mon, 06 Sep 2021 08:09:49 GMT
Etag: "3147526947+ident"
Expires: Mon, 13 Sep 2021 08:09:49 GMT
Last-Modified: Thu, 17 Oct 2019 07:18:26 GMT
Server: ECS (nyb/1D2B)
Vary: Accept-Encoding
X-Cache: HIT
Content-Length: 1256
Connection: close
<!doctype html>
<html>
<head>
<title>Example Domain</title>
<meta charset="utf-8" />
<meta http-equiv="Content-type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<style type="text/css">
body {
background-color: #f0f0f2;
margin: 0;
padding: 0;
font-family: -apple-system, system-ui, BlinkMacSystemFont, "Segoe UI", "Open Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
}
div {
width: 600px;
margin: 5em auto;
padding: 2em;
background-color: #fdfdff;
border-radius: 0.5em;
box-shadow: 2px 3px 7px 2px rgba(0,0,0,0.02);
}
a:link, a:visited {
color: #38488f;
text-decoration: none;
}
@media (max-width: 700px) {
div {
margin: 0 auto;
width: auto;
}
}
</style>
</head>
<body>
<div>
<h1>Example Domain</h1>
<p>This domain is for use in illustrative examples in documents. You may use this
domain in literature without prior coordination or asking for permission.</p>
<p><a href="https://www.iana.org/domains/example">More information...</a></p>
</div>
</body>
</html>
I (11467) example: ... done reading from socket. Last read return=0 errno=128.
I (11477) example: 10...
I (12477) example: 9...
I (13477) example: 8...