Difference: WEBServerPicoweb (6 vs. 7)

Revision 72020-06-08 - UliRaich

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META TOPICPARENT	name="InternetAccess"

A WEB Server on the ESP32

A "Hello World!" WEB server

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Version 3 works in a similar fashion to Version 2 but the HTML file is gzipped. Since the ESP32 has little free "disk space", well, space in its flash, it is interesting to compress the HTML file to save resources.

Version 1

Changed:

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<

Let's start simple and produce a WEB server that just sends "Hello World!" to the browser when called. You may add some HTML text if desired. In the first version we will write a TCP server creating a stream socket and binding to port 80.

s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) try:
   s.bind(('',80))
except OSError as exception:
   if exception.args[0] == uerrno.EADDRINUSE:
   print("Socket is already bound, please reset the machine")
   sys.exit()

The server then starts listening for an incoming connection request and establishes a connection by accepting it.

s.listen(5)
print("Starting the Hello World WEB server on IP address ",ipaddr,"port 80")
while True:
conn,addr=s.accept() print("GOT a connection from %s" % str(addr))

Finally it reads an http request from the connection and answers with its Hello World page:

request=conn.recv(1024)
print("Content %s" % str(request))
request=str(request) response=html
conn.send(response) conn.close()

html is the http string to be sent, e.g.

html = """ <!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<title>Hello World </title>
<h1>The Hello World! HTML page</h1>
<p>Hello World!</p>

</body>
</html>
"""

Please check https://docs.micropython.org/en/latest/library/usocket.html for more details.

>
>

Version 1 is the basic WEB server we implemented in BasicWEBServer

Version 2:

In the second version we will separate the HTML text from the server and store it in the html directory (to be created with ampy: ampy mkdir /html) on the ESP32. Now we can use a ready made Web server for MicroPython, picoweb to serve the page. picoweb and utemplates (see exercise 2) are already included in the MicroPython binary.

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