Controlling sending data on a socket #16176

moferreira · 2024-11-07T09:37:30Z

moferreira
Nov 7, 2024

Can someone help me here on the "best practices" to avoid buffer overflow when transmitting data over WiFi on a ESP32?

Why? Because I have cloned a code somewhere to create a socket and emulate a web server. However, I am having problems sending large pages (over 6K).

An excerpt of my code is:

def web_server(conn):
    try:
        request = conn.recv(1024)
        request_str = request.decode()

        if request_str.startswith("get / "):
            conn.send(home_page())

        elif request_str.startswith("get /data "):
            conn.send(get_data())
        else:
            conn.send(b"HTTP/1.1 404 Not Found\r\n")
            conn.send(b"Content-Type: text/html\r\n")
            conn.send(b"\r\n")
            conn.send(b"<html><body><h1>404 Not Found</h1></body></html>")

    except OSError as e:
            print("Connection error:", e)

    finally:
        conn.close()

def accept_web_connection(server):
    global client_socket
    if client_socket:
        client_socket.close()
    client_socket, addr = server.accept()
    client_socket.setblocking(False)
    client_socket.setsockopt(socket.SOL_SOCKET, 20, uos.dupterm_notify)
    web_server(client_socket)

def start_web_server(port=80):
    global server_socket
    stop_web_server()
    server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    server_socket.bind(('', port))
    server_socket.listen(1)
    server_socket.setsockopt(socket.SOL_SOCKET, 20, accept_web_connection)
    for i in (network.AP_IF, network.STA_IF):
        wlan = network.WLAN(i)
        if wlan.active() and DEBUG:
            print("Web server started on {}:{}".format(wlan.ifconfig()[0], port))

So, how can I control the flow of sending data over the socket to prevent overflowing it? And yes, I am in the process of learning MicroPython and ESP32 and any help will be really appreciated.

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

MicroPython

Controlling sending data on a socket #16176

Uh oh!

{{title}}

Uh oh!

Replies: 0 comments

Select a reply

Uh oh!

MicroPython

Controlling sending data on a socket #16176

Uh oh!

moferreira Nov 7, 2024

Replies: 0 comments

moferreira
Nov 7, 2024