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.

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Controlling sending data on a socket #16176

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MicroPython

Controlling sending data on a socket #16176

moferreira Nov 7, 2024

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moferreira
Nov 7, 2024