[Errno 22] EINVAL if Host is given instead of IP in HTTPS request

[valenzmanu]

I'm trying to make a HTTPS request, so I'm using the firmware in https://github.com/sipeed/MaixPy/tree/develop since the ussl module is needed.

When I try to connect using the hostname I get [Errno 22] EINVAL in socket.getaddrinfo(HOST, PORT)[0][-1] . I tried changing hostname to the public IP (using a service like this: https://www.cdmon.com/es/conversor-host-ip) and I no longer got this error, however I think this is a problem since the public IP might change at any given time.

Here is a snippet of my code (I'm using a maixduino, and it was already connected to a wifi network):

import ussl
import socket

# define host and port
HOST = 'host name'
# HOST = 'host ip'
PORT = 443
PROTO = "HTTPS"
RETRY = 3

# make connection
sock = socket.socket()
for i in range(RETRY):
    try:
        addr = socket.getaddrinfo(HOST, PORT)[0][-1]
        print('addr:', addr)
        break
    except Exception as exc:
        print('addr error: ', exc)
try:
    sock.connect(addr)
    print('Connected')
except Exception as exc:
    print('connect error', exc)

# use ssl encryption if https
if(PROTO == "HTTPS"):
    ussl.wrap_socket(sock)
    print('ussl: socket encrypted')

# try to send a GET request
write_res = sock.write('''GET / HTTP/1.1
Host: host_name
Cache-Control: no-cache

''')

# get response
while True:
    read_res = sock.readline()
    if not read_res or read_res == b'\r\n':
        break

print('bytes written:', write_res)
print('response:', sock.read())

[valenzmanu]

@junhuanchen

[junhuanchen]

Ah, sorry, this socket.getAddrInfo is implemented on the AT network card, which means it needs to support HTTPS on the network card, not the built-in function of K210.

Maybe you may configure or burn the firmware for ES8285/ESP32 that supports HTTPS parsing.

Such as

        try:
            err = 0
            while 1:
                try:
                    self._socketAddr = socket.getaddrinfo(host, port)[0][-1]
                    break
                except Exception:
                    err += 1
                if err > 5:
                    raise Exception("get ip failed!")
            #cli = socket.socket()
            cli = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            cli.settimeout(self.ConnTimeoutSec)
            cli.connect(self._socketAddr)
        except:
            raise Exception('Error to connect to %s:%s' % (host, port))

[valenzmanu]

Thanks,

I'm not sure what firmware to burn into the ESP32 or how to do it. Should I use the USB-C port? I see the ESP32 is connected to the CH552 which is connected to the USB port. If so, what software do you recommend? I've been using Kflash ever since I started using the Maixduino, will it work to burn ESP32 firmware?

Regarding your code, I don't quite understand where should it be at? What Class self._socketAddr refers to?

[junhuanchen]

I'm not sure what you're using right now, but you can try burning AT firmware for ESP8266 and try AT parsing HTTPS to get IP. It's much easier for you

[junhuanchen]

Not all HTTPS gets IP

[junhuanchen]

This is a bug that relies on an external network.