examples/network: Support IPv4 and IPv6 in HTTP client examples.

The main changes here are to pass the address family and socket type to
`getaddrinfo()`, and then use the result of the address lookup when
creating the socket, so it has the correct address family.

This allows both IPv4 and IPv6 to work, because the socket is created with
the correct AF_INETx type for the address.

Also add some more comments to the examples to explain what's going on.

Fixes issue #15580.

Signed-off-by: Damien George <damien@micropython.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/examples/network/https_client_nonblocking.py b/examples/network/https_client_nonblocking.py
index 6e6b7f37b..41447e81e 100644
--- a/examples/network/https_client_nonblocking.py
+++ b/examples/network/https_client_nonblocking.py
@@ -37,13 +37,13 @@ def read_nonblocking(poller, sock, n):
     return data
 
 
-def main(url):
+def main(url, addr_family=0):
     # Split the given URL into components.
     proto, _, host, path = url.split(b"/", 3)
     assert proto == b"https:"
 
     # Note: this getaddrinfo() call is blocking!
-    ai = socket.getaddrinfo(host, 443)[0]
+    ai = socket.getaddrinfo(host, 443, addr_family, socket.SOCK_STREAM)[0]
     addr = ai[-1]
     print("Connect address:", addr)