Just retyped this for the sake of improved readability. You might want to save it as /flash/lib/dnstest.py.
import time
import usocket
import machine
import _thread
"""
>>> import dnstest; dnstest.dns_lookup('google.com')
0 None
1 (2, 1, 0, '', ('172.217.18.14', 443))
2 (2, 1, 0, '', ('172.217.18.14', 443))
3 (2, 1, 0, '', ('172.217.18.14', 443))
4 (2, 1, 0, '', ('172.217.18.14', 443))
"""
response = None
def run_getaddrinfo(host, port):
global response
response = usocket.getaddrinfo(host, port)[0]
def dns_lookup(hostname, timeout=5):
_thread.start_new_thread(run_getaddrinfo, (hostname, 443))
for i in range(timeout):
print(i, response)
machine.idle()
time.sleep(1)
print('Ready.')
It works flawlessly over a WiFi connection, but LTE might well have its delicacies.
