Networking

Now the standard networking resources - network, socket, requests, … - are available to the client.

Note: No support for select.

%connect wifi-client

Connected to wifi-client @ serial:///dev/ttyACM0

IP

import network

ip = network.WLAN(network.STA_IF).ifconfig()[0]
print("IP address:", ip)

IP address: 10.39.40.169

Webserver

Run the cell below, then click on the URL (“waiting for connection at …”).

import socket
import network

ip = network.WLAN(network.STA_IF).ifconfig()[0]

s = socket.socket()
ai = socket.getaddrinfo("0.0.0.0", 80)
addr = ai[0][-1]

s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind(addr)
s.listen(2)

print("waiting for connection at http://{}".format(ip))
for i in range(6):
    ss, addr = s.accept()
    print("connected from", addr)
    req = ss.recv(1024)
    if i < 4:
        ss.send('Hello from WiFi Coprocessor, serving request # {}!'.format(i+1).encode())
    else:
        ss.send(b'So long! Server shutting down.')
    ss.close()
s.close()

print("DONE")

waiting for connection at http://10.39.40.169
connected from ('10.39.40.114', 63858)
connected from ('10.39.40.114', 63859)
connected from ('10.39.40.114', 63860)
connected from ('10.39.40.114', 63861)
connected from ('10.39.40.114', 63862)
connected from ('10.39.40.114', 63863)
DONE

Requests

Example: Weather data from https://home.openweathermap.org/

Note: Create an account and define openweathermap_apiid in secrets.py.

from requests import get
from secrets import openweathermap_apiid

cnt = 1
url = "http://api.openweathermap.org/data/2.5/find?lat=38.5&lon=-120&cnt={}&appid={}".format(cnt, openweathermap_apiid)

j = get(url).json()
for k,v in j.get('list')[0].items():
    print("{:8} {}".format(k,v))

coord    {'lat': 38.4646, 'lon': -120.0399}
wind     {'speed': 1.2, 'deg': 167}
rain     None
weather  ({'id': 802, 'description': 'scattered clouds', 'icon': '03d', 'main': 'Clouds'},)
dt       1637683849
snow     None
clouds   {'all': 28}
main     {'feels_like': 274.32, 'pressure': 1022, 'temp_min': 268.16, 'humidity': 64, 'temp_max': 277.33, 'temp': 274.32}
name     Bear Valley
sys      {'country': 'US'}
id       5326968