for ap in esp.scan_networks():
print("\t%s\t\tRSSI: %d" % (str(ap['ssid'], 'utf-8'), ap['rssi']))
Connects to the AP we've defined here, then prints out the local IP address, attempts to do a domain
name lookup and ping google.com to check network connectivity (note sometimes the ping fails or takes
a while, this isn't a big deal)
print("Connecting to AP...")
esp.connect_AP(b'MY_SSID_NAME', b'MY_SSID_PASSWORD')
print("Connected to", str(esp.ssid, 'utf-8'), "\tRSSI:", esp.rssi)
print("My IP address is", esp.pretty_ip(esp.ip_address))
print("IP lookup adafruit.com: %s" % esp.pretty_ip(esp.get_host_by_name("adafruit.com")))
print("Ping google.com: %d ms" % esp.ping("google.com"))
OK now we're getting to the really interesting part. With a SAMD51 or other large-RAM (well, over 32 KB)
device, we can do a lot of neat tricks. Like for example we can implement an interface a lot like
requests (https://adafru.it/E9o) - which makes getting data
really really easy
To read in all the text from a web URL call requests.get - you can pass in https URLs for SSL connectivity
TEXT_URL = "http://wifitest.adafruit.com/testwifi/index.html"
print("Fetching text from", TEXT_URL)
r = requests.get(TEXT_URL)
print('-'*40)
print(r.text)
print('-'*40)
r.close()
Or, if the data is in structured JSON, you can get the json pre-parsed into a Python dictionary that can be
easily queried or traversed. (Again, only for nRF52840, M4 and other high-RAM boards)
JSON_URL = "http://api.coindesk.com/v1/bpi/currentprice/USD.json"
print("Fetching json from", JSON_URL)
r = requests.get(JSON_URL)
print('-'*40)
print(r.json())
print('-'*40)
r.close()
Requests
We've written a requests-like (https://adafru.it/Kpa) library for web interfacing
named Adafruit_CircuitPython_Requests (https://adafru.it/FpW). This library allows you to send HTTP/1.1
requests without "crafting" them and provides helpful methods for parsing the response from the server.
Here's an example of using Requests to perform GET and POST requests to a server.
# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT
# adafruit_requests usage with an esp32spi_socket
import board
import busio
from digitalio import DigitalInOut
import adafruit_esp32spi.adafruit_esp32spi_socket as socket
© Adafruit Industries https://learn.adafruit.com/adafruit-airlift-shield-esp32-wifi-co-processor Page 28 of 56
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