User Manual

Verifies an ESP32 is found, checks the firmware and MAC address

Performs a scan of all access points it can see and prints out the name and signal strength:

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)

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

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)

Requests

if esp.status == adafruit_esp32spi.WL_IDLE_STATUS:

print("ESP32 found and in idle mode")

print("Firmware vers.", esp.firmware_version)

print("MAC addr:", [hex(i) for i in esp.MAC_address])

for ap in esp.scan_networks():

print("\t%s\t\tRSSI: %d" % (str(ap['ssid'], 'utf-8'), ap['rssi']))

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"))

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()

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()

https://learn.adafruit.com/adafruit-airlift-featherwing-esp32-wifi-co-

processor-featherwing

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