Now that you're connected, you will probably want to get data from the Internet! Here's a demo showing how you can get data from the web via a URL.

The ESP supports SSL, so if you want to use secure connections, start the URL with https://.

Update your SSID and password and try it out!

# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT

import time
import board
import busio
from digitalio import DigitalInOut
from digitalio import Direction
import adafruit_requests as requests
import adafruit_espatcontrol.adafruit_espatcontrol_socket as socket
from adafruit_espatcontrol import adafruit_espatcontrol


# Get wifi details and more from a secrets.py file
try:
    from secrets import secrets
except ImportError:
    print("WiFi secrets are kept in secrets.py, please add them there!")
    raise

# Debug Level
# Change the Debug Flag if you have issues with AT commands
debugflag = False

# How long between queries
TIME_BETWEEN_QUERY = 60  # in seconds

if board.board_id == "challenger_rp2040_wifi":
    RX = board.ESP_RX
    TX = board.ESP_TX
    resetpin = DigitalInOut(board.WIFI_RESET)
    rtspin = False
    uart = busio.UART(TX, RX, baudrate=11520, receiver_buffer_size=2048)
    esp_boot = DigitalInOut(board.WIFI_MODE)
    esp_boot.direction = Direction.OUTPUT
    esp_boot.value = True
    status_light = None
else:
    RX = board.ESP_TX
    TX = board.ESP_RX
    resetpin = DigitalInOut(board.ESP_WIFI_EN)
    rtspin = DigitalInOut(board.ESP_CTS)
    uart = busio.UART(TX, RX, timeout=0.1)
    esp_boot = DigitalInOut(board.ESP_BOOT_MODE)
    esp_boot.direction = Direction.OUTPUT
    esp_boot.value = True
    status_light = None

print("ESP AT commands")
esp = adafruit_espatcontrol.ESP_ATcontrol(
    uart, 115200, reset_pin=resetpin, rts_pin=rtspin, debug=debugflag
)

URL = "http://wifitest.adafruit.com/testwifi/index.html"
print("ESP AT GET URL", URL)

print("Resetting ESP module")
esp.hard_reset()

requests.set_socket(socket, esp)

while True:
    try:
        print("Checking connection...")
        while not esp.is_connected:
            print("Connecting...")
            esp.connect(secrets)
        # great, lets get the data
        print("Retrieving URL...", end="")
        r = requests.get(URL)
        print("Status:", r.status_code)
        print("Content type:", r.headers["content-type"])
        print("Content size:", r.headers["content-length"])
        print("Encoding:", r.encoding)
        print("Text:", r.text)
        print("Sleeping for: {0} Seconds".format(TIME_BETWEEN_QUERY))
        time.sleep(TIME_BETWEEN_QUERY)
    except (ValueError, RuntimeError, adafruit_espatcontrol.OKError) as e:
        print("Failed to get data, retrying\n", e)
        continue

While we work on the library, you may notice it takes a lot of retries to get going. Did we mention parsing AT commands isn't the most fun way to communicate with the Internet? However, it will eventually work and usually once it starts working, it will keep up.

Notice that we add loops and try: except: blocks to catch failures and automatically retry our commands, this is essential for any network project due to the inconsistencies/reliability issues you will experience. That's true even for Ethernet!

This guide was first published on Dec 16, 2018. It was last updated on Dec 16, 2018.

This page (AT: Webclient Demo) was last updated on Nov 29, 2021.

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