A micropython example of HTTP (json) data retrieval with handling of wifi connection errors on the Pico W board.

main.py

import uasyncio as aio
from machine import Pin
import network
import rp2
import errno
import urequests
import gc
from private_data import WIFI_SSID, WIFI_KEY


# some const
MODE_DEBUG = False
# log levels
LVL_ERROR = 40
LVL_WARNING = 30
LVL_INFO = 20
LVL_DEBUG = 10
LVL_NOTSET = 0

# some class
class BasicLog:
    def __init__(self, lvl=LVL_DEBUG):
        self.lvl = lvl
    
    def log(self, msg, lvl=LVL_NOTSET):
        if lvl >= self.lvl:
            print(msg)
    
    def debug(self, msg):
        self.log(f'DEBUG:{msg}', lvl=LVL_DEBUG)

    def info(self, msg):
        self.log(f'INFO:{msg}', lvl=LVL_INFO)
    
    def warning(self, msg):
        self.log(f'WARN:{msg}', lvl=LVL_WARNING)

    def error(self, msg):
        self.log(f'ERROR:{msg}', lvl=LVL_ERROR)


# asyncio tasks
async def radio_task():
    while True:
        # wlan connect (ensure wlan is disconnect before)
        log.info('wlan connect')
        wlan.disconnect()
        wlan.connect(WIFI_SSID, WIFI_KEY)

        # wait for connection
        log.info('waiting for connection')
        connect_try = 0
        while connect_try < 10:
            log.debug(f'{connect_try=}')
            connect_try += 1
            if wlan.status() == network.STAT_GOT_IP:
                log.info(f'wlan connected, @IP={wlan.ifconfig()[0]}')
                break
            await aio.sleep_ms(1000)
       
        # periodic connection check
        while wlan.status() == network.STAT_GOT_IP:
            await aio.sleep_ms(1000)
        log.warning('wlan seem disconnected, restart connect loop')

            
async def get_task():
    # send LED command, escape this loop for wifi reconnect on nedd
    while True:
        try:
            if wlan.isconnected():
                log.info('get ISS data')
                # urequests is not write for asyncio, so we can block here (max time = timeout delay)
                r = urequests.get('http://api.open-notify.org/iss-now.json', timeout=4.0)
                log.info(f'ISS data: {r.json()}')
                gc.collect()
        except OSError as e:
            log.warning(f'error occur: {e}')
            if e.errno == errno.EINPROGRESS:
                wlan.disconnect()
        await aio.sleep_ms(5000)


if __name__ == '__main__':
    # init I/O
    led = Pin('LED', Pin.OUT)
    # init logging
    log = BasicLog(lvl=LVL_DEBUG if MODE_DEBUG else LVL_INFO)
    # wlan setup
    rp2.country('FR')
    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)
    # disable powersaving mode
    wlan.config(pm=0xa11140)

    # init asyncio tasks and run
    loop = aio.get_event_loop()
    loop.create_task(radio_task())
    loop.create_task(get_task())
    loop.run_forever()