ESP32SPI find and connect to an open wi-fi AP

code.py

import board
from digitalio import DigitalInOut
from adafruit_esp32spi import adafruit_esp32spi


def esp_reset():
    try:
        esp.reset()
        print('ESP Reset')
    except RuntimeError as e:
        print('ESP Reset Error:', e)

def esp_connect(ssid, pw=False):
    esp_status = 255
    try:
        esp_status = esp.status
    except RuntimeError as e:
        print('ESP Status Error:', e)
        esp_reset()
    try:
        esp_is_connected = esp.is_connected
    except RuntimeError as e:
        print('ESP Is Connected Error:', e)
        esp_reset()

    # these should never disagree?
    if esp_status == 3 and esp_is_connected:
        pass  # already connected
    else:
        try:
            print('ESP Connecting...', end=' ')
            esp.connect_AP(ssid, pw)
            esp_status = esp.status
            esp_is_connected = esp.is_connected
            print(esp_status, esp_is_connected)
        except RuntimeError as e:
            print('ESP Connection Error:', e)
            esp_reset()
    return esp_status, esp_is_connected


print('ESP32...')
spi = board.SPI()
try:  # PyPortal, etc.
    esp32_cs = DigitalInOut(board.ESP_CS)
    esp32_ready = DigitalInOut(board.ESP_BUSY)
    esp32_reset = DigitalInOut(board.ESP_RESET)
except AttributeError:  # Airlift FeatherWing & Bitsy Add-On
    esp32_cs = DigitalInOut(board.D13)  # M4 Red LED
    esp32_ready = DigitalInOut(board.D11)
    esp32_reset = DigitalInOut(board.D12)
esp = adafruit_esp32spi.ESP_SPIcontrol(spi, esp32_cs, esp32_ready, esp32_reset)

espfw = ''
for _ in esp.firmware_version:
    espfw += '{:c}'.format(_)
print('ESP Firmware:    ', espfw)
print('ESP MAC addr:     {5:02X}:{4:02X}:{3:02X}:{2:02X}:{1:02X}:{0:02X}'.format(*esp.MAC_address))
print('ESP Status:      ', esp.status, esp.is_connected)

print("Scanning WiFi...")
while True:
    try:
        found = False
        best_open_ap = None
        for ap in esp.scan_networks():
            print('   ', ap)
            # scan results are ordered from best to worst RSSI
            if not found and ap['encryption'] == 7:
                found = True
                best_open_ap = ap['ssid']
        break
    except RuntimeError as e:
        print('ESP Scanning Error:', e)
        esp_reset()

if best_open_ap:
    while True:
        try:
            if esp_connect(best_open_ap) == (3, True):
                print('RSSI:   ', esp.rssi)
                print('SSID:    ', str(esp.ssid, 'utf-8'))
                print('IP:      ', esp.pretty_ip(esp.ip_address))
                print('Netmask:  %d.%d.%d.%d' % (esp.network_data['netmask'][0], esp.network_data['netmask'][1], esp.network_data['netmask'][2], esp.network_data['netmask'][3]))
                print('Gateway:  %d.%d.%d.%d' % (esp.network_data['gateway'][0], esp.network_data['gateway'][1], esp.network_data['gateway'][2], esp.network_data['gateway'][3]))
                print('LAN ping: %dms' % esp.ping(esp.network_data['gateway']))
                break
        except RuntimeError as e:
            print('ESP Error:', e)
            esp_reset()
else:
    print('No open wi-fi networks found.')

print('Done.')

Adafruit CircuitPython 5.0.0-alpha.4 on 2019-09-15; Adafruit PyPortal with samd51j20
adafruit-circuitpython-bundle-5.x-mpy-20190917