todbot · December 5, 2020 06:18
diff --git a/wifi-preferred-network.py b/wifi-preferred-network.py
 #
 # wifi-preferred-network.py -- Given a list of preferred networks,
 #                              connect to the one with the strongest signal
 #                              for CircuitPython ESP32S2 Metro / MagTag 
 # 2020 @todbot / todbot.com/blog

 import time
 import wifi
 from secrets import secrets

 def find_preferred_network(ssid_prefs, networks=None):
    """Return a preferred Network and password given a list of preferred SSIDs.
    :param list ssid_prefs: list of ssid/password pairs in secrets.py format.
    :param list networks: list of wifi.Network objects, or None to perform scan.
    :returns: (Network,password): The wifi.Network and password most preferred

    Example:
    .. code-block:: python
      ssid_prefs = [ {'ssid':'todbot', 'password':'toomanysecrets'},
                     {'ssid':'todbot2', 'password':'setecastronomy'}]
      (my_network,my_password) = find_preferred_network(ssid_prefs)
    """
    if not networks:
        networks = []
        for network in wifi.radio.start_scanning_networks():
            networks.append(network)
        wifi.radio.stop_scanning_networks()
    # sort by signal strength
    networks = sorted(networks, key=lambda net: net.rssi, reverse=True)
    # find first preferred network that matches
    for network in networks:
        for ssid_pref in ssid_prefs:
            if ssid_pref['ssid'] == network.ssid:
                return(network, ssid_pref['password'])

 # Demonstrate how to use "find_preferred_network()"
 print("Finding preferred network...")
 (my_network, my_password) = find_preferred_network( secrets['ssid_prefs'] )
                
 print("Connecting to %s" % my_network.ssid)
 wifi.radio.connect(ssid=my_network.ssid, password=my_password, channel=my_network.channel)

 while True:
    print(time.monotonic(), "hi there")
    time.sleep(5)


 # Can also call it with an explicit list of networks, like:
 # print("looking for networks:")
 # networks = []
 # for network in wifi.radio.start_scanning_networks():
 #     networks.append(network)
 #     print("  ssid:%s \t\t channel:%d" % (network.ssid,network.channel))
 # wifi.radio.stop_scanning_networks()
 #
 # print("Finding preferred network...")
 # (my_network, my_password) = find_preferred_network( secrets['ssid_prefs'], networks )
 # print("Connecting to %s" % my_network.ssid)
 # wifi.radio.connect(ssid=my_network.ssid, password=my_password, channel=my_network.channel)
	#
	# wifi-preferred-network.py -- Given a list of preferred networks,
	# connect to the one with the strongest signal
	# for CircuitPython ESP32S2 Metro / MagTag
	# 2020 @todbot / todbot.com/blog

	import time
	import wifi
	from secrets import secrets

	def find_preferred_network(ssid_prefs, networks=None):
	"""Return a preferred Network and password given a list of preferred SSIDs.
	:param list ssid_prefs: list of ssid/password pairs in secrets.py format.
	:param list networks: list of wifi.Network objects, or None to perform scan.
	:returns: (Network,password): The wifi.Network and password most preferred

	Example:
	.. code-block:: python
	ssid_prefs = [ {'ssid':'todbot', 'password':'toomanysecrets'},
	{'ssid':'todbot2', 'password':'setecastronomy'}]
	(my_network,my_password) = find_preferred_network(ssid_prefs)
	"""
	if not networks:
	networks = []
	for network in wifi.radio.start_scanning_networks():
	networks.append(network)
	wifi.radio.stop_scanning_networks()
	# sort by signal strength
	networks = sorted(networks, key=lambda net: net.rssi, reverse=True)
	# find first preferred network that matches
	for network in networks:
	for ssid_pref in ssid_prefs:
	if ssid_pref['ssid'] == network.ssid:
	return(network, ssid_pref['password'])

	# Demonstrate how to use "find_preferred_network()"
	print("Finding preferred network...")
	(my_network, my_password) = find_preferred_network( secrets['ssid_prefs'] )

	print("Connecting to %s" % my_network.ssid)
	wifi.radio.connect(ssid=my_network.ssid, password=my_password, channel=my_network.channel)

	while True:
	print(time.monotonic(), "hi there")
	time.sleep(5)


	# Can also call it with an explicit list of networks, like:
	# print("looking for networks:")
	# networks = []
	# for network in wifi.radio.start_scanning_networks():
	# networks.append(network)
	# print(" ssid:%s \t\t channel:%d" % (network.ssid,network.channel))
	# wifi.radio.stop_scanning_networks()
	#
	# print("Finding preferred network...")
	# (my_network, my_password) = find_preferred_network( secrets['ssid_prefs'], networks )
	# print("Connecting to %s" % my_network.ssid)
	# wifi.radio.connect(ssid=my_network.ssid, password=my_password, channel=my_network.channel)