MicroPython Forum (Archive)

Posted: **Wed Jan 25, 2017 11:22 am**

Anybody has an example for how to have multiple networks in the boot.py so it searches which ssid gives it's password and prints which is connected to. I can do I for one network, but cant add a second to be read automatic.

Posted: **Wed Jan 25, 2017 4:31 pm**

@blckpstv This could be useful for you.... I had to solve the same problem... change the place of work with other APs

Code: Select all

##...module aps_trusted.py
##APS = {
##    "ssid1":"psw1",
##    "ssid2":"psw2",
##    "ssidN":"pswN"
##}

##...module boot.py
## Create connection to trusted AP
from aps_trusted import APS
from network import WLAN, STA_IF
from esp import osdebug
from time import sleep_ms

def try_connection():
    t = 12
    while not wlan.isconnected() and t > 0:
        print('.', end='')
        sleep_ms(500)
        t = t - 1
    return wlan.isconnected();

osdebug(None)
wlan = WLAN(STA_IF)
wlan.active(True)
print('connecting to last AP', end='')
print(try_connection())
if not wlan.isconnected():
    ## find all APs
    ap_list = wlan.scan()
    ## sort APs by signal strength
    ap_list.sort(key=lambda ap: ap[3], reverse=True)
    ## filter only trusted APs
    ap_list = list(filter(lambda ap: ap[0].decode('UTF-8') in 
              APS.keys(), ap_list))
    for ap in ap_list:
        essid = ap[0].decode('UTF-8')
        if not wlan.isconnected():
            print('connecting to new AP', essid, end='')
            wlan.connect(essid, APS[essid])
            print(try_connection())

#import webrepl
#webrepl.start()
import gc
gc.collect()
#import blink

Posted: **Wed Jan 25, 2017 9:56 pm**

profra wrote:@blckpstv This could be useful for you.... I had to solve the same problem... change the place of work with other APs

Code: Select all

##...module aps_trusted.py
##APS = {
##    "ssid1":"psw1",
##    "ssid2":"psw2",
##    "ssidN":"pswN"
##}

##...module boot.py
## Create connection to trusted AP
from aps_trusted import APS
from network import WLAN, STA_IF
from esp import osdebug
from time import sleep_ms

def try_connection():
    t = 12
    while not wlan.isconnected() and t > 0:
        print('.', end='')
        sleep_ms(500)
        t = t - 1
    return wlan.isconnected();

osdebug(None)
wlan = WLAN(STA_IF)
wlan.active(True)
print('connecting to last AP', end='')
print(try_connection())
if not wlan.isconnected():
    ## find all APs
    ap_list = wlan.scan()
    ## sort APs by signal strength
    ap_list.sort(key=lambda ap: ap[3], reverse=True)
    ## filter only trusted APs
    ap_list = list(filter(lambda ap: ap[0].decode('UTF-8') in 
              APS.keys(), ap_list))
    for ap in ap_list:
        essid = ap[0].decode('UTF-8')
        if not wlan.isconnected():
            print('connecting to new AP', essid, end='')
            wlan.connect(essid, APS[essid])
            print(try_connection())

#import webrepl
#webrepl.start()
import gc
gc.collect()
#import blink

Cool! I'm trying it next week at school! Thanks!

Posted: **Sun Jul 08, 2018 12:41 pm**

Thanks very much for this. I am using it with an ESP32. I commented out the 'from esp import osdebug' and 'osdebug(None)' lines. It seems to wo work very well.

Posted: **Fri Nov 15, 2019 9:55 pm**

Here's v2!

This supports scanning and connecting to hidden networks via MAC identification. Although the stock MicroPython software does NOT return hidden networks in scan(). I do not recommend blindly trying to connect to hidden networks, as connect() writes to the limited write flash memory. I recommend running in main.py over boot, as it takes time to execute. If anyone wants my custom v1.11 firmware that adds hidden SSID scanning, let me know. The file attach size is less than 380k here lol...

Edit: This code may have issues on ESP32 see https://github.com/micropython/micropython/issues/5326

Code: Select all

from network import WLAN, STA_IF, AP_IF, STAT_IDLE, STAT_CONNECTING, STAT_WRONG_PASSWORD, STAT_NO_AP_FOUND, STAT_CONNECT_FAIL, STAT_GOT_IP
from time import sleep
from ubinascii import hexlify

USE_AP = True # Turn On Internal AP After Failed WiFi Station Connection

NETWORKS = [ # SSID, PWD, [MAC] (Optional)
	['ssid1', 'pwd1', ['25288b12423d4']],
	['ssid2', 'pwd2'],
	['ssidN', 'pwdN']
]

station = WLAN(STA_IF)
local_ap = WLAN(AP_IF)

def connectWiFi():
	if not station.active():
		station.active(True)

	if waitForConnection():
		return True

	aps = station.scan()
	aps.sort(key=lambda ap:ap[3], reverse=True)

	for ap in aps:
		for net in NETWORKS:
			found = False
			if ap[0].decode('UTF-8') == net[0]:
				found = True
			elif len(net) == 3:
				for mac in net[2]:
					if hexlify(ap[1]).decode('UTF-8') == mac:
						found = True
						break

			if found:
				station.connect(net[0], net[1])
				if waitForConnection():
					if USE_AP and local_ap.active():
						local_ap.active(False)
					return True

	if USE_AP and not local_ap.active():
		local_ap.active(True)

	return False


def waitForConnection():
	while station.status() == STAT_CONNECTING:
		sleep(0.25)

	return station.isconnected()

connectWiFi()

MicroPython Forum (Archive)

Multiple networks in boot.py

Multiple networks in boot.py

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Re: Multiple networks in boot.py

Re: Multiple networks in boot.py