No Wifi connection on boot

[poebler]

Hi,

it tried all example and tutorials but my LoPy is not connecting to wifi after a reset. The problem is always the same - it tries and fails. If i interrupt the script after a failed connection and paste the connect() to the REPL it is connecting fine, so basiclly my settings / credentials are fine.

here is my current wifi code:

known_nets = {
        # SSID : PSK (passphrase)
        'waterworld': '​secretkey'
    } # change this dict to match your WiFi settings

# test needed to avoid losing connection after a soft reboot
if machine.reset_cause() != machine.SOFT_RESET:
    from network import WLAN
    wl = WLAN(mode=WLAN.STA)

    while not wl.isconnected():
        print("new round")
        for ssid, bssid, sec, channel, rssi in wl.scan():
            # Note: could choose priority by rssi if desired

            try:
                print("trying to connect to " + ssid)
                wl.connect(ssid, (sec, known_nets[ssid]), timeout=5000)

                if not wl.isconnected():
                    print("reinit")
                    time.sleep(5)
                    wl.deinit()
                    wl.init(mode=WLAN.STA)
                break
            except KeyError:
                pass # unknown SSID
print(wl.ifconfig())

The funny thing on my code is now, after a reinit, th LoPy doesn't find my network anymore, so after that is goes to an endless loop.

What am i doing wrong?
Thanks for help!

[livius]

@poebler
You loop throught all networks in range
but you pass parameter only for known network

wl.connect(ssid, (sec, known_nets[ssid]), timeout=5000)

for unknown you pass None - i suppose this can be a problem here
i known that you include try except - but here it is reall wrong.
change your logic and
check before connect if this is known network if not then do not try to connect to it

[poebler]

Hi,
thanks for your reply. This could be a problem - but not the initial one, that i find my network but i'm not able to connect though my credentials are right and a manual connect succededs ...

Any other ideas?

Thanks in advance!

[livius]

@poebler
i was wrong in first post.
You do not pass None - you got error on dictionary key access and not tried to connect
then problem must be somewhere else.

But first question should be - what is your firmware version?

os.uname()

[poebler]

@livius 1.7.3.b2

[livius]

@poebler
what happened if you change this line
wl.connect(ssid, (sec, known_nets[ssid]), timeout=5000) to

wl.connect(ssid=ssid, auth=(sec, known_nets[ssid]), timeout=5000)

?

[poebler]

@livius tried this also - no change :/

[livius]

@poebler
what if you add debug info

print(time.ticks_ms())
wl.connect(ssid, (sec, known_nets[ssid]), timeout=5000)
print(time.ticks_ms())
if not wl.isconnected():
          print(time.ticks_ms())
          print("reinit")        

show debug info
and what if you change connection as static IP?

# go for fixed IP settings (IP, Subnet, Gateway, DNS)
wlan.ifconfig(config=('192.168.0.107', '255.255.255.0', '192.168.0.1', '192.168.0.1'))

any change?

[poebler]

@livius I'm at work so i can try it first this evening. But the connect methods returns after the 5 sec timeout and if it is not connecting a static IP won't help :/

[livius]

@poebler said in No Wifi connection on boot:

if it is not connecting a static IP won't help

Sometimes it help ;-)

[poebler]

@livius tried it. no success :(

[markN]

@poebler said in No Wifi connection on boot:
I had a similar problem connecting to my home wifi network using the standard wifi code example.
After some experimentation I found that a short wait immediately after the line containing "wlan.connect(...)" cured the issue in my code. I assume this may be a bug, possibly some kind of internal race condition between wlan.connect() and wlan.isconnected().
If its the same problem this extra line in your code might help.

            wl.connect(ssid, (sec, known_nets[ssid]), timeout=5000)
            time.sleep(1)

[poebler]

@markN Hi, Thanks for your help! I tried it - but again with no success!

[livius]

@poebler
one more question. Where you put this code? In boot.py?
If yest - move it to main.py and back withresults.

[poebler]

@livius First i tried it in boot.py - then i moved it to main.py. Both with no success. Then i had an idea. I'm using a FritzBox with Wifi on 2.4 and 5 GHz with the same ssid. I think this is the root cause. I enabled the guest AP and tried to connect to this - and this is working. So at least i have workaround for me! But anyway , thanks a lot for your help!