wlan.ssid()

[Blutkoete]

Hello,

I'm not sure whether this is a bug or if I'm doing or interpreting something wrong (or if there is no way to implement this differently due to hardware/firmware limitations).

The following code was part of my boot.py:

import network
wlan = network.WLAN()
if not (wlan.ssid() == 'mywlanname' and wlan.isconnected()):
    ...

I programmed it this way because machine.reset_cause() wasn't available right from the start, but it always disconnected my telnet session after a soft reset. I didn't give this much thought because I was waiting for the new firmware anyway as I was hit by the write-protection bug, but after modifiying my code to branch based on machine.reset_cause() I noticed that after a soft reset ssid() is reset to the default name starting with lopy-..., but the device is still connected to my WLAN and I can connect to it.

This means that I have no possibility to identify the WLAN that I'm connected to after a soft reset as ssid() returns the default name even if my LoPys are connected to a different network.

Is this a bug, working as intended or a limitation we have to accept?

P.S.: The reason why I'm interested in getting the correct ssid() even after a soft reset is that I'd like to switch WLANs while the LoPy is running but reconnect to the maintenance WLAN after a soft reset, but only if not already connected to the maintenance WLAN to avoid cutting an active telnet connection. If that is not possible it is only a mild annoyance :).

[betabrain]

@daniel Great! You might have to revisit this issue though, see Github. It might have been fixed in the same commit. You know that better than I do.

I also opened a another issue: I would like access to the current BSSID: https://github.com/pycom/pycom-micropython/issues/13

[daniel]

The API will change a bit when we enable AP+STA mode so that you can select the correct interface (the AP or the STA).

[littlebat]

@daniel how is it going to work for AP+STA?

[daniel]

Thanks @betabrain. The problem is fixed, and the solution is already on github.

[betabrain]

@daniel Here you are: https://github.com/pycom/pycom-micropython/issues/12

[daniel]

@betabrain thanks for the bug report. Could you open an issue here: https://github.com/pycom/pycom-micropython ?

Cheers,
Daniel

[betabrain]

It seems as if wlan.ssid() returns the default lopy-wlan-xxxx not just after a reset. I am using version 0.9.4.b1.

from network import WLAN

w = WLAN()
w.ssid() # lopy-wlan-xxxx
w.connect('homewifi', auth=(3, 'secretsecret'), timeout=5000)
w.ssid() # lopy-wlan-xxxx
w = WLAN()
w.ssid() # lopy-wlan-xxxx
w.connect('homewifi', auth=(3, 'secretsecret'), timeout=5000)
w.ssid() # lopy-wlan-xxxx
w = WLAN()
w.ssid() # lopy-wlan-xxxx

Edit: LoPy does connect to homewifi, reliably, but ssid() fails to report that.