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Sniff SSID

Michael Ingraham 2019-09-30 10:09:20 -04:00
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FAQ.md

@ -97,26 +97,34 @@ With some Wi-Fi routers (i.e. Linksys with DD-WRT), you may have conflicts with
DD-WRT also has Wi-Fi Multi-Media (WMM) enabled by default. Disabling WMM can resolve connectivity issues.
### I entered the wrong Wi-Fi information
If you have a device with a button and it is configured as a component in the Tasmota settings, you can try pressing the button to force the device into [Wi-Fi configuration mode](Button-usage#4-short-presses) with 4 short presses of the button.
- If you have a device with a button and the button is configured as a component in the Tasmota settings (e.g., GPIO0 - Button1), you can try pressing the button to force the device into [Wi-Fi configuration mode](Button-usage#4-short-presses) with 4 short presses of the button.
If you flashed a light bulb or any device without a built-in button and entered wrong Wi-Fi password you now have a device that won't connect to your Wi-Fi and you have no button to force it into Wi-Fi configuration mode.
- If you flashed a light bulb or any device without a built-in button and entered wrong Wi-Fi password you now have a device that won't connect to your Wi-Fi and you have no button to force it into Wi-Fi configuration mode.
To solve this you can try creating a new Wi-Fi AP with the same SSID and no (none) authentication. Use an old router, a mobile phone or, if you're desperate, change the settings on your main router (but remember to turn authentication back on when you're done. Depending on the router/phone it will ignore the wrong Wi-Fi password since authentication is set to none and let your Tasmota flashed device connect to it.
To solve this you can try creating a new Wi-Fi AP with the same SSID and no (none) authentication. Use an old router, a mobile phone or, if you're desperate, change the settings on your main router (but remember to turn authentication back on when you're done). Depending on the router/phone it will ignore the wrong Wi-Fi password since authentication is set to none and let your Tasmota flashed device connect to it.
Now simply connect to the same AP and open the web UI, triple check your ssid and password, enter some simple info for `SSID2` which you can create as a hotspot on your phone and save.
Now simply connect to the same AP and open the web UI, triple check your ssid and password, enter some simple info for `SSID2` which you can create as a hotspot on your phone and save.
If you are unsure what SSID you have entered, you can try to find that with special Wi-Fi sniffing tools. For example [Nirsoft WifiChannelMonitor](https://www.nirsoft.net/utils/wifi_channel_monitor.html) can show your mistakenly configured SSID name.
- If you are unsure what SSID you have entered, you can try to find that with special Wi-Fi sniffing tools. For example [Nirsoft WifiChannelMonitor](https://www.nirsoft.net/utils/wifi_channel_monitor.html) can show your mistakenly configured SSID name.
**Linux system example:**
```
apt install aircrack-ng wireshark
airmon-ng check kill
airmon-ng start (e.g. wlp58s0 or wlan0)
wireshark
```
Select your Wi-Fi device from the list. Plug in the mis-configured device and immediately watch SSIDs. You should see your mis-configured SSID fairly soon.
If these methods don't work, it may still be possible to save the device without opening it to perform a serial flash. Since Tasmota uses GET request for forms, the password may be in your browser history.
1. Search in your browser history for 192.168.4.1 (or whatever address you used for configuring it)
2. There should be an entry similar to this:
`http://192.168.4.1/wi?s1=<mySSID>&p1=<myPassword>-********&s2=&p2=********&h=hostName&save=`
- `s1` is your first AP SSID
- `p1` is the first AP password
- `s2` and `p2` are the same parameters but for the second AP
- `h` is the hostname given to the device by the Tasmota configuration
3. After getting the incorrectly entered configuration from this URL, configure an access point with these settings as described above
4. Access your device and set the correct Wi-Fi credentials
- If these methods don't work, it may still be possible to save the device without opening it to perform a serial flash. Since Tasmota uses GET request for forms, the password may be in your browser history.
1. Search in your browser history for 192.168.4.1 (or whatever address you used for configuring it)
2. There should be an entry similar to this:
`http://192.168.4.1/wi?s1=<mySSID>&p1=<myPassword>-********&s2=&p2=********&h=hostName&save=`
- `s1` is your first AP SSID
- `p1` is the first AP password
- `s2` and `p2` are the same parameters but for the second AP
- `h` is the hostname given to the device by the Tasmota configuration
3. After getting the incorrectly entered configuration from this URL, configure an access point with these settings as described above
4. Access your device and set the correct Wi-Fi credentials
### Device disconnects from Wi-Fi often