# Unable to join to wifi network for the second time
**URL:** https://forum.sensor.community/t/unable-to-join-to-wifi-network-for-the-second-time/4405
**Category:** FAQ
**Created:** [February 11, 2025, 7:54am UTC](https://forum.sensor.community/t/unable-to-join-to-wifi-network-for-the-second-time/4405 "2025-02-11T07:54:32Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@hrubog](https://forum.sensor.community/u/hrubog)
#### Post date: [February 11, 2025, 7:54am UTC](https://forum.sensor.community/t/unable-to-join-to-wifi-network-for-the-second-time/4405/1 "2025-02-11T07:54:32Z")
Hi!
I ordered a kit with NodeMCU and SDS011 and following the guide I was able to set it up successfully, it already appeared under my devices and on the map, with incoming data.
Then I decided I want to send data to a third party API, so I unplugged the sensor, waited for it to restart, and wanted to set up wifi connection + custom API, but ever since I am unable to even join the wifi network. It connects for a short while (I can see it on the router’s admin page), then disconnect. The sensor’s network in the meantime is always visible (airRohr-).
Can anyone provide some help?
Thanks in advance,
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### Author:  [@pjg](https://forum.sensor.community/u/pjg)
#### Post date: [February 11, 2025, 11:07am UTC](https://forum.sensor.community/t/unable-to-join-to-wifi-network-for-the-second-time/4405/2 "2025-02-11T11:07:26Z")
Welcome !
Are you sure you want to connect the right way. YOu should be able to access the sensor through the router on an adresse 192.168.1.\<100 or something\>. Check the DHCP client list of the router.
If you keep seeing the AirRohr-… network it means you are not connected to your router at all. And you have only 10 minutes to connect because of security reason. Please read the instructions attentively.
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### Author:  [@hrubog](https://forum.sensor.community/u/hrubog)
#### Post date: [February 11, 2025, 4:29pm UTC](https://forum.sensor.community/t/unable-to-join-to-wifi-network-for-the-second-time/4405/3 "2025-02-11T16:29:48Z")
Thanks for the reply!
As I also have no idea what’s going wrong I tried debugging a bit. It would be most useful to see the logs, but I haven’t managed to make it work as the [flashtool](https://github.com/opendata-stuttgart/airrohr-firmware-flasher//) documentation seems a bit outdated (driver link for the NodeMCU is broken). Do you have any tips on debug tools?
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### Author:  [@fredvduin](https://forum.sensor.community/u/fredvduin)
#### Post date: [February 11, 2025, 8:36pm UTC](https://forum.sensor.community/t/unable-to-join-to-wifi-network-for-the-second-time/4405/4 "2025-02-11T20:36:53Z")
Try to read the (USB) serial with putty
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### Author:  [@pjg](https://forum.sensor.community/u/pjg)
#### Post date: [February 12, 2025, 7:18am UTC](https://forum.sensor.community/t/unable-to-join-to-wifi-network-for-the-second-time/4405/5 "2025-02-12T07:18:40Z")
Or with the Arduino IDE.
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### Author:  [@hrubog](https://forum.sensor.community/u/hrubog)
#### Post date: [February 13, 2025, 3:03pm UTC](https://forum.sensor.community/t/unable-to-join-to-wifi-network-for-the-second-time/4405/6 "2025-02-13T15:03:48Z")
It worked out, thanks for the responses. I checked the logs with Putty and it was unable to connect to the wifi. Interestingly, after a wifi network restart it worked again. ¯\_(ツ)_/¯
One more follow up question: what is the easiest way to change the sensor configuration (connect to a different wifi, send data to a different custom API, etc.)? Without having to disconnect and wait for it to forget the config
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### Author:  [@pjg](https://forum.sensor.community/u/pjg)
#### Post date: [February 13, 2025, 6:42pm UTC](https://forum.sensor.community/t/unable-to-join-to-wifi-network-for-the-second-time/4405/7 "2025-02-13T18:42:47Z")
Connect through the router and change the config.