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Cannot connect smart thermostat relay to TPLINK RE305 4.0

Cannot connect smart thermostat relay to TPLINK RE305 4.0

Cannot connect smart thermostat relay to TPLINK RE305 4.0
Cannot connect smart thermostat relay to TPLINK RE305 4.0
2025-10-31 13:54:53 - last edited 3 weeks ago
Model: RE305  
Hardware Version: V4
Firmware Version: 1.0.50 Build 250821 Rel.58303n (6985)

Hello,

 

Connecting a smart thermostat (Netatmo) to the RE305 seems impossible for me. During the installation of the thermostat inside the Netatmo Energy application, I select my extended network, enter the password and then after a while the app says "Wrong password", this also happen when the RE305 is set the AP mode. I'm sure that the password is good, because :

 

* I can connect smartphones and laptops to the RE305 using the password successfully

* I can connect the smart thermostat to an old phone emitting an AP

 

The RE405 V4.0 use the last firmware : 1.0.50 Build 250821 Rel.58303n (6985). The RE305 extend a 2.4GHz network, SSID is different than my main network.

 

There's only one thing I have some doubt : the security mode is set to WPA/WPA2-Personal and I read that Netatmo don't like mixed mode but only WPA2-PSK. This option is not available on the RE305 webUI.

 

Any solution instead of buying a new extender not from TPLink ?

 

Thank you.

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#1
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1 Accepted Solution
Re:Cannot connect smart thermostat relay to TPLINK RE305 4.0-Solution
3 weeks ago - last edited 3 weeks ago

  @woozle Hello,

 

After trying the "WPA2/WPA3-Personal" setting I have the same problem. I even tried the "WPA3" only setting.

So I ended by activating a separate network of my main router, set the extended network with no security connect the Netatmo relay and then hide the SSID broadcast from the TPLink. Not a good practice but I don't want to buy another network extender for a simple bug.

 

Also, during the WIFI configuration on the Netatmo app, when selecting the extended network without security the app ask for a password. You cannot enter a blank password, so enter anything else and it will work.

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#4
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4 Reply
Re:Cannot connect smart thermostat relay to TPLINK RE305 4.0
2025-10-31 16:25:08 - last edited 3 weeks ago

  @Dlazzy 

 

Hi,

 

Have you already tried "WPA2/WPA3-Personal" instead of "WPA/WPA2-Personal"?

 

Also make sure that during initial installation the device running the Netatmo app is connected to the same Wi-Fi network that is to be used for the thermostat. (i.e. the 2.4 GHz network of the RE305)

 

Other than that I can't think of anything else that could be done.

 

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#2
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Re:Cannot connect smart thermostat relay to TPLINK RE305 4.0
2025-11-10 11:08:18 - last edited 3 weeks ago

  @woozle hello,

 

Thanks for you reply. I'll try with WPA2/WPA3-Personal and let you know if I have a success or not.

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#3
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Re:Cannot connect smart thermostat relay to TPLINK RE305 4.0-Solution
3 weeks ago - last edited 3 weeks ago

  @woozle Hello,

 

After trying the "WPA2/WPA3-Personal" setting I have the same problem. I even tried the "WPA3" only setting.

So I ended by activating a separate network of my main router, set the extended network with no security connect the Netatmo relay and then hide the SSID broadcast from the TPLink. Not a good practice but I don't want to buy another network extender for a simple bug.

 

Also, during the WIFI configuration on the Netatmo app, when selecting the extended network without security the app ask for a password. You cannot enter a blank password, so enter anything else and it will work.

Recommended Solution
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#4
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Re:Cannot connect smart thermostat relay to TPLINK RE305 4.0
3 weeks ago

Hello@Dlazzy ,

Thank you for sharing your final solution. I believe it will be very helpful to other users with similar needs.

The RE305 can improve WiFi coverage, it is recommended that you use it to provide network access for other devices.

Nice to Meet You in Our TP-Link Community. Check Out the Latest Posts: △Pre-release Firmware for Archer AX50 Introduces New Parental Control Features and Enhancements △Introducing AI QoS: Elevate Your Gaming Experience on the Archer GE800 Gaming Router △Connect TP-Link Archer BE550 to Germany's DS-Lite (Dual Stack Lite) Internet via WAN △Tether KidShield Test Recruitment - Safeguarding Children's Online Experience If you found the post or response helpful, please click Helpful. If an answer solves your problem, click "Recommended Solution" so that others can benefit from it.
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