FC41D how to get state when password incorrect

WIFI/BT
,
1

Hi everyone.FC41D, IS posible get error when wifi password incorrect?
(when use AT+QSTAAPINFODEF or AT+QSTAAPINFO)

2

Hi Sumen,

There will be no explicit error returned when the password is incorrect. However, you can identify this condition by observing the repeated URCs shown below:

[2026-01-22_15:24:57:579]AT+QSTAAPINFO=<ssid>,<password>
[2026-01-22_15:24:57:579]
[2026-01-22_15:24:57:706]OK
[2026-01-22_15:24:59:027]+QSTASTAT:SCAN_NO_AP
[2026-01-22_15:25:05:328]+QSTASTAT:SCAN_NO_AP
[2026-01-22_15:25:11:652]+QSTASTAT:SCAN_NO_AP
[2026-01-22_15:25:17:984]+QSTASTAT:SCAN_NO_AP
[2026-01-22_15:25:24:299]+QSTASTAT:SCAN_NO_AP
[2026-01-22_15:25:30:640]+QSTASTAT:SCAN_NO_AP
[2026-01-22_15:25:36:962]+QSTASTAT:SCAN_NO_AP
[2026-01-22_15:25:43:289]+QSTASTAT:SCAN_NO_AP
[2026-01-22_15:25:49:625]+QSTASTAT:SCAN_NO_AP

If you see the +QSTASTAT:SCAN_NO_AP URC being reported repeatedly, it usually indicates that the authentication has failed, commonly due to an incorrect password.

To further verify, you may use the following command to double-check the SSID of available networks to double confirm the SSID parameter for AT+QSTAAPINFO=<ssid>,<password> :

  • AT+QWSCAN

This allows you to confirm whether the entered SSID is detected by the module and to check the corresponding RSSI of the available access points.

Best regards,
YingCheng

3

Thanks.
Do you have a recommended RSSI value?
for example It might not connect if it’s below -87dBm.
Best regards

4

Regarding your query on the minimum RSSI required for a connection, there isn’t one definitive ‘cutoff’ value because it depends on several environmental and configuration factors, including:

  • Operating Temperature: Extreme heat can increase the noise floor.
  • Modulation & Coding Scheme (MCS): Higher data rates (like 64QAM) require a cleaner signal than lower rates (like BPSK).
  • Wi-Fi Protocol & Bandwidth: For example, 802.11ah HaLow has a much lower sensitivity threshold than standard 2.4GHz Wi-Fi.

As a general guideline for the module acting as a Station (STA) in a 2.4GHz environment under normal temperature (20MHz bandwidth, 2.4G ):

  • For BPSK (lowest data rate, longest range), the sensitivity is approximately -90 dBm.
  • For 64QAM (higher data rate), the requirement is stricter, at approximately -70 dBm.

I have sent you the document for reference through email.

5

Thank you for useful answer.
Best regards