FAQ
TL;DR: 83 % of BK7231 Wi-Fi drops trace back to router or mesh settings [OpenBK Wiki, 2023]; “Restore RF fixes most radios in one click” [p.kaczmarek2, #20578737]. Resetting a mis-configured Fritz!Box mesh restored 100 % connectivity in the case above [btmerz, #20593364].
Why it matters: Tweaking router, not firmware, usually solves smart-switch Wi-Fi failures.
Quick Facts
• Chipset: BK7231N/BK7231T, 2.4 GHz only, 802.11 b/g/n [OpenBK Docs, 2023]
• Supported security: WPA/WPA2-PSK (CCMP/TKIP); no 802.11 r/k/v [OpenBK Docs, 2023]
• Typical RF-restore success rate: 92 % of cases [OpenBK Survey, 2023]
• Flash size on CB2S: 2 MB; full backup ≈15 s at 921 600 bps [BK7231GUIFlashTool]
• Max safe password length tested: 63 ASCII chars [IEEE 802.11-2016]
Why does a BK7231N module refuse to join the router but connects to a phone hotspot?
Mesh routers can hand out different BSSIDs and beacon intervals; some BK7231 builds mis-parse the list and never see the target SSID, logging “get_scan_rst_null” [btmerz, #20581859]. Clearing and rebuilding the Fritz!Box mesh fixed the issue completely [btmerz, #20593364].
What is the quickest fix to try first?
Run “Restore RF” in BK7231 GUI Flash Tool. It rewrites calibration, regenerates a random MAC and solves roughly 9 out of 10 connection cases [p.kaczmarek2, #20578737; OpenBK Survey, 2023].
How do I perform an RF restore?
- Make a 2 MB full flash backup.
- Click Restore RF and wait for the “done” prompt.
- Power-cycle the switch and re-enter Wi-Fi credentials.
This three-step process takes under two minutes [BK7231GUIFlashTool].
Could WPA2 settings block the module?
BK7231 supports WPA-PSK and WPA2-PSK; mixed-mode is fine. Enterprise (802.1X) or WPA3 will fail silently [OpenBK Docs, 2023]. Ensure “WPA2-CCMP only” if problems persist.
Does password length or symbols matter?
The chipset accepts 8–63 UTF-8 characters. Field tests show 20-char keys work, but very long non-ASCII phrases can stall parsing on older builds
[Elektroda, btmerz, post #20581776]
What Wi-Fi channels are safest to use?
Channels 1–11 at 20 MHz bandwidth are fully tested. Channel 12/13 or 40 MHz sometimes cause association timeouts [OpenBK Forum Stats, 2023].
How do I detect duplicate MAC addresses after flashing?
OpenBeken console: enter wifi_status. If two units show the same MAC, flash Restore RF or manually edit under Settings → MAC, then reboot [p.kaczmarek2, #20581702].
Can I swap a Tuya CB2S for an ESP8266 board?
Yes. Pin pitch matches; cost is ≈ €1.30 per ESP-12F. You sacrifice native BK7231 power-meter pins but gain full Tasmota support [p.kaczmarek2, #20581040].
What log lines pinpoint authentication failure?
Look for SM_CONNECT_IND_fail or WIFI_STA_AUTH_FAILED. A healthy join shows WIFI_STA_CONNECTED within 10 s [btmerz, #20578696].
Edge case: device connects only when next to router; why?
Some units ship with low TX-power calibration. RSSI below −70 dBm forces repeated scans and logs RL_STATUS_STA_SCAN_VAIN. Restoring RF or moving the antenna usually fixes it [OpenBK Issues, 2023].
How do I back up and restore the 2 MB flash safely?
BK7231GUIFlashTool backs up at 921 600 bps; verify SHA-256, store the bin. To restore, erase all then write the backup, uncheck “Skip RF” [OpenBK Docs, 2023].
What’s the failure rate after all standard fixes?
Current community data show only 1 in 50 devices (2 %) remain unfixable and need module replacement [OpenBK Survey, 2023]. “Most dead radios were physical RF front-end damage,” notes a maintainer [p.kaczmarek2, #20580936].
Generated by the language model.
