This is the the doc for LAN client isolation issue with AP mode on LinkIt Smart 7688 temporary solution.
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Factory reset or configure 7688(or 7688 Duo)'s Wi-Fi to AP mode.
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SSH login to 7688(or 7688 Duo)'s shell.
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To reslove by executing below sed command
sed -i 's/"$isolate" = 1/"$isolate" = 0/' '/lib/netifd/wireless/ralink.sh'
- Reload Wi-Fi settings, make the changes take effect.
wifi
- ###=> So Important!! reboot or Unplug and Replug power cable !!!
reboot
- Enjoy it