1. Check the network connection: Please make sure that your mobile phone or tablet is connected to the Internet and the network connection is normal. You can try switching the network or restarting the router or adjusting the network settings to see if the problem can be solved.
2. Check for application updates: Please ensure that your Feng Tang IOT application has been updated to the latest version. If not, try updating to the latest version, which may fix some known problems.
3. Clear the cache and data: You can try to clear the cache and data of Feng Tang IOT APP in the settings of your mobile phone, and then restart the app to see if it can be used normally.