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The purpose of wln_rescan() is to help you find out if there is an access point in range that has a "better signal". This function starts the process, which then proceeds in the background without stalling your application. Once the scanning is finished, callback_wln_rescan_result() is called.
If several access points with the same SSID are in range, callback_wln_rescan_result() will return the signal strength for the access point with the strongest signal.
You can't use this function before calling wln_start().