The Apple terminal will automatically disconnect Wi-Fi after the screen is turned off

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After collecting debugging information and air interface packet capture information analysis on the AC, it is found that the Apple terminal will actively send a disassociation message after the screen is turned off, that is, actively disconnect the wireless connection. However, the wireless will not be disconnected when the power is plugged in for charging, and it is judged as a terminal power saving mechanism, which cannot be solved on the device side.