Through wpa_supplicant fixed connection to one of hot spots, if this hot spot open, can normal connection, but if there is no hot, open the wpa_supplicant will always run, ask how can I make wpa_supplicant connection for a period of time no connection is successful, shut down automatically,

Root @ imx6qsabresd:/topeet#./usb_wifi_8723bu topeet_8723bu_wapstart. Conf CQJL 12345678
Root @ imx6qsabresd:/topeet# Successfully initialized wpa_supplicant
IPv6: ADDRCONF (NETDEV_UP) : wlan0: the link is not ready
RTL871X: nolinked power save leave
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RTL871X: nolinked power save leave
RTL871X: nolinked power save enter
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RTL871X: nolinked power save enter
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RTL871X: nolinked power save enter
RTL871X: nolinked power save leave
RTL871X: nolinked power save enter
RTL871X: nolinked power save leave
RTL871X: nolinked power save enter
RTL871X: nolinked power save leave
RTL871X: nolinked power save enter
RTL871X: nolinked power save leave
RTL871X: nolinked power save enter
RTL871X: nolinked power save leave
RTL871X: nolinked power save enter
RTL871X: nolinked power save leave
RTL871X: nolinked power save enter
RTL871X: nolinked power save leave
RTL871X: nolinked power save enter
RTL871X: nolinked power save leave