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开发板跑WLAN_Station的Demo有下面的错误

Other Parts Discussed in Thread: CC3200

一开始能够连接wifi,可是过了一会儿就掉线了,这是什么原因呢?

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CC3200 WLAN STATION Application
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Host Driver Version: 1.0.0.1
Build Version 2.2.0.1.31.1.2.0.2.1.0.3.23
Device is configured in default state
Device started as STATION
[WLAN EVENT] STA Connected to the AP: WiFiaa ,BSSID: 58:94:6b:d8:c1:41
[NETAPP EVENT] IP Acquired: IP=192.168.155.3 , Gateway=192.168.155.1
Connection established w/ AP and IP is aquired
Pinging...!
Error [-2000] at line [667] in function [CheckLanConnection]
Device couldn't ping the gateway
[WLAN ERROR]Device disconnected from the AP AP: WiFiaa,BSSID: 58:94:6b:d8:c1:41 on an ERROR..!!