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cc3220s-launchxl 开发板使用官方mqtt-client demo程序无法连接ap

如题,使用官方mqtt-client tirtos例子,仅仅更改network-if.h中ssid 和key.不管写什么ssid,串口均输出counld not connect to SSID ...红灯一直闪烁

而是用iphone 8 plus , ipad air 2连接这种ap没有任何问题。请问一下这个板子是不是有问题?