2020-12-23 1.调整mqtt挤下线，跑ui线程。2.LoadEvent_CheckLinkStatus方法调整

JLChen

2020-12-23 f9f9b0030fdd2691632569b7dcad9d0ddca5e4cf

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<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
    <base-config cleartextTrafficPermitted="true"/>
</network-security-config>