异常信息：[ERROR:bta_gattc_utils.cc(458)] bta_gattc_mark_bg_conn unable to find the bg connection mask for bd_addr=00:a0:50:c1:67:51
解决： 手机蓝牙死了 ，手机重启
ble 多次断开 然后搜索连接,就是连接不上
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