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BLE FR801XH(从机)与手机（主机）配对、绑定后，绑定信息被存于 flash 中（起始地址 0x7d000）,当手机再次连接时，BLE便可识别该手机已绑定。问题：如何确定当前连接的手机对应保存在flash中的绑定信息中的device_idx？
这个你需要做一个索引记录一下mac对应哪个手机