我有一个蓝牙终端，一直在发数据，用手机连接可以接收到数据，但是用开发板能够与设备连接，能打开SPP端口，但是读取数据长度为0，这是什么情况呢？
还有，低功耗蓝牙设备可以被传统蓝牙设备搜索到并连接吗？
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