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如果我没记错的话, l2ping用于对连接的 BLE(蓝牙低功耗)外围设备执行 L2CAP 回显请求(请参阅 l2ping源代码)。如果我尝试 ping 我的智能手机,它就可以工作,但如果我尝试 ping BLE 外围设备,它就不行。