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如题，Peripheral程序运行时，怎样获取当前的MTU值？
存在这种情况，与主机建立连接后，主机会更新从机的MTU，所以我需要获取到当前的MTU值。
我找到答案了。
这是怎么个情况？咋还不支持这个函数呢？
