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如下图所示，说特征值的权限是由特征值声明来确定的，那特征值中的permissions就是GATT_PERMIT_READ | GATT_PERMIT_WRITE, 这个又有什么用呢
说明了权限，可读可写 ，notify等。
请看下面的文章有解释：
dev.ti.com/.../node
