请问：我现在用cc2640的2.2.1协议栈，发现用GATT_Notification（）函数发送数据只能发20字节以内，大于20字节就发送不成功，是哪里没用对呢？不是说ble 2.2.1的协议栈可以发送最大251字节的用户数据吗？
我看到有个#define MAX_PDU_SIZE 27的宏了，但我现在只发21字节就不行了，发20字节还是可以的。
请指点一下了，谢谢！
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