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CC2640在发送数据时出现的奇怪问题

Other Parts Discussed in Thread: CC2640

CC2640使用notify方式发送一个20Byte字符串,速度很慢,使用sniffer抓包后,发现20Byte居然分成2个包发送,如下图:

我发送的字符串是“01234567890123456789”,它把前11个字符+9个未知字符“30 42 1D 91 3F 8C 66 02 10 D0”凑成20个字节给发了出去,

然后又把剩余的9个字节在第二个事件中发了出去。

请教TI工程师为何会出现如此奇景?百思不得其解!