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CC2640R2 Characteristic问题

我设置一个具有可读可写属性的Characteristic,其Value为20 个字节的数组。当我主机写不满20个字节时,写入从机的值后面就会随意添加字符,请问是咋回事呢?

如下是我从机Uart打印出来的数据,我写入123,打印出来如下图: