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数据传输长度问题



GATT_WriteLongCharValue()向从机传输数据的数据长度和GATT_Notification()从机向主机传送数据的长度是不是都是20哈~

我做了几个实验,发现数据从串口传出去后,收到的最多就是20个,是不是我做错了,还是用什么好的方法,求指导~