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usbdongle收到从机发回的字符串,只收到首字符,其余的都收不到,求教



usbdongle只能收到从机发回的字符串中的首字符,而其余的都拿不到,请问怎么回事啊

比如发送的字符串:abcdefg,只能收到一个a,发送字符串:123456,只能收到1

用IOS上位机程序,可以完整收到的!