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为什么会 No HCI buffer is available？

shike wang
Prodigy 190 points


我调用下面的函数， 

stat = ATT_ExchangeMTURsp( connHandle, &msg.exchangeMTURsp );

返回值是4，我查了下是： MSG_BUFFER_NOT_AVAIL: No HCI buffer is available

为什么会有这样的错误？ 

我用的是host模式。