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ppp_recv_entry中的PPP_STATE_PREPARE下,丢掉脏数据的处理不合理 #26

@denghengli

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@denghengli
    if (device->state == PPP_STATE_PREPARE)
    {
            ......
            /* throw away the dirty data in the uart buffer */
            rt_device_read(device->uart, 0, buffer, PPP_RECV_READ_MAX);
            .....
    }

在ppp_recv_entry中,模块拨号成功后,加了清理脏数据处理。如果真有脏的数据,这样最多也只能清理掉PPP_RECV_READ_MAX(32字节)长度的数据吧,如果RT_SERIAL_RB_BUFSZ比PPP_RECV_READ_MAX大,是清理不干净的

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