http://www.linux-databook.info/?page_id=3748
systemctl disable ModemManager.service 失能ModemManger从而取消对4G模块的ttyUSB口复位的占用
http://www.linux-databook.info/?page_id=3748
systemctl disable ModemManager.service 失能ModemManger从而取消对4G模块的ttyUSB口复位的占用
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