目前手头买了70片的EC200A-CN 4G模组，如何测试他的连通性？
sim卡插了，模块也上电使能了，但是ping www.baidu.com ping 5个包，全部丢到。如何去测试，这些模块插到我们的板子上是通的，可用的，功能正常的？
lwtech@Debian-LW:~$
lwtech@Debian-LW:~$ sudo EC200A_CTRL.sh UP
[sudo] password for lwtech:
[EC200A power_on_module:121]:Device is up.
[EC200A cleanup:19]:Cleanup lockfile.
[EC200A cleanup:19]:Cleanup lockfile.
lwtech@Debian-LW:~$ ping www.baidu.com -I usb0 -c 5
PING www.a.shifen.com (220.181.38.150) from 192.168.43.100 usb0: 56(84) bytes of data.
— www.a.shifen.com ping statistics —
5 packets transmitted, 0 received, 100% packet loss, time 4066ms
lwtech@Debian-LW:~$