默认EG800AK-CN模块为CDC-ECM。路由模式。已经在系统中正常识别，但是不通通过模块上网，以下是测试记录：上网测试：
2026/01/21: 10:58:16(811): AT+CSQ
2026/01/21: 10:58:16(848): AT+CSQ+CSQ: 24,99
OK
2026/01/21: 10:59:03(977): AT+QLTS
2026/01/21: 10:59:04(016): AT+QLTS+QLTS: “2026/01/21,02:54:53+32,0”
OK
2026/01/21: 10:59:15(267): AT+QNWINFO
2026/01/21: 10:59:15(306): AT+QNWINFO+QNWINFO: “FDD LTE”,“46000”,“LTE BAND 3”,1300
OK
2026/01/21: 10:54:54(300): AT+COPS?
2026/01/21: 10:54:54(328): AT+COPS?+COPS: 0,0,“CHINA MOBILE”,7
OK
网卡模式（路由模式）
2026/01/21: 10:50:28(513): AT+QCFG=“nat”
2026/01/21: 10:50:28(553): AT+QCFG=“nat”+QCFG: “nat”,0
OK
设备识别网卡
usb0 Link encap:Ethernet HWaddr AE:0C:29:A3:9B:6D
inet addr:192.168.43.100 Bcast:192.168.43.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:5 errors:0 dropped:0 overruns:0 frame:0
TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:956 (956.0 B) TX bytes:1368 (1.3 KiB)