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On OpenWRT devices, we use QUECTEL EC25-E GSM Module, internet is disconnecting, when it disconnect we send AT+CFUN=1,1 to GSM Modem. Before send command devices are;

crw-------    1 root     root      188,   0 Jun 27 15:35 /dev/ttyUSB0
crw-------    1 root     root      188,   1 Jun 27 15:35 /dev/ttyUSB1
crw-------    1 root     root      188,   2 Jun 27 15:35 /dev/ttyUSB2
crw-------    1 root     root      188,   3 Jun 27 15:35 /dev/ttyUSB3

After I send command

crw-------    1 root     root      188,   0 Jun 27 15:39 /dev/ttyUSB0
crw-------    1 root     root      188,   2 Jun 27 17:46 /dev/ttyUSB2
crw-------    1 root     root      188,   3 Jun 27 15:39 /dev/ttyUSB3
crw-------    1 root     root      188,   4 Jun 27 15:39 /dev/ttyUSB4

devices are changing, it results internet cannot be connected.

Is there a way to prevent?

FSA
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  • Did you tried using udev rule to link specific usb device(vendor id, product id) to specific symlink? For example https://stackoverflow.com/a/48356358/6273349 – stenliis Jul 07 '20 at 14:18
  • @FSA is this still an issue for you? Have you investigated whether using a different `ttyUSB*` interface gets things working again? – Attie Dec 14 '20 at 10:35
  • I solved issue, If I send command bind, unbind it solves it. Thanks. – FSA Jan 27 '21 at 17:29

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