Problem with /dev/ttyUSB2

[adrianboimvaser]

I have ppp using /dev/ttyS0. Also trying to use /dev/ttyUSB2 for receiving SMS with smstools.
When ppp0 connects I get this in dmesg and /dev/ttyUSB2 goes away:

[   40.330141] usb 1-1.3: USB disconnect, device number 3
[   40.330614] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[   40.330688] option 1-1.3:1.0: device disconnected
[   40.331146] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[   40.331211] option 1-1.3:1.1: device disconnected
[   40.331683] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[   40.331737] option 1-1.3:1.2: device disconnected
[   40.332272] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[   40.332338] option 1-1.3:1.3: device disconnected
[   42.792325] usb 1-1.3: new high-speed USB device number 4 using xhci_hcd
[   42.927658] usb 1-1.3: New USB device found, idVendor=2c7c, idProduct=0700, bcdDevice= 0.00
[   42.927677] usb 1-1.3: New USB device strings: Mfr=3, Product=2, SerialNumber=4
[   42.927694] usb 1-1.3: Product: Quectel LPWA Module
[   42.927710] usb 1-1.3: Manufacturer: Quectel, Incorporated
[   42.927725] usb 1-1.3: SerialNumber: 9e6c63db
[   42.945614] option 1-1.3:1.0: GSM modem (1-port) converter detected
[   42.945979] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB0
[   42.946427] option 1-1.3:1.1: GSM modem (1-port) converter detected
[   42.946749] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB1
[   42.947181] option 1-1.3:1.2: GSM modem (1-port) converter detected
[   42.947492] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB3
[   42.947965] option 1-1.3:1.3: GSM modem (1-port) converter detected
[   42.948286] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB4

This in turn causes errors in smstools like:

GSM1: write_to_modem: error 5: Input/output error

I suspect it's something about calling gpio -g write in the reconnect script.

I've tested swapping the devices and using smstools over /dev/ttyS0 and ppp over /dev/ttyUSB2 and apparently the problem doesn't happen.

[saeedjohar]

Which module with Base HAT or HAT are you using?
Did you try to troubleshoot following the troubleshoot guide?

[adrianboimvaser]

It's a custom HAT built by you based on the cellular IoT HAT I believe.