The USB interface on the AsteRx-m2 has a lot going on. There are two ACMs, a mass storage device that enumerates empty by default (like a card reader with no card inserted, to present a volume to the host, set setUMSDOnConnect to true1)), a USB networking interface using the RDNIS driver, a device 'uas' (not sure what that is), and an emulated CD-ROM which contains a copy of the USB driver installer for windows.
The default firmware brings up the USB port as 1.1 which is fine for basic use, but gets bogged down quickly. It can be set to USB 2.0 by uploading AsteRx-m2_USB_2_0.suf at one of the various firmware upload interfaces. It is in asterx-m2-fwp-v4.8.2_0.zip and applying it will cause the unit to reboot.
USB Port dmesg
[877509.836928] usb 3-1: new full-speed USB device number 12 using xhci_hcd
[877509.975570] usb 3-1: New USB device found, idVendor=152a, idProduct=85c0, bcdDevice= 3.14
[877509.975588] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[877509.975594] usb 3-1: Product: Septentrio USB Device
[877509.975599] usb 3-1: Manufacturer: Septentrio
[877509.975603] usb 3-1: SerialNumber: 3245866
[877509.983317] cdc_acm 3-1:1.2: ttyACM0: USB ACM device
[877509.984883] cdc_acm 3-1:1.4: ttyACM1: USB ACM device
[877510.189962] usb-storage 3-1:1.6: USB Mass Storage device detected
[877510.190173] scsi host5: usb-storage 3-1:1.6
[877510.190260] usbcore: registered new interface driver usb-storage
[877510.197000] usbcore: registered new interface driver uas
[877510.201520] usbcore: registered new interface driver cdc_ether
[877510.208448] rndis_host 3-1:1.0 usb0: register 'rndis_host' at usb-0000:00:14.0-1, RNDIS device, 1a:32:02:99:15:45
[877510.208476] usbcore: registered new interface driver rndis_host
[877510.214188] rndis_host 3-1:1.0 enx1a3202991545: renamed from usb0
[877511.206055] scsi 5:0:0:0: CD-ROM Linux File-CD Gadget 0314 PQ: 0 ANSI: 2
[877511.206598] scsi 5:0:0:1: Direct-Access Linux File-CD Gadget 0314 PQ: 0 ANSI: 2
[877511.206959] scsi 5:0:0:0: Attached scsi generic sg2 type 5
[877511.207239] sd 5:0:0:1: Attached scsi generic sg3 type 0
[877511.207663] sd 5:0:0:1: Power-on or device reset occurred
[877511.208232] sd 5:0:0:1: [sdc] Media removed, stopped polling
[877511.208513] sd 5:0:0:1: [sdc] Attached SCSI removable disk
[877511.233639] sr 5:0:0:0: Power-on or device reset occurred
[877511.235212] sr 5:0:0:0: [sr0] scsi-1 drive
[877511.235215] cdrom: Uniform CD-ROM driver Revision: 3.20
[877511.248128] sr 5:0:0:0: Attached scsi CD-ROM sr0
lsusb
Bus 003 Device 012: ID 152a:85c0 Thesycon Systemsoftware & Consulting GmbH Septentrio USB Device
