I did some testing. Basically, it works. The device is a ZTE MF79U CAT4-4G Modem. It is designed to be a mobile WiFi access point, so by default it creates a 2.4 GHz WLAN for WiFi clients, which also provides an admin web interface for the device.
Additionally, it has a slot for a microSDHC card that shows up as sd1 in my case. And it has 2 TS9 sockets for external antennas - I have a dual 4G/5G antenna connected with SMA/TS9 adapters. When the device gets plugged in, it shows up like this in dmesg: umass0 at uhub0 port 2 configuration 1 interface 0 "ZTE,Incorporated ZTE Mobile Boardband" rev 2.00/58.86 addr 6 umass0: using SCSI over Bulk-Only scsibus4 at umass0: 2 targets, initiator 0 cd0 at scsibus4 targ 1 lun 0: <ZTE USB, SCSI CD-ROM 2.31, > removable sd1 at scsibus4 targ 1 lun 1: <ZTE MMC, Storage 2.31, > removable No network interface on the OpenBSD host yet at this point. By default, you need to use the admin web interface to enter the SIM PIN before the device can connect to mobile broadband. Connect to the device WLAN (ZTE_something, WPA key on sticker in the device), browse to http://192.168.0.1/, user "admin", password on sticker in the device. You will be asked to enter the SIM PIN. A moment later, the device goes like this in dmesg: cdce0 at uhub0 port 2 configuration 1 interface 0 "ZTE,Incorporated ZTE Mobile Boardband" rev 2.00/58.86 addr 6 cdce0: address fe:e1:ba:d0:94:75 umass0 at uhub0 port 2 configuration 1 interface 2 "ZTE,Incorporated ZTE Mobile Boardband" rev 2.00/58.86 addr 6 umass0: using SCSI over Bulk-Only scsibus4 at umass0: 2 targets, initiator 0 cd0 at scsibus4 targ 1 lun 0: <ZTE USB, SCSI CD-ROM 2.31, > removable sd1 at scsibus4 targ 1 lun 1: <ZTE MMC, Storage 2.31, > removable sd1: 15200MB, 512 bytes/sector, 31129600 sectors Where sd1 is the microSDHC card in the device, and cdce0 is a network interface that can be started like this: # ifconfig cdce0 autoconf # ifconfig cdce0 cdce0: flags=808943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST,AUTOCONF4> mtu 1500 lladdr fe:e1:ba:d0:94:75 index 7 priority 0 llprio 3 groups: egress inet 192.168.0.16 netmask 0xffffff00 broadcast 192.168.0.255 I did some light browsing, pinging etc. Things were working as expected. I did not do heavier testing yet. Unlike umb(4) devices, the APN string and SIM PIN cannot be set from ifconfig. At least for initial setup, the device web admin interface has to be used. But changed settings there should be persistent. For my use case (DSL backup over LTE), SIM PIN checking needs to be disabled, so I won't have to use the admin interface every time to manually start the broadband connection. And WiFi from the device will be disabled - the DSL router provides WiFi already, less radio noise, and 192.168.0.1 could be reached from the OpenBSD host. This can be set in the web interface. Not tested yet, but I don't expect problems. Works for me, so far. Olaf
