Teltonika Modems enable internet connection using GSM, 3G or LTE networks. They run OpenWrt based, feature rich, open source firmware.
Command Line Interface (CLI)
Modem can be accessed via command line interface (CLI)
Communicate with the modem via gsmctl
$ gsmctl -h
To see options.
Tip: gsmctl also enables sending Hayes AT commands to the modem.
SMS can be sent with gsmctl
Tip: As mobile data often is limited, to monitor data usage VnStat is a good option.