An in-development library for interfacing with USB 3G/HSDPA/UMTS modems (particularly Huawei ones, like the E220 and E3531 models) that use the Hayes/AT command set.
Some basic functionality is starting to take shape - presently, the library can send and decode GSM 7-bit and UCS-2 SMSes, using the SMS PDU format. However, everything is still in flux at this stage. As such, documentation is a bit sparse, since there's no point documenting something that's going to change the day after you document it. This will change when things settle down...!
Licensed under CC0.