Ben Chan
e8bac6cb92
Depsite 3GPP TS 23.038 specifies that Unicode SMS messages are encoded in UCS-2, UTF-16 encoding is commonly used instead on many modern platforms to allow encoding code points that fall outside the Basic Multilingual Plane (BMP), such as Emoji. Most of the UCS-2 code points are identical to their equivalent UTF-16 code points. In UTF-16, non-BMP code points are encoded in a pair of surrogate code points (i.e. a high surrogate in 0xD800..0xDBFF, followed by a low surrogate in 0xDC00..0xDFFF). An isolated surrogate code point has no general interpretation in UTF-16, but could be a valid (though unmapped) code point in UCS-2. This patch modifies the 3GPP SMS decoding to first try UTF-16BE and then fall back to UCS-2BE on failure. If both fail, an empty string is returned instead of a NULL pointer.
ModemManager. ModemManager provides a unified high level API for communicating with mobile broadband modems, regardless of the protocol used to communicate with the actual device (Generic AT, vendor-specific AT, QCDM, QMI, MBIM...). Using. ModemManager is a system daemon and is not meant to be used directly from the command line. However, since it provides a DBus API, it is possible to use 'dbus-send' commands or the new 'mmcli' command line interface to control it from the terminal. The devices are queried from udev and automatically updated based on hardware events, although a manual re-scan can also be requested to look for RS232 modems. Implementation. ModemManager is a DBus system bus activated service (meaning it's started automatically when a request arrives). It is written in C, using glib and gio. Several GInterfaces specify different features that the modems support, including the generic MMIfaceModem3gpp and MMIfaceModemCdma which provice basic operations for 3GPP (GSM, UMTS, LTE) or CDMA (CDMA1x, EV-DO) modems. If a given feature is not available in the modem, the specific interface will not be exported in DBus. Plugins. Plugins are loaded on startup, and must implement the MMPlugin interface. It consists of a couple of methods which tell the daemon whether the plugin supports a port and to create custom MMBroadbandModem implementations. It most likely makes sense to derive custom modem implementations from one of the generic classes and just add (or override) operations which are not standard. There are multiple fully working plugins in the plugins/ directory that can be used as an example for writing new plugins. Writing new plugins is highly encouraged! The plugin API is open for changes, so if you're writing a plugin and need to add or change some public method, feel free to suggest it! License. The ModemManager and mmcli binaries are both GPLv2+. The libmm-glib library is LGPLv2+.