63ef0990b65a46b56707e6f28534e0e01bc4e22c

Most Sierra PPP-based devices are supposed to allow PPP on the APP1 port, which has a dumb AT parser, leaving the main port (with the intelligent AT parser) free for status and signal strength. But out of all the devices I've tested it with (8775, 8781, AC881, and C885), only the C885 actually works. The rest (including three different firmware versions for the 8775) either crash or disconnect shortly after PPP starts. To help figure out which devices actually support this, when running MM in debug mode, users can set the MM_SIERRA_APP1_PPP_OK environment variable and assume the APP1 port allows PPP. This is only for debugging purposes.
license: use GPLv2 as top level COPYING for now to reflect the license actually used by source files
ModemManager. The problem ModemManager tries to solve is to provide a unified high level API for communicating with (mobile broadband) modems. While the basic commands are standardized, the more advanced operations (like signal quality monitoring while connected) varies a lot. Using. ModemManager is a system daemon and is not meant to be used directly from the command line. However, since it provides DBus API, it is possible to use 'dbus-send' command to control it from the terminal. There's an example program (tests/mm-test.py) that demonstrates the basic API usage. Implementation. ModemManager is a DBus system bus activated service (meaning it's started automatically when a request arrives). It is written in C. The devices are queried from udev and automatically updated based on hardware events. There's a GInterface (MMModem) that defines the modem interface and any device specific implementation must implement it. There are two generic MMModem implementations to support the basic operations (one for GSM, one for CDMA,) which are common for all cards. 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 MMModem 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's a fully working plugin in the plugins/ directory for Huawei cards that can be used as an example for writing new plugins. Writing new plugins is highly encouraged! API. The 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!
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