b4dcb76d5a
Until now we had only a 2500ms timeout initialized since the first port was exposed until we decided we were ready to consider all ports notified by the kernel. With this new logic, we add an additional condition: even if the 2500ms initial timeout has elapsed already, we leave an additional 1500ms since the last port addition for new ports to appear. This new logic is useful when relying on the ReportKernelEvent() DBus method, as it is the user the one responsible for reporting the kernel events instead of udev. Now, the user is not forced to make sure all ports are exposed in 2500ms; instead, we also allow ports to be reported in more than 2500ms as long as the time between port additions reported is less than 1500ms. Note that this does not mean that the whole probing time will now always be 4000ms. On well behaved systems (like when based on udev) this new 'extra' probing timeout may expire long before the 'min' probing timeout we already had as well. E.g. in this setup, the reporting of the NET port was done 1100ms later than the last ttyUSB3, and that was already too late as the original 2500ms threshold had already expired. [1573536994.593874] (tty/ttyUSB0): first port in device /sys/devices/platform/ehci-platform/usb1/1-1 [1573536994.596659] [plugin manager] task 1: port grabbed: ttyUSB0 [1573536995.093579] (tty/ttyUSB1): additional port in device /sys/devices/platform/ehci-platform/usb1/1-1 [1573536995.094172] [plugin manager] task 1: port grabbed: ttyUSB1 [1573536995.603206] (tty/ttyUSB2): additional port in device /sys/devices/platform/ehci-platform/usb1/1-1 [1573536995.603822] [plugin manager] task 1: port grabbed: ttyUSB2 [1573536996.111564] (tty/ttyUSB3): additional port in device /sys/devices/platform/ehci-platform/usb1/1-1 [1573536996.112257] [plugin manager] task 1: port grabbed: ttyUSB3 [1573536996.814816] [device /sys/devices/platform/ehci-platform/usb1/1-1] creating modem with plugin 'Quectel' and '4' ports [1573536997.265820] (net/wwan0): additional port in device /sys/devices/platform/ehci-platform/usb1/1-1 [1573536997.296935] (usbmisc/cdc-wdm0): additional port in device /sys/devices/platform/ehci-platform/usb1/1-1
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 provide 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+.