Hey Artur, > I am wondering if I may get some insight on the GPS refresh rate. When I > change the rate from the default 30 seconds to say, 5, the utc timestamp on > the nmea string does not change. When I disable the location gathering and > re-enable it the timestamp updates once. Seems like the refresh rate is not > being honored. I do realize that the ModemManager from the debian > repositories is old. Would I need to update it manually to fix the GPS > refresh rate? > > Does the modem need to be moving physically and not be stationary for the GPS > location time to update? > > Distro: Debian Buster 10.7 (Vanilla) > Modem: Sierra Wireless EM7455 (latest generic firmware) > Modem Manager Version: 1.10.0 > MetworkManager: 1.14.6 >
This issue has nothing to do with the MM version in use, I'm afraid. The problem is that what you're configuring in MM is not really what you're assuming it's being configured :) The "SetGpsRefreshRate()" method configures how often the GPS information is updated in the DBus interface, and is by default 30s. See https://www.freedesktop.org/software/ModemManager/api/latest/gdbus-org.freedesktop.ModemManager1.Modem.Location.html#gdbus-method-org-freedesktop-ModemManager1-Modem-Location.SetGpsRefreshRate E.g. the GPS NMEA traces may be reported every 1s by the modem; but MM only published them in DBus every 30s (or whatever other time was specified in SetGpsRefreshRate(). If you configure a value of 0 in SetGpsRefreshRate(), the rate of publishing in DBus will be equal to the rate used by the modem to report the NMEA traces. Also, worth noting, this publishing rate is only applicable if "signals_location" is enabled in the Setup() call. This is also for security purposes; because Properties and Signals (e.g. PropertiesUpdated) are not protected by polkit rules, while methods are. If you're using only the GetLocation() method, SetGpsRefreshRate() is basically useless. What you're looking for is a way to tell the modem how often it should send the NMEA traces, and unfortunately there is no way to request that via MM API. There is some ongoing draft work on what that API could look like, thinking not only on the NMEA rate but also in being able to configure which NMEA traces are required. Please check https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/merge_requests/325 -- Aleksander https://aleksander.es _______________________________________________ ModemManager-devel mailing list ModemManager-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/modemmanager-devel
