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| [[file:gnss_sat_cnt_hist_Screenshot_20250801.png | 300px]] | | [[file:gnss_sat_cnt_hist_Screenshot_20250801.png | 300px]] |
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| == Required packages ==
| | Left: Satellite movement in the sky above. Mid: Reported movement of the stationary antenna. Right: Number of tracked satellites over the last ~20 hours. |
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| Install Geographic library from https://geographiclib.sourceforge.io/C++/doc/install.html.
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| Other libraries should be in the default repository.
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| libgeographiclib-dev
| | == Installation issues == |
| libpaho-mqttpp-dev
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| qt6-base-dev
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| sudo apt install libgeographiclib-dev libpaho-mqttpp-dev qt6-base-dev
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| === For Python install ===
| | [[Weather monitor installation | Installation issues]] issues. |
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| pip install geographiclib
| | [[Wearher monitor modules | Modules]] |
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| sudo apt install python3-geographiclib
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| === Build ===
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| Code is found here (on SVN)
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| svn co svn://repos.gbar.dtu.dk/jcan/svnjca/projekter/gnss_receiver
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| The C++ code is then in qt/gnss_qt
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| Build by
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| cd gnss_receiver/qt/gnss_qt
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| mkdir -p build
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| cd build
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| cmake ..
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| make -j3
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| Run to create a configuration file
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| ./gnss_qt
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| == CMake problem ==
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| === GeographicLibConfig.cmake ===
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| The find package
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| find_package(GeographicLib REQUIRED)
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| in cmake fails, as the file GeographicLibConfig.cmake is not found.
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| This can be fixed by renaming the provided file ''FindGeographicLib.cmake'' by
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| cd /usr/share/cmake/geographiclib
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| sudo ln -s FindGeographicLib.cmake GeographicLibConfig.cmake
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| === XKB ===
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| Missing library, and CMake complains:
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| -- Could NOT find XKB (missing: XKB_LIBRARY XKB_INCLUDE_DIR) (Required is at least version "0.5.0")
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| The solution was to install
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| sudo apt install libxkbcommon-dev
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| This occurred on Raspberry Pi 5 using the 64-bit default OS.
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| == Configure ==
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| After the gnss_qt is run the first time, there should be a default configuration file
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| [service]
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| logpath = log_%d/
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| ; the '%d' will be replaced with date and timestamp (must end with a '/'). =
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| max_logging_minutes = 60.0
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| log_service = true
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| [mqttin]
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| broker = tcp://10.59.9.201:1883
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| context = not used
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| clientid = ublox9_in
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| function = nmea/
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| system = ublox9/
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| log = true
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| print = false
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| use = false
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| [gnss]
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| input_use = true
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| input = /dev/ttyACM0
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| ; input = ../../../log/log_mqtt.txt
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| log = false
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| [in]
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| ; set 'saveconfig' to 'false' to avoid autosave =
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| saveconfig = false
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| version = 2285 2025-06-26 07:20:46
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| There are two input alternatives:
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| * From a file (default may be '/dev/ttyACM0') or a logfile generated by the MQTT streamer for NMEA messages. Set 'input_use = true' to use this alternative.
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| * From a MQTT server that streams the NMEA messages. Change the IP in the [mqttin] group and change to 'use=true'. The NMEA messages are assumed to be in the payload of the message, and the subject as described (subscribing to 'ublox9/nmea/#').
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