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[gpsd-dev] Possible Bug in libgpsd_core.c

From: Neustifter Andreas
Subject: [gpsd-dev] Possible Bug in libgpsd_core.c
Date: Mon, 21 Jan 2019 13:56:55 +0000

Hi all,


we have a u-blox NEO M8N chip connected via tty and used in binary mode. When the u-blox module loses the GPS signal and reports fix=1 in the UBX_NAV_SOL message the gps_data.fix.mode variable is not updated (and stays at 3) BUT (gps_data.set & MODE_SET) still is true.


My guess is that the two lines at libgpsd_core.c:1461-1462 are responsible for this behavior since MODE_SET is cleared here and the mode is thus not copied over in gps_merge_fix().


Attached a patch that attempts to fix this behavior, any thoughts on that?


(I’m unclear why the gps_data.set I get in the client has its MODE_SET bit still set but I suspect libgps_json.c:571.)


Andreas Neustifter


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Attachment: 0002-Use-fix.mode-whenever-driver-sets-it.patch
Description: 0002-Use-fix.mode-whenever-driver-sets-it.patch

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