Re: [Gpsbabel-code] Reading U-Blox EVK-M91 serial data
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robertl
From: Geo D. <geo...@gm...> - 2022-07-31 04:17:48
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Il giorno sab 30 lug 2022 alle ore 12:22 Greg Troxel <gd...@le...> ha scritto: > > You didn't explain what you are trying to do, and jumped to the > conclusion that you need to use gpsbabel. Maybe you are right, but I'd > say the odds are low. > Yes, sorry, it remains in my brain only :) Before all, let me introduce myself: my name is Roberto (geodrinx) Angeletti and among other things I am the developer of a plugin for QGIS called GEarthView, which was among the most downloaded and used plugins in QGIS version 2.x.x. Apart from that, now I'm working on using a high resolution gps, such as the U-Blox EVK-M91, to perform surveys via QGIS and QField (which is the android version of QGIS). Basically, I have to use the U-Blox as a mouse :) I tried to use the standard QGIS functions to read the coordinates from gps, but it doesn't work. Investigating, I saw that QGIS simply uses gpsBabel to take a single point at a time. So, I installed a gpsBabel and I went to analyze why gpsBabel returns error, and what were the right parameters to read the data from U-Blox. This is the story so far. > > I am sure it is a standard gps NMEA sentence file format, but... how to > > successfully read it? > > You are sure because > 1) you read the documentation and it says it is NMEA, and if so which > version? > 2) you looked at the data stream and it looks like NMEA? > 3) something else? > none of this. Perhaps I have simply misunderstood the data in my possession. > > > PS: I bought the U-Blox EVK-M91 evaluation kit two weeks ago > > Is this the device you are trying to read? If so, that's very important > information... For anyone else following along: > > https://content.u-blox.com/sites/default/files/EVK-M91_Userguide_%28UBX-19056858%29.pdf?hash=undefined > See "5 Device Description" on page 10. > > This seems to be a u-blox M9 in a box. hit and sunk. You have hit the target. :) > Note that this will speak u-blox binary, often written UBX. Surely you are right. The flow is likely to be binary, but I haven't checked yet. > I don't think GPSBabel supports this. > :( I would recommend that you examine the following > > gpsd (works well on u-blox F9, should be fine on M9) > https://gpsd.io/ > [Note that if you start down the gpsd path, and want to ask for help, > make sure that 1) you are not using systemd and 2) you are using the > latest release or git master. Requests for help with the version > that shipped in some ancient long-term stable will not go well.] > > https://github.com/semuconsulting/PyGPSClient > [I haven't tried this, but it looks interesting.] > Thanks for these links. Obviously, I also requested support from QGIS, but for now they are not very interested in letting people know that there is something wrong with the gps reading. Maybe it's complicated to fix, or it's just me, and therefore has a very low priority in their bug fix list. Who knows? A presto Roberto |