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Re: [gpsd-users] Processing RTCM messages

From: Greg Troxel
Subject: Re: [gpsd-users] Processing RTCM messages
Date: Mon, 08 Feb 2016 15:46:52 -0500
User-agent: Gnus/5.130014 (Ma Gnus v0.14) Emacs/24.5 (berkeley-unix)

Michele Pangrazzi <address@hidden> writes:

> To explain better: right now I have a webserver that receives a NMEA
> string through an API from an embedded device with a GPS connected.

Do you mean NMEA sentences with computed positions?

Or do you mean a device that is *generating* corrections?

> Then, the webserver sends this string using NTRIP protocol
> to an NTRIP Caster, which responds correctly with some RTCM messages
> (type 1012 and 1004), parsed to JSON by your gpsdecode tool.

Which string, and why would it be sent, vs just getting the RTCM bits
over IP?

> Is it possible to also process RTCM messages, compute the correction
> and then send back the corrected position to client?

Are you using a receiver which is sending raw pseudoranges over NMEA?

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