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Lightweight NTRIP caster written in .NET Core with NTRIP rev 2 support and automatic nearest base selection.

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NtripCore

NTRIP Caster written in .NET Core

This is a project of Jakub Koutny and me to learn a bit about NTRIP protocols and to have a NTRIP caster suitable to all our needs. Some points that were taken into mind during initial development:

  • it must be compatible with DJI drones (we must solve some factors that prevent establishing successfull connection in DJI Pilot app)
  • it must be lightweight, so it can be run onsite (ideally on raspberry pi)
  • it must accept data from RTKBase (https://github.com/Stefal/rtkbase/) -> eventually can run on the same machine

Actually our main goal is the compatibility layer for DJI drones.

Some other features:

  • aggregates source tables from multiple sources (e.g. our basegnss.local, rtk2go.com, CZEPOS, etc.)
  • allows "nearest" station feature (done by recalculation everytime it receives GPGGA message from client - this option is enabled by selecting NTC_Nearest mountpoint)
  • properly handles NTRIP rev 1 and rev 2 protocols (rev 2 is usually paid feature, not here :))
  • confirmed working with DJI M300 RTK (will add some numbers later)

Additional features yet to be implemented / TODO:

  • GUI
  • Automatically do cleanup (e.g. disconnect from paid streams when no one want's it anymore)
  • comment source code a bit
  • dig a bit more into NTRIP protocol, so we can support more sources

Some notes:

  • DJI is quite eager in sending NMEA GPGGA messages - it send a message almost every second
  • DJI is also quite eager in establishing connections - you should expect several connections per drone
  • DJI is quite sensitive for response formatting
  • User-Agent for M300 is NTRIP DJI_CSDK_NTRIP_CLIENT/1.4
  • uses only a small resources (during debug and one rover it was like 25 MB)

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Lightweight NTRIP caster written in .NET Core with NTRIP rev 2 support and automatic nearest base selection.

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