NMEA output

[ktuulos]

Is your feature request related to a problem? Please describe. I have some applications, which operate on NMEA feed. They don't understand binary messages. Currently RTKBase works only using binary messages and there is no ready-made option to enable also NMEA message forwarding. However, at least in F9P, it is possible to get both NMEA and binary messages, as I understand.

Describe the solution you'd like There should be possibility to enable NMEA messages from GNSS receiver and those should be available in some TCP port.

Describe alternatives you've considered Currently I have connected a separate GPS receiver to another Raspberry and serving NMEA from that.

Additional context None.

[Stefal]

Hi! NMEA output on a base station ? What you want looks like a Rover, not a Base. Or I don't understand how you want to use RTKBase.

[ktuulos]

NMEA is needed to certain applications, which e.g. track visible satellites by parsing NMEA feed. It is much easier to parse, than binary format.

[Stefal]

Ok! There are at least 2 ways to do this:

1. Customize RTKBase:

• Edit https://github.com/Stefal/rtkbase/blob/master/web_app/rtklib_configs/rtkbase_ppp-static_default.conf to output nmea
• modify server.py to launch start_Base https://github.com/Stefal/rtkbase/blob/fa86a03661364d1e1fd79cd611f5f63816d61363/web_app/server.py#L499-L514
• modify server.py to disable the start_Base timeout https://github.com/Stefal/rtkbase/blob/fa86a03661364d1e1fd79cd611f5f63816d61363/web_app/server.py#L153-L158

2. Use existing tools as:

• gpsdecode from gpsd. This tool can parse a RTCM stream
• run rtkrcv from another computer connected to the tcp ubx stream

BTW: I'd like to have a sky view inside the status page. See #100