How to send NMEA $GPGGA sentence to Ntrip caster to get virtual reference station RTCM frames when using STR2STR

[thoyo]

So far I am using RTKRCV to process my rover's data with respect to a virtual reference station with RTK and this works like a charm. To do so, I set the following parameters on the config file:

...
inpstr2-path       =ign:ergnss@ergnss-tr.ign.es/VRS
inpstr2-nmeareq   =latlon       # (0:off,1:latlon,2:single)
inpstr2-nmealat    =41.5          # (deg)
inpstr2-nmealon   =1.0            # (deg)
...

If I don't want to do RTK and only get the data from the caster, can I use STR2STR? How can I do it to send the lat/lon positions to the caster ($GPGGA sentence) while using STR2STR?

[thoyo]

If someone else is interested, I found it:

./str2str.e -in ntripcli://ign:ergnss@ergnss-tr.ign.es/VRS -p 41.5 1.0 0.0 -n 1 -out file.rtcm3

The flags -p (position) and -n (request cycle) do the trick.