I am using an RUT955 on legacy firmware for the NTRIP client over RS232.
I have connected a GPS receiver which is configured to output NMEA GGA data.
When i connect to my management software with a GPS antenna connected to the RUT955 and acquire GPS location selected it will connect and get an RTK fix.
If i dont use the antenna and use an initial GGA string it connects but it does not get a fix (our software and directly to a Trimble AG542 base running RTCM caster). In the software I can briefly see its position but then it vanishes.
I believe it is staying logged in but its not taking its location properly from the receiver.
baud rates etc are all correct both ends. Tried multiple message frequencies as well. i have seen these installed in same machines before without a GPS antenna so it must work and i have a setting wrong.
edit - testing with GGA strings. if i use this '$GPGGA,150442.00,5121.281333,N,00115.821320,E,4,08,1.0,24.234,M,47.028,M,1.0,0000*73' at the machine it seems to work but if i use that same GGA string on restart in a machine a few hundred meters away it does not work. I have to get a gga string from a connection made with the modems gps antenna at the location i am trying to connect and then it will connect using default gga string.