So, with some help from the RTKBase community, I was able to get RTKBase working with the LG290P. I was doing 99% of the things right but was missing one small detail, which I won’t mention, because it’s embarrasing! Basically execute the following commands on your LG290P after entering Base station mode from factory default:
$PQTMCFGMSGRATE,W,RTCM3-1019,1*54
$PQTMCFGMSGRATE,W,RTCM3-1020,1*5E
$PQTMCFGMSGRATE,W,RTCM3-1042,1*5A
$PQTMCFGMSGRATE,W,RTCM3-1046,1*5E
$PQTMCFGMSGRATE,W,GGA,1*0A
$PQTMCFGMSGRATE,W,RMC,1*17
$PQTMCFGMSGRATE,W,GLL,1*0C
$PQTMCFGMSGRATE,W,VTG,1*0E
$PQTMCFGMSGRATE,W,GSA,1*1E
$PQTMCFGMSGRATE,W,RTCM3-1005,0*59 - This disable 1005 because RTKBase will send from the set base co-ordinates.
Save and reboot and you can connect to RTKBase. Set your Main Service receiver protocol to rtcm3, and set the correct bit rate and base co-ordinates.