@Amilcar_Lucas I added some debug statements in the ERB driver and verified that the nsats and dop values are zero until measurements are sent from the base. So it looks like the Reach is not sending the nsats or dop value until it is in Floating Fix mode.
https://github.com/rrr6399/ardupilot/blob/m8p-rtk-message/libraries/AP_GPS/AP_GPS_ERB.cpp#L188