RTK base with a Raspberry pi4 and SimpleRTK2B

You only have the message 1084 enabled. The position is given by the 1005. Also, you need a few other ones to get a RTK fix. This was discussed here.

Indeed, you enable them using U-center :
Activate RTCM U-center
The value you enter is the transmission period. Use 1 s for all messages, except for 1005 which can be send at 10 s period with no negative incidence

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