I was playing around with the GPIOs and noticed that in the schematic of the Maix Go GPIOs 9 and 10 are connected to BPSK (Binary phase-shift keying?) which are (for me) some strange squares with just 0s and 1s and Not Connected (?) to IPEX. IPEX is - I think - the antenna for the wifi.
What do BPSK and IPEX do? Is it functional?