I implemented network functionality using a Raspberry Pi Pico and CircuitPython. Starting with automatic IP address acquisition via DHCP, I also enabled HTTP web client functionality and GET/POST communication. Now, I can use the Raspberry Pi Pico as an IoT device.

*Regarding the Master/Slave designations in MOSI/MISO:
MOSI is generally considered an abbreviation for Master Out, Slave In, but these days the terms Master/Slave are increasingly considered undesirable from a human rights perspective.
For this reason, this video avoids the terms Master/Slave and instead uses the terms Microcontroller/Sensor in accordance with the definitions used by Adafruit (CircuitPython).

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■CircuitPython & Wiznet W5500 Instruction Page
learn.adafruit.com/ethernet-for-circuitpython

■CircuitPython (for Pico) Download Page
circuitpython.org/board/raspberry_pi_pico/

■CircuitPython Library Download Page
github.com/adafruit/Adafruit_CircuitPython_Bundle/…

■CircuitPython & Raspberry Pi Pico Specifications Page
learn.adafruit.com/getting-started-with-raspberry-…

■CO2 Sensor Construction Video
   • 【ラズパイ】ラズパイで二酸化炭素濃度測定器を作ってみた【CO2測定】  

■Nature Remo
nature.global/