In order to secure my father, who lived solo,
- in the home security server (on Raspberry PI), with IoT communication device "SORACOM",
- I made the closed private network (by SoftEther), and
- accessed to the server from my home PC by SSH
From Golden Week holidays of this May, I continued the experiments and developments little by little, and
finally, I could confirm the activation at this weekend.
However, my father is nowhere to be found (belowground at the end of this July)