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.

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However, my father is nowhere to be found (belowground at the end of this July)