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  • bitdays.co.kr/2021/08/06/%25EC%2583%2581%25ED%2599%25A9%25EC%259D%25B4-iot-%25EB%25B3%25B4%25EC%2595%2588%25EC%259D%2598-%25EC%259D%25B8%25ED%2584%25B0%25EB%2584%25B7-%25EC%258B%259C%25EC%259E%25A5-2021-%25EA%25B8%2580%25EB%25A1%259C%25EB%25B2%258C-%25EC%25A0%2584%25EB%25A7%259D-%25EC%2584%25B1%25EC%259E%25A5-%25EC%259D%25B8/ (port 80)