you can test this V1.0.18 have fixed this bug. here is download firmware:
KC868_A8S_V1.0.18.zip (Size: 720.1 KB / Downloads: 176)
mqtt feedback message for analog input range is 0--4095
KC868_A8S_V1.0.18.zip (Size: 720.1 KB / Downloads: 176)
mqtt feedback message for analog input range is 0--4095