Yicam MQTT question

the Yi cam, with AI, hack can do MQTT and this is what I see when I listen:

now, what and where should i put in the config file to make it work?
basically i want to play a sound on my siren when a person is detected.

tried with this in my config but it still does not work

binary_sensor:
  - platform: mqtt
    state_topic: "yicam/ai_human_detection"
    name: 'motion Yi human'

yaml syntax is correct but what am i missing? in Dev Tool, the state is stuck with “off,” even though i see the state topic appear every time the cam detects human.

happy to say this works in my config yaml:

binary_sensor:
  - platform: mqtt
    state_topic: "yicam/ai_human_detection"
    name: 'Yi human'
    payload_on: "human_stop"

to turn it “off,” i have to use another automation to set the state to off after 1min.