Note: I never got this to work, just leaving my notes.
sensor: - platform: mitemp_bt name: XIAOMI_Mijia_LYWSD03MMC _1 mac: 'xx:xx:xx:xx:xx:xx' force_update: false median: 3 timeout: 10 retries: 2 cache_value: 300 adapter: hci0 monitored_conditions: - temperature - humidity - battery