Switchbot - meter plus (via https://github.com/shmuelzon/esp32-ble2mqtt)

config.json

{
  "network": {
    "wifi": {
      "ssid": "XiFi",
      "password": ""
    }
  },
  "mqtt": {
    "server": {
      "host": "192.168.88.253",
      "port": 1883
    },
    "publish": {
      "retain": true
    },
    "topics": {
      "prefix": "BLE/",
      "get_suffix": "/Get",
      "set_suffix": "/Set"
    }
  },
  "ble": {
    "whitelist": [
      "C6:C7:52:66:3C:BF"
    ],
    "services": {
      "definitions": {
        "CBA20D00-224D-11E6-9FB8-0002A5D5C51B": {
          "name": "SwitchBot"
        }
      }
    },
    "characteristics": {
      "definitions": {
        "CBA20002-224D-11E6-9FB8-0002A5D5C51B": {
          "name": "Request"
        },
        "CBA20003-224D-11E6-9FB8-0002A5D5C51B": {
          "name": "Response"
        }
      }
    }
  },
  "log": {
    "host": "224.0.0.200",
    "port": 5000
  }
}

mqtt.md

Publish 87,15,49 to topic BLE/c6:c7:52:66:3c:bf/SwitchBot/Request/Set Subscribe to topic BLE/c6:c7:52:66:3c:bf/SwitchBot/Request/Request and parse. Sample code in JS below.

parse.js

let response = "1,4,150,51"
let [a, b, c, d] = response.split(",")

// console.log(c *= -1)

if (c <= 128) {
  c *= -1
  b *= -1
} else {
  c -= 128
}

temp = c + b;

console.log(`temp: ${c}.${b}c - ${d}%`);
//> "temp: 22.4c - 51%"