Hello,
I can make the data transmission, I recently developed a program to do the same thing using an ESP32 to gather data from a XIAOMI temperature and humidity sensor ( Which I suppose follows the same principle)
Although I would not recommend you doing with an Arduino, due to the lack of BLE, Bluethoot and Wi-Fi settings!
I would like to share some photos of my ESP32 BLE2MQTT project! unfortunately I could not find a place to do attachments in this site.
So let me try to briefly give you a background, my program makes the ESP32 connects to the device via BLE, take all the UUIDs, Services and Characteristics information according to the GATT protocol , connects to a WiFi and send data to the PC via MQTT protocol.
The code is already done and tested successfully, you would just need to follow instructions on the installation of the software needed to build and flash the ESP32 board (a really cheap board and better than arduino)
Please send me a message so I can provide you with photos to ensure you about the efficiency of what i'm proposing!