Hi @jiazi.1hao ,
not sure the SensorTile.box is equipped natively (at least with the firmware function pack available) for the MQTT transmission.
The ST BLE Sensor app is shared also with other design platforms, and in particular with the STEVAL-STWINKT1B and the STSW-STWINCELL pack, that enables the connection of industrial nodes to the Internet via cellular networks. It represents a baseline solution that developers can build on to reduce design cycle overheads on their final products and applications. The software performs time domain and spectral analysis on IIS3DWB accelerometer (up to 6 kHz), environmental (temperature, pressure and relative humidity) and ultrasound data (up to 80 kHz), and transmits results to the DSH-PREDMNT AWS cloud dashboard application using the MQTT protocol.
You can find more details in the Application Note AN5472, p.33, and also on the Element14 community.
Since the MQTT ecosystem is much more developed for the STWINKT1B, I suggest you to start from this example, and try to implement the MQTT connection for the SensorTile.box
-Eleon
