Reverse engineering a BLE clock
A while ago, I bought a ThermoPro TP358, a Bluetooth Low Energy (BLE) digital thermometer with a display. The ThermoPro shows the temperature, humidity, and air comfort indicator, as well as the time and day of the week. Its big display is nice for immediate feedback, but the device also lets you read its values and view graphs in the ThermoPro Sensor app, available on Android and iOS (Figure 1). Moreover, every time you connect to the device with the app, it synchronizes the time.
Figure 1: The ThermoPro Sensor app synchronizes the time of the digital thermometer upon connection.
While that is a nice feature, I have a couple of other types of Bluetooth sensors with a clock, and I didn't want to use multiple apps to view the sensor measurements and synchronize the clocks. For the sensor measurements, a solution already exists: Software such as Home Assistant [1] supported my devices out-of-the-box, letting me view their measurements in Home Assistant's dashboard. However, I couldn't find any solution that let me synchronize the time across all of my Bluetooth clocks without using the individual apps.
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