Hope to seek some directional advice as I am currently not able to get data from HC-05.I’m now working a project to dedect heartrate but I don’t know how to set blocks to achieve my goal.I will appreciate it that if soomeone can give a help hand.
Hello @1771764231rbfiwe, welcome to Thunkable! 
Have you tried to use the “Subscribe To Characteristics” block?
The “when characteristic change” block will be activated whenever the characteristic value changes on the peripheral (server) device. Data from the BLE device may be received in either String or Byte format.
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First of all, thank you very much for your reply; it has been very helpful to me, and I have identified the type of error. Is there any way to make it work on a computer, specifically one running Windows 11?
Hi @1771764231rbfiwe
The BLE blocks doesn’t work on computers. You can use the Thunkable Live app to test it on Android.
For iOS, you need to build the app and install it on your iOS device.