Hi dalexxvtxvz, welcome to Thunkable! 
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What have you been able to do with the Raspberry PI to get it to set up for BLE connection? Assuming you can find a read and write UUID, you should be able to at least connect to the device. From there, you’ll need to figure out send the data. Thunkable supports reading and writing strings, byte arrays, and hexidecimal data.
This topic has been brought up before so searching will also help.