@zmrzli Make sure you are sending the correct length and AD types according to the ADVERTISING AND SCAN RESPONSE DATA FORMAT (page 2081 on the Bluetooth 4.2 Core Spec - you can access the specification here https://www.bluetooth.com/specifications/adopted-specifications ). If you're looking to use BLE advertising packets to send your data you probably want to use AD type 0xFF (Manufacturer Specific Data) followed by the 2 company identifier octets. So your format should be 1 byte length + 0xFF + <2 bytes company identifier> + your data then filled with 00 until the 31 byte limit. You can't read improperly formatted advertising data.

@jmarcelino is there any way to configure this? Any libraries or plug ins for the board's BT sensor I could use?

I know this is an old topic I started but it seems like there is even less documentation now on this topic of using the BLE device as a peripheral. It would be nice if the documentation better represented common functionality and how the functionality is intended to be used with this device. I tried to use those links that had reference to using the BLE device as a peripheral but the link was broken.