pxt-calliope/docs/device/bluetooth/hf2.md

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# Bluetooth HF2
The Bluetooth HF2 service implements a subset of [HF2](https://github.com/Microsoft/uf2/blob/master/hf2.md), namely the serial message logging.
## Service
### HF2 service
* UUID: ``b112f5e6-2679-30da-a26e-0273b6043849``
### TX Characteristic
* Optional
* UUDI: ``b112f5e6-2679-30da-a26e-0273b604384a``
* NOTIFY only
This characteristic mostly emits HF2 serial messages. The first byte contains the type of message and length in the lower 6 bits. The message contains up to 19 bytes.
This service is supported by the MakeCode editor to receive messages.