Snap side: Devices exposing UART service over BT/BLE sometimes install virtual serial port drivers, which can be accessed via the Serial Ports library. Right now, I'm not aware of any general-purpose, direct, Web Bluetooth library for
MB side: BLE UART support was implemented behind a conditional directive and required MB firmware built on purpose.
Maybe @tguneysu can provide some information about the current status of the BLE/BT support in MicroBlocks.
