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How to use MIT App Inventor 2 on Android

Since July 2017 there is a new Bluetooth BLE extension that makes everything much easier.

We can use the block "WriteBytesWithResponse" to send a list of bytes to BOOT.

We need to pass 4 arguments:

  • serviceserviceUuid is the uuid of LEGO BOOST Hub primary service that we use: "00001623-1212-efde-1623-785feabcd123"

  • characteristicUuid is the uuid of the only characteristic available (associated to handle "0x0e"): "00001624-1212-efde-1623-785feabcd123"

  • signed needs to be "false" in ordered to use 0..255 values

  • values is a list containing our command, we can use a "make a list" block

RGB LED White

In the photo, we send command "set RGB LED color to White", the hexadecimal format of the command is "080081321151000A" but in decimal it is "8 0 129 50 17 81 00 10" so we use a "make a list" with 8 items.