Firmware as of 11 August 2017
App version 1.0.11 / Firmware: 1.0.00.0140
gatttool -I -b 00:16:53:A4:CD:7E
primary
attr handle: 0x0001, end grp handle: 0x0004 uuid: 00001801-0000-1000-8000-00805f9b34fb
attr handle: 0x0005, end grp handle: 0x000b uuid: 00001800-0000-1000-8000-00805f9b34fb
attr handle: 0x000c, end grp handle: 0x000f uuid: 00001623-1212-efde-1623-785feabcd123
characteristics
handle: 0x0002, char properties: 0x20, char value handle: 0x0003, uuid: 00002a05-0000-1000-8000-00805f9b34fb
handle: 0x0006, char properties: 0x4e, char value handle: 0x0007, uuid: 00002a00-0000-1000-8000-00805f9b34fb
handle: 0x0008, char properties: 0x4e, char value handle: 0x0009, uuid: 00002a01-0000-1000-8000-00805f9b34fb
handle: 0x000a, char properties: 0x02, char value handle: 0x000b, uuid: 00002a04-0000-1000-8000-00805f9b34fb
handle: 0x000d, char properties: 0x1e, char value handle: 0x000e, uuid: 00001624-1212-efde-1623-785feabcd123
char-desc
handle: 0x0001, uuid: 00002800-0000-1000-8000-00805f9b34fb
handle: 0x0002, uuid: 00002803-0000-1000-8000-00805f9b34fb
handle: 0x0003, uuid: 00002a05-0000-1000-8000-00805f9b34fb
handle: 0x0004, uuid: 00002902-0000-1000-8000-00805f9b34fb
handle: 0x0005, uuid: 00002800-0000-1000-8000-00805f9b34fb
handle: 0x0006, uuid: 00002803-0000-1000-8000-00805f9b34fb
handle: 0x0007, uuid: 00002a00-0000-1000-8000-00805f9b34fb
handle: 0x0008, uuid: 00002803-0000-1000-8000-00805f9b34fb
handle: 0x0009, uuid: 00002a01-0000-1000-8000-00805f9b34fb
handle: 0x000a, uuid: 00002803-0000-1000-8000-00805f9b34fb
handle: 0x000b, uuid: 00002a04-0000-1000-8000-00805f9b34fb
handle: 0x000c, uuid: 00002800-0000-1000-8000-00805f9b34fb
handle: 0x000d, uuid: 00002803-0000-1000-8000-00805f9b34fb
handle: 0x000e, uuid: 00001624-1212-efde-1623-785feabcd123
handle: 0x000f, uuid: 00002902-0000-1000-8000-00805f9b34fb
handle 0x0007 = 2A00 = Device Name
char-read-hnd 0x07
Characteristic value/descriptor: 4c 45 47 4f 20 4d 6f 76 65 20 48 75 62
The hexadecimal values on string "4c 45 47 4f 20 4d 6f 76 65 20 48 75 62" are the ASCII values of "LEGO Move Hub"
We can change "Device Name" but after power cycle the firmware resets it to "LEGO Move Hub" again.
All functionality seems to be on handle 0x0e (uuid: 00001624-1212-efde-1623-785feabcd123)
As noticed by rblaakmeer on isuse #5 all messages sent to / recevived from the BOOST Move Hub start with a number stating the length of the message, like the command to change RGB LED color to Red:
0800813211510009