gatttool example

root@mm_pi0w:~# gatttool -b B4:C9:4C:84:97:DE -I
[B4:C9:4C:84:97:DE][LE]> connect
Attempting to connect to B4:C9:4C:84:97:DE
Connection successful
[B4:C9:4C:84:97:DE][LE]> characteristics
handle: 0x0002, char properties: 0x02, char value handle: 0x0003, uuid: 00002a00-0000-1000-8000-00805f9b34fb
handle: 0x0004, char properties: 0x02, char value handle: 0x0005, uuid: 00002a01-0000-1000-8000-00805f9b34fb
handle: 0x0006, char properties: 0x0a, char value handle: 0x0007, uuid: 00002a02-0000-1000-8000-00805f9b34fb
handle: 0x0008, char properties: 0x02, char value handle: 0x0009, uuid: 00002a04-0000-1000-8000-00805f9b34fb
handle: 0x000d, char properties: 0x22, char value handle: 0x000e, uuid: 00002a05-0000-1000-8000-00805f9b34fb
handle: 0x0011, char properties: 0x02, char value handle: 0x0012, uuid: 00002a29-0000-1000-8000-00805f9b34fb
handle: 0x0013, char properties: 0x02, char value handle: 0x0014, uuid: 00002a24-0000-1000-8000-00805f9b34fb
handle: 0x0015, char properties: 0x02, char value handle: 0x0016, uuid: 00002a26-0000-1000-8000-00805f9b34fb
handle: 0x0017, char properties: 0x02, char value handle: 0x0018, uuid: 00002a28-0000-1000-8000-00805f9b34fb
handle: 0x001a, char properties: 0x0a, char value handle: 0x001b, uuid: 47e9ee01-47e9-11e4-8939-164230d1df67
handle: 0x001c, char properties: 0x0a, char value handle: 0x001d, uuid: 47e9ee10-47e9-11e4-8939-164230d1df67
handle: 0x001e, char properties: 0x0a, char value handle: 0x001f, uuid: 47e9ee11-47e9-11e4-8939-164230d1df67
handle: 0x0020, char properties: 0x0a, char value handle: 0x0021, uuid: 47e9ee12-47e9-11e4-8939-164230d1df67
handle: 0x0022, char properties: 0x0a, char value handle: 0x0023, uuid: 47e9ee13-47e9-11e4-8939-164230d1df67
handle: 0x0024, char properties: 0x0a, char value handle: 0x0025, uuid: 47e9ee14-47e9-11e4-8939-164230d1df67
handle: 0x0026, char properties: 0x0a, char value handle: 0x0027, uuid: 47e9ee15-47e9-11e4-8939-164230d1df67
handle: 0x0028, char properties: 0x0a, char value handle: 0x0029, uuid: 47e9ee16-47e9-11e4-8939-164230d1df67
handle: 0x002a, char properties: 0x0a, char value handle: 0x002b, uuid: 47e9ee20-47e9-11e4-8939-164230d1df67
handle: 0x002c, char properties: 0x0a, char value handle: 0x002d, uuid: 47e9ee21-47e9-11e4-8939-164230d1df67
handle: 0x002e, char properties: 0x0a, char value handle: 0x002f, uuid: 47e9ee22-47e9-11e4-8939-164230d1df67
handle: 0x0030, char properties: 0x0a, char value handle: 0x0031, uuid: 47e9ee23-47e9-11e4-8939-164230d1df67
handle: 0x0032, char properties: 0x0a, char value handle: 0x0033, uuid: 47e9ee24-47e9-11e4-8939-164230d1df67
handle: 0x0034, char properties: 0x0a, char value handle: 0x0035, uuid: 47e9ee25-47e9-11e4-8939-164230d1df67
handle: 0x0036, char properties: 0x0a, char value handle: 0x0037, uuid: 47e9ee26-47e9-11e4-8939-164230d1df67
handle: 0x0038, char properties: 0x0a, char value handle: 0x0039, uuid: 47e9ee27-47e9-11e4-8939-164230d1df67
handle: 0x003a, char properties: 0x0a, char value handle: 0x003b, uuid: 47e9ee2a-47e9-11e4-8939-164230d1df67
handle: 0x003c, char properties: 0x0a, char value handle: 0x003d, uuid: 47e9ee2b-47e9-11e4-8939-164230d1df67
handle: 0x003e, char properties: 0x0a, char value handle: 0x003f, uuid: 47e9ee2c-47e9-11e4-8939-164230d1df67
handle: 0x0040, char properties: 0x0a, char value handle: 0x0041, uuid: 47e9ee2d-47e9-11e4-8939-164230d1df67
handle: 0x0042, char properties: 0x0a, char value handle: 0x0043, uuid: 47e9ee2e-47e9-11e4-8939-164230d1df67
handle: 0x0044, char properties: 0x1a, char value handle: 0x0045, uuid: 47e9ee40-47e9-11e4-8939-164230d1df67
handle: 0x0047, char properties: 0x08, char value handle: 0x0048, uuid: 47e9ee30-47e9-11e4-8939-164230d1df67
[B4:C9:4C:84:97:DE][LE]> char-read-uuid 00002a00-0000-1000-8000-00805f9b34fb
handle: 0x0003   value: 43 6f 6d 65 74 20 42 6c 75 65
[B4:C9:4C:84:97:DE][LE]> disconnect

(gatttool:608): GLib-WARNING **: Invalid file descriptor.

[B4:C9:4C:84:97:DE][LE]> quit

root@mm_pi0w:~# echo "43 6f 6d 65 74 20 42 6c 75 65" | xxd -r -p
Comet Blue