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# Initialise the USB dongle

$ sudo hciconfig hci0 up

# Scan for the UART BLE device

$ sudo hcitool lescan

D6:4E:06:4F:72:86 UART

# Start gatttool, pointing to the UART device found above

$ sudo gatttool -b D6:4E:06:4F:72:86 -I -t random --sec-level=high

[D6:4E:06:4F:72:86][LE]> connect

Attempting to connect to D6:4E:06:4F:72:86

Connection successful

# Scan for primary GATT Services

[D6:4E:06:4F:72:86][LE]> primary

attr handle: 0x0001, end grp handle: 0x0007 uuid: 00001800-0000-1000-8000-00805f9b34fb

attr handle: 0x0008, end grp handle: 0x0008 uuid: 00001801-0000-1000-8000-00805f9b34fb

attr handle: 0x0009, end grp handle: 0x000e uuid: 6e400001-b5a3-f393-e0a9-e50e24dcca9e

attr handle: 0x000f, end grp handle: 0xffff uuid: 0000180a-0000-1000-8000-00805f9b34fb

# Get the handles for the entries in the UART service (handle 0x0009)

[D6:4E:06:4F:72:86][LE]> char-desc

handle: 0x0001, uuid: 00002800-0000-1000-8000-00805f9b34fb

handle: 0x0002, uuid: 00002803-0000-1000-8000-00805f9b34fb

handle: 0x0003, uuid: 00002a00-0000-1000-8000-00805f9b34fb

handle: 0x0004, uuid: 00002803-0000-1000-8000-00805f9b34fb

handle: 0x0005, uuid: 00002a01-0000-1000-8000-00805f9b34fb

handle: 0x0006, uuid: 00002803-0000-1000-8000-00805f9b34fb

handle: 0x0007, uuid: 00002a04-0000-1000-8000-00805f9b34fb

handle: 0x0008, uuid: 00002800-0000-1000-8000-00805f9b34fb

handle: 0x0009, uuid: 00002800-0000-1000-8000-00805f9b34fb

handle: 0x000a, uuid: 00002803-0000-1000-8000-00805f9b34fb

handle: 0x000b, uuid: 6e400002-b5a3-f393-e0a9-e50e24dcca9e

handle: 0x000c, uuid: 00002803-0000-1000-8000-00805f9b34fb

handle: 0x000d, uuid: 6e400003-b5a3-f393-e0a9-e50e24dcca9e

handle: 0x000e, uuid: 00002902-0000-1000-8000-00805f9b34fb

handle: 0x000f, uuid: 00002800-0000-1000-8000-00805f9b34fb

handle: 0x0010, uuid: 00002803-0000-1000-8000-00805f9b34fb

handle: 0x0011, uuid: 00002a27-0000-1000-8000-00805f9b34fb

# 6e400002 (handle 0x000b) = TX characteristic

# 6e400003 (handle 0x000d) = RX characteristic

# Optional (but maybe helpful) ... scan for CCCD entries

[D6:4E:06:4F:72:86][LE]> char-read-uuid 2902