uuid.py

# uuid.py
#
# Create a Bluetooth LE service UUID, formatted for use with Nordic's SDK
#
# Keith Brafford (2019 Sep 24)

import click
import requests
import re
import sys

# nordic lbs uuid (for testing)
#uuid = '00001523-1212-EFDE-1523-785FEABCD123'

# Reverse and flatten a 2-deep nested list
def flatten_uuid(uuid):
    def inner(l):
        while l:
            yield l.pop()

    def outer(l):
        while l:
            g = inner(l.pop())
            for item in g:
                yield item

    g = outer([[int(x) for x in bytes.fromhex(s)] for s in uuid.split("-")])
    return list(g)

TEMPLATE = """/* ble service '%s' UUID: %s */

#define %s_UUID_BASE {%s \\
%s%s}
"""

def uuid_to_c(uuid, svc_name="MYSERVICE"):
    # zero out the values that will be over-written by the characteristic
    uuid = uuid[0:4] + "0000" + uuid[8:]

    values = flatten_uuid(uuid)

    vals_0 = ", ".join(["0x%02x" % v for v in values[:8]])
    vals_1 = ", ".join(["0x%02x" % v for v in values[8:]]).strip(", ")
    indentation = " " * (len(svc_name) + 20)
    print(TEMPLATE % (svc_name.lower(), uuid, svc_name.upper(), 
          vals_0, indentation, vals_1))

@click.command()
@click.option('--uuid', default = 'x', help="your existing uuid; omit to generate random uuid")
@click.option('--svc_name', default = "MYSERVICE", help="ble service name")
def uuid(uuid, svc_name):
    """Generate Bluetooth Low Energy UUIDs for use with the Nordic Semiconductor Ecosystem"""

    r = re.compile("[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}")
    UUID_URL = "https://www.uuidgenerator.net/version4"

    if uuid == "x":    
        content = requests.get(UUID_URL).text
        uuid = r.findall(content)[0]
    else:
        # do a sanity check to see that they passed in something that looks like the
        # type of UUID we are looking for
        if not r.findall(uuid):
            sys.stderr.write("Error: '%s' doesn't look like a BLE UUID\nsee %s for details" %
                             (uuid, UUID_URL))
            sys.exit(1)

    uuid_to_c(uuid, svc_name = svc_name)

if __name__ == "__main__":
    uuid()

C:\Users\Keith>python uuid.py --help
Usage: uuid.py [OPTIONS]

  Generate Bluetooth Low Energy UUIDs for use with the Nordic Semiconductor
  Ecosystem

Options:
  --uuid TEXT      your existing uuid; omit to generate random uuid
  --svc_name TEXT  ble service name
  --help           Show this message and exit.

C:\Users\Keith>python uuid.py --svc_name "KEITH"
/* ble service 'keith' UUID: c46e0000-16fc-44e9-8484-7dc21d8cfb84 */

#define KEITH_UUID_BASE {0x84, 0xfb, 0x8c, 0x1d, 0xc2, 0x7d, 0x84, 0x84 \
                         0xe9, 0x44, 0xfc, 0x16, 0x00, 0x00, 0x6e, 0xc4}