aioble how do i list all services and characteristics

[colinc3e]

I have been using aioble to connect a client to an existing peripheral - all working well when I knew what the peripherals UUIDs were.
Then I thought can we just list services and/or characteristics and pick the ones we want ( I have done this with C/C++ bluetooth before.
I should say now that I and using a pico w was the client. now I am using thonny and micro python so moved to aioble as it seemed easier to use than the C/C++ libraries
so I include

import sys
import uasyncio as asyncio
import aioble
import bluetooth
import struct

Then I find the device and connect to it and look for services:

async def discover_services_and_characteristics(connection):
    print("Discovering services...")
    #service = await connection.service(_SERVICE_UUID)   # specific service
    services = await connection.services()
    for service in range(services):
          if service.uuid() == _SERVICE_UUID:
              print("Found target Service")     
              characteristics = await service.characteristics()
              for char in characteristics:
                  print(f"characteristic {char}")

this gave me ~ ClientDiscovery object isn't iterable
I have difficulty finding details of aioble methods but the 'service.characteristics call was from a google search (AI possibly)
I also tried

characteristics = await aioble.discover_characteristics(connection)

which was found in a google AI search result - i have found that none of the AI answers work

so if anyone can point me in the right direction or a sample piece of code to find the services and characteristics from a connection without knowing what the UUIDs are for services and Characteristics

Colin C

[ekspla]

Please see the comment of def services() in device.py

    # Search for all services (optionally by uuid).
    # Use with `async for`, e.g.
    #     async for service in device.services():
    # Note: must allow the loop to run to completion.

An example code:

import asyncio
import aioble
import bluetooth

_TARGET_NAME = "mpy-nus"
_SERVICE_UUID = bluetooth.UUID("6e400001-b5a3-f393-e0a9-e50e24dcca9e")

async def discover_device(target_name):
    # Scan for 20 seconds, in active mode, with very low interval/window (to maximise detection rate).
    async with aioble.scan(duration_ms=20_000, interval_us=30000, window_us=30000, active=True) as scanner:
        async for result in scanner:
            # See if it matches target_name.
            if (name := result.name()) is not None and target_name in name:
                print(f"Found target device: {name} - {result.device}")
                return result.device

        print(f"Device with name {target_name} not found.")
        return None

async def run():
    device = await discover_device(_TARGET_NAME)
    if not device:
        return

    connection = await device.connect(
        timeout_ms=60_000, 
        scan_duration_ms=5_000, min_conn_interval_us=7_500, max_conn_interval_us=7_500)

    async with connection:
        print(f"Connected to {device}")

        found = False
        async for service in connection.services():
            if service.uuid == _SERVICE_UUID:
                print("Found target Service")
                found = True

        # After the loop completion.
        if found:
            service = await connection.service(_SERVICE_UUID)
            async for char in service.characteristics():
                print(f"characteristic {char}")

asyncio.run(run())

[colinc3e]

Thanks for that - never thought of doing it that way
i did try it and it works great
so many thanks - will keep going with "with service in connection" etc I can make a list from that
Colin