BAC0: "RuntimeError: no running event loop" when connecting to a foreign device

Question

I am trying to connect to a BACnet foreign device using the BAC0 Python library. Below is my script:

import BAC0

print(BAC0.version)

bbmdIP = '10.x.y.z:47808'  # Replace with actual IP
bbmdTTL = 900
bacnet = BAC0.lite(bbmdAddress=bbmdIP, bbmdTTL=bbmdTTL)  # Connect

print(bacnet.vendorName.strValue)
print(bacnet.modelName.strValue)

whois_results = bacnet.whois()
print("WhoIs results:", whois_results)

print(bacnet.devices)

bacnet.discover(networks='known')

However, I keep getting the following error:

2025-01-09 14:35:05,917 - INFO    | Starting Asynchronous BAC0 version 2024.09.10 (Lite)
2025-01-09 14:35:05,920 - INFO    | Using bacpypes3 version 0.0.98
2025-01-09 14:35:05,921 - INFO    | Use BAC0.log_level to adjust verbosity of the app.
2025-01-09 14:35:05,921 - INFO    | Ex. BAC0.log_level('silence') or BAC0.log_level('error')
Traceback (most recent call last):
  File "C:\Users\dmaske\Desktop\New folder\test_bacnet.py", line 7, in <module>
    bacnet = BAC0.connect(bbmdAddress=bbmdIP, bbmdTTL=bbmdTTL)  # Connect
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\dmaske\AppData\Roaming\Python\Python311\site-packages\BAC0\scripts\Lite.py", line 141, in __init__
    self._ping_task.start()
  File "C:\Users\dmaske\AppData\Roaming\Python\Python311\site-packages\BAC0\tasks\TaskManager.py", line 143, in start
    self.aio_task = asyncio.create_task(self.execute(), name=f"aio{self.name}")
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python311\Lib\asyncio\tasks.py", line 371, in create_task
    loop = events.get_running_loop()
           ^^^^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: no running event loop
sys:1: RuntimeWarning: coroutine 'Task.execute' was never awaited

What I have tried:

I tried running the script with different variations of BAC0.lite() and BAC0.connect(), but the error persists
I verified that my BACnet devices are accessible using Yabe software, where I can register and discover all devices successfully
I experimented with adding an event loop manually, but it didn't work

Why is asyncio.create_task() failing with RuntimeError: no running event loop, and how can I properly connect to a foreign BACnet device using BAC0?

Christian Tremblay · Accepted Answer · 2025-02-25 15:10:16Z

0

You need to start python with asyncio

python -m asyncio to get access to a event loop if you want to play around interactively.

For a script... a simple example would be something like

import BAC0
import socket
import asyncio

async def start_bacnet_server():
    async with BAC0.start(ip="10.138.103.17/16", deviceId=1112) as device1:
        # Start BACnet on a specific IP and port
        
        print("BACnet started. Discovering devices...")

        # Discover devices (this may take some time)
        await device1._discover()
        
        # Get the discovered devices
        devices = device1.discoveredDevices
        print(f"Discovered devices: {devices}")

        print("Pretty")
        await device1.devices

if __name__ == "__main__":
    asyncio.run(start_bacnet_server())

answered Feb 25 at 15:10

Christian Tremblay

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