DBus.Error.AccessDenied

[ThomasJF]

• bleak version: 0.22.2
• Python 3.9.2:
• Raspian Bullseye

Error Message:
python bluetooth org.freedesktop.DBus.Error.AccessDenied] Client tried to send a message other than Hello without being registered

Here is what I do:

adr="34:B7:DA:65:4C:F9"                                                                                   # Device Address
device_control_ZERO = "adbc045e-09e8-4332-ae0f-1f9dd87b4f4d"               # UUID for ZERO indicator (true or false). 
device_control_COMMAND= "908d8f21-4fda-4954-a5aa-fb94c521a5ee"       # UUID for Command and response

async def Read_Ping():
    global adr,device_control_COMMAND,device_control_ZERO
    async with BleakClient(adr) as client:
        print("Ping. Connected: ",client.is_connected)
        await client.write_gatt_char(device_control_COMMAND, b"Ping", response=False)
        data = await client.read_gatt_char(device_control_COMMAND)        
        print("Response: ",data)
        data = await client.read_gatt_char(device_control_ZERO)
        print("ZERO: ",data)

def MyThread():
    global StopRequest,Start,Online
    print("\n Thread Started!")
    while True:
        try:
            while Start!="TRUE":
                if StopRequest!=0: raise ExitRequest
                try:           
                    print("Ping!")
                    asyncio.run(Read_Ping()) # Check Device is online by run Ping. If the function returns, Device is OK 
                    Online=True
                    print("Online=",Online,"  Start=",Start)
                    pass  
                except Exception as e:
                    Online=False
                    print("Device is Offline ",e)
                    pass
                if StopRequest!=0: break
                time.sleep(3)
               
        #Start working cycle
        Start="FALSE"
        print("Device is available")

The thread is an endless Loop. When "Start" is set, it does on cycle of work and then hangs around agin pinging the device.
Now this works for a long time (hours), but at a certain time the program starts to display the error message:
"Client tried to send a message other than Hello without being registered".
So far I did not find out when and under what condition the code stops working.
When I kill the program and restart it, the thing works again.
Any clue what goes on? Thank you.
Thomas

[dlech]

Bleak does not support calling asyncio.run() multiple times. Please rewrite your thread to only call that once so that the asyncio event loop is always running for the entire lifetime of your application.

[ThomasJF]

Tank you very much for your quick answer.

…

________________________________ From: David Lechner ***@***.***> Sent: Monday, September 30, 2024 3:53:45 PM To: hbldh/bleak ***@***.***> Cc: ThomasJF ***@***.***>; Manual ***@***.***> Subject: Re: [hbldh/bleak] DBus.Error.AccessDenied (Issue #1647) Bleak does not support calling asyncio.run() multiple times. Please rewrite your thread to only call that once so that the asyncio event loop is always running for the entire lifetime of your application. — Reply to this email directly, view it on GitHub<#1647 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AEE4US3H4ZQ4MX4XUKUNLBTZZFJWTAVCNFSM6AAAAABPC7KXP6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDGOBTGI3DGMZRHE>. You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>