Turning Bluetooth 'broadcast' off after sending

[toyotafj40]

Currently in the debug session of the code and want to restrict the number of packets being sent by BLE and displayed in the receiver.

The doco says 'broadcast=None' should stop the broadcast, but that's not what is happening...
The broadcast does stop as soon as I stop the program execution with F6 - Stop Everything or CityHub green button press.
The receiver also immediately stops displaying data, so this is not the sniffer repeatedly showing 'last seen' data. It does actually show last 'captured' data.

I would have thought this alone should stop the BLERadio
radio = BLERadio(broadcast_channel=None, observe_channels=[])

even adding this should 'destroy' the BLERadio
radio = None

This is a small test program to broadcast and then stop sending packets

from pybricks.hubs import CityHub
hub = CityHub()

from pybricks.tools import wait
from pybricks.messaging import BLERadio

while True:

    radio = BLERadio(broadcast_channel=62, observe_channels=[60])      

    data = bytes(
        [0x11, 
         0x22, 
         0x33])
    radio.broadcast(data)
    wait(100)

    data = bytes(
        [0, 
         0, 
         0])
    radio.broadcast(data)
    wait(100)

    radio = BLERadio(broadcast_channel=None, observe_channels=[])      
    radio = None
    
    wait(5000)

I expect to see small bursts of data then a 5 second gap.
Using the software parameters seems to be ineffective. Am I missing something?

This code was run on CityHub, Pybricks Code v3.0.1 with firmware v4.0.1

As a workaround, I am now simply changing 'broadcast=None', to 'broadcast=255' and sending the unwanted packets away.

[toyotafj40]

Turns out this works

radio.broadcast("")
radio = BLERadio(broadcast_channel=None, observe_channels=[]) 

[laurensvalk]

The doco says 'broadcast=None' should stop the broadcast

Where did you find that? That doesn't sound right, so we should update the docs.

The following should stop broadcasting:

radio.broadcast(None)

Did this not work?

You shouldn't have to restart the whole BLERadio.

[toyotafj40]

Sorry, I got confusedly between broadcast and broadcast channel. Regards Peter

…

On Mon, 24 Aug 2026, 4:03 pm Laurens Valk, ***@***.***> wrote: The doco says 'broadcast=None' should stop the broadcast Where did you find that? That doesn't sound right, so we should update the docs. The following should stop broadcasting: radio.broadcast(None) Did this not work? You shouldn't have to restart the whole BLERadio. — Reply to this email directly, view it on GitHub <#2794?email_source=notifications&email_token=CHL73RUIW7ARVRYWICASDA35LPLCHA5CNFSNUABIM5UWIORPF5TWS5BNNB2WEL2ENFZWG5LTONUW63SDN5WW2ZLOOQXTCOBRGMYDSMRWUZZGKYLTN5XKY43UMF2GKX3DNBQW4Z3FUVSXMZLOOSWGM33PORSXEX3DNRUWG2Y#discussioncomment-18130926>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/CHL73RSACWIC4ZXUODUI2ZL5LPLCHAVCNFSNUABIKJSXA33TNF2G64TZHMZDIOBYGAZTENJUHNCGS43DOVZXG2LPNY5TCMBWG42DANBZUF3AE> . Triage notifications, keep track of coding agent tasks and review pull requests on the go with GitHub Mobile for iOS <https://github.com/notifications/mobile/ios/CHL73RRS7KKB6F6WBZB6HOD5LPLCHA5CNFSNUABIM5UWIORPF5TWS5BNNB2WEL2ENFZWG5LTONUW63SDN5WW2ZLOOQXTCOBRGMYDSMRWUZZGKYLTN5XKY43UMF2GKX3DNBQW4Z3FUVSXMZLOOSVGM33PORSXEX3JN5ZQ> and Android <https://github.com/notifications/mobile/android/CHL73RWQAH6O5PE6WNDOWYT5LPLCHA5CNFSNUABIM5UWIORPF5TWS5BNNB2WEL2ENFZWG5LTONUW63SDN5WW2ZLOOQXTCOBRGMYDSMRWUZZGKYLTN5XKY43UMF2GKX3DNBQW4Z3FUVSXMZLOOSXGM33PORSXEX3BNZSHE33JMQ>. Download it today! You are receiving this because you modified the open/close state.Message ID: ***@***.***>