Close the existing BLE connection.

RE: Close the existing BLE connection.

Vidar Berg — Wed, 17 Dec 2025 07:53:28 GMT

Thanks for the update. Please create a separate thread about adjusting the connection parameters and include information about what you want to optimise for. When selecting connection parameters you usually need to consider the tradeoffs (latency, power consumption, multi link scheduling, etc)

RE: Close the existing BLE connection.

carefree — Wed, 17 Dec 2025 07:46:29 GMT

Thank you. In fact, I also discovered that I had called the bt_conn_disconnect function multiple times, which triggered this issue.
Additionally, I have a small issue. I found a code for multi-device connection, but this code is only for the central device side. Since I want to optimize my Bluetooth connection parameters, but I haven't found the corresponding Bluetooth parameters for the peripheral devices, do you have any good suggestions?
sdk-zephyr/samples/bluetooth/central_multilink at v4.0.99-ncs1 · nrfconnect/sdk-zephyr

RE: Close the existing BLE connection.

Vidar Berg — Wed, 17 Dec 2025 07:34:04 GMT

Hello,

In the central role, the application is responsible for releasing its connection object reference both on connection failure and on disconnect in order to allow the connection to be "released" after it has been terminated.

bt_conn_unref() should only be called in these 2 places (assuming you don't have any additional calls to bt_conn_ref()):

https://github.com/zephyrproject-rtos/zephyr/blob/09b89ef585d8ebba5fcb672b30cb670dd0f31772/samples/bluetooth/central_hr/src/main.c#L185

https://github.com/zephyrproject-rtos/zephyr/blob/09b89ef585d8ebba5fcb672b30cb670dd0f31772/samples/bluetooth/central_hr/src/main.c#L222

Best regards,

Vidar

RE: Close the existing BLE connection.

carefree — Mon, 15 Dec 2025 16:11:17 GMT

This situation occurs relatively infrequently, but once it happens, the peripheral device will be unable to reconnect. The code in this section is almost the same as what I asked about last time:BLE doesn't work. - Nordic Q&A - Nordic DevZone - Nordic DevZone