Regarding the connection between Bluetooth 5 center and peripherals

RE: Regarding the connection between Bluetooth 5 center and peripherals

xiang san — Fri, 12 Apr 2024 01:17:46 GMT

thank you !

Let me study it first！

RE: Regarding the connection between Bluetooth 5 center and peripherals

Edvin — Thu, 11 Apr 2024 10:18:33 GMT

I understand. In that case, you can use the connection handle to send data to a specific device. Please look at the ble_app_uart example, and how this uses ble_nus_data_send() to send data to the connected device. Even though this only supports one connection, it still uses the connection handle (m_conn_handle) to tell the Bluetooth stack where to send the message.

In your case, you will get callbacks whenever a device connects. This is the BLE_GAP_EVT_CONNECTED callback in ble_evt_handler. This event has the address of the device that just connected (Bluetooth address/MAC address), and it has a connection handle.

address: p_ble_evt->evt.gap_evt.params.connected.peer_addr.addr[N], N= 0 .. 5

connection handle: p_ble_evt->evt.gap_evt.conn_handle

You should store this connection handle, and use it later when you want to determine which device to send data to, or which device you received data from. The events after this only contains the connection handle, not the address. When the device disconnects (BLE_GAP_EVT_DISCONNECTED), you can remove that connection handle. It is not certain that the connection handle will be the same the next time the device connects.

Best regards,

Edvin

RE: Regarding the connection between Bluetooth 5 center and peripherals

xiang san — Thu, 11 Apr 2024 01:47:25 GMT

Hello,

The nRF5 SDK version I am using is 17.02, as you understand, which means that the central device acts as a Bluetooth gateway, and through some protocols and configurations (such as Bluetooth MAC address), the server data is only transmitted to the specified Bluetooth device;

thanks!

RE: Regarding the connection between Bluetooth 5 center and peripherals

Edvin — Wed, 10 Apr 2024 21:19:53 GMT

Hello,

What SDK version are you using? The nRF Connect SDK (NCS), or the nRF5 SDK?

What do you mean by: "I would like to have specified connection and disconnection devices"?

It sounds like what you are looking for is how to decide who you connect to, and how to disconnect from certain devices, is that so?

Best regards,

Edvin