Central send notification to multiple peripherals

[Mike]

Hello,

Is it possible to send as central (and data server) one notification to all connected peripherals at once? Or is it necessary to send notification to every peripheral separately?

The thing is that Central has a service and characteristic with notification and Peripherals handle this characteristic. If something changed on Central it sends notification to all peripherals.

I use pc-ble-driver v0.5 with nRF51 dongle as central and write an application in C to handle multiple peripherals.

I am able to send notification to every peripheral separately using

sd_ble_gatts_hvx(p_dev->conn_handle, &hvx_params);

But if I try to use BLE_CONN_HANDLE_ALL like follows

sd_ble_gatts_hvx(BLE_CONN_HANDLE_ALL, &hvx_params);

I get error 0x3002 (BLE_ERROR_INVALID_CONN_HANDLE)

Mike

[Hung Bui]

Hi Mike,

Using BLE_CONN_HANDLE_ALL in sd_ble_gatts_hvx() is not a right way to use.

You need to call sd_ble_gatts_hvx() for each connection you have, can't use one function to send notification to all peripheral.

[Mike]

Ok, thank you for information. But is there any opportunity to send one notification to all peripherials at the same time?

[Hung Bui]

I don't think so. Each peripheral is connected with its own timing, its own connection interval. The notifications can never be sent at the same time.

[Mike]

Ok, Thank you