Loss HVN events when data rate is around 1kbps

RE: Loss HVN events when data rate is around 1kbps

Petter Myhre — Mon, 15 Feb 2016 13:57:10 GMT

Strange. Could you edit your question and include this information? And please use something else than .psd. I'm not able to open those files.

RE: Loss HVN events when data rate is around 1kbps

Teddy Yan — Mon, 15 Feb 2016 08:28:22 GMT

I used sniffer dongler to capture the connection intervals. most of intervals are 7.5 ms but there are some 60 ms intervals, maybe they causes lost HVN events. Please see attachment, but why did it happen? Could I do something to correct it?0160215162322.jpg

sniffer file: mobile phone work well. mobilePhone.psd

Nordic central device loss data. MyCentralDevice.psd

RE: Loss HVN events when data rate is around 1kbps

Teddy Yan — Wed, 10 Feb 2016 02:55:46 GMT

Thanks for Peter, let me check the two interval values. It seems the peripheral never sends BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST. This is unlike our other peripheral devices. But this peripheral can work with Android APP well(no any lost).

RE: Loss HVN events when data rate is around 1kbps

Petter Myhre — Tue, 09 Feb 2016 10:13:42 GMT

The minimum connection interval is 7.5 ms.

The S120 is capable of receiving one notification of 20 bytes in each connection interval.

So it is capable of receiving 133 notifications of 20 bytes per second.

Why you are only receiving 50 is difficult to answer, it would however match with a connection interval of 20 ms, not 7.5 ms. Are you sure you actually connection interval is 7.5 ms? You can check the connection interval with sniffer, or you can check it when you get the BLE_GAP_EVT_CONNECTED event, p_ble_evt->evt.gap_evt.params.connected.conn_params.min_conn_interval or p_ble_evt->evt.gap_evt.params.connected.conn_params.max_conn_interval. These will be equal.

RE: Loss HVN events when data rate is around 1kbps

Teddy Yan — Sun, 07 Feb 2016 11:59:22 GMT

the bitrate is 10 kbps