BLE packets retrying

RE: BLE packets retrying

Hung Bui — Fri, 23 Dec 2016 12:01:27 GMT

I'm glad you found the issue MC :)

RE: BLE packets retrying

MC — Fri, 23 Dec 2016 09:55:51 GMT

You wrote your comment as I was writing my answer :) The issue was indeed latency setting to 3.

RE: BLE packets retrying

Hung Bui — Fri, 23 Dec 2016 09:48:57 GMT

Hi MC,

Are you sure you use the S120 ? What I can see in the trace is that the phone is the central and your device is the peripheral. Usually S120 is to be used as central.

From the trace it looks more like the slave is having the setting of slave latency = 3 , it sleeps for 3 connection interval before waking up to receive packet from the central. But it could also be due to the interference or bad antenna design causing packet missing.

Which SDK you are using ? And which Softdevice version ? You can try to test through put with our example in the SDK, for example the ble_app_uart, you then would need to modify the app to send data as fast as possible.

RE: BLE packets retrying

MC — Fri, 23 Dec 2016 09:48:32 GMT

I figured it out by myself, the problem was connection parameters settings. I've set slave latency to 3, which in fact caused the S120 to "sleep" for up to 3 consecutive intervals, but at the same time, smartphone was trying to send the data, but had no response from S120. This answers my question.