Consumption reduction with slave latency

RE: Consumption reduction with slave latency

Torsten Robitzki — Thu, 03 Sep 2015 13:04:48 GMT

Can you sniff the protocol?

RE: Consumption reduction with slave latency

Dave_couling — Wed, 02 Sep 2015 19:15:12 GMT

correct, but your initial call to the update function still returns NRF_SUCCESS.

Also, Nordic would need to confirm, but the Central could in effect ignore your update settings and not cause a disconnect. Since the phones default settings still satisfy your current settings with a 30ms Internal. Hence please try the settings I suggested to see if you see a proper update.

RE: Consumption reduction with slave latency

andrey — Wed, 02 Sep 2015 18:25:49 GMT

iPhone 5S, iOS 8.4. Using wrong connection parameters in ble_conn_params_change_conn_params() does lead to a disconnect as expected.

RE: Consumption reduction with slave latency

Dave_couling — Wed, 02 Sep 2015 18:10:23 GMT

What version of iPhone and iOS?

Try: Min: 300 Max: 450 SL: 3 ST: 2000

Just to see if you accepts. The ones you are currently trying are close to the default settings, thus iOS may ignore them. The function should always return NRF_SUCCESS but that doesn't indicate that the Central actually accepts and implements the update.

RE: Consumption reduction with slave latency

andrey — Wed, 02 Sep 2015 18:03:24 GMT

Not as a part of this test, no.

RE: Consumption reduction with slave latency

Dave_couling — Wed, 02 Sep 2015 18:00:02 GMT

Do you have any characteristics that the Central subscribes to notifications for?

RE: Consumption reduction with slave latency

andrey — Wed, 02 Sep 2015 17:58:42 GMT

5 seconds.

RE: Consumption reduction with slave latency

Dave_couling — Wed, 02 Sep 2015 17:57:04 GMT

What is the timeout setting for the FIRST_CONN_PARAMS_UPDATE_DELAY?

RE: Consumption reduction with slave latency

Stefan Birnir Sverrisson — Wed, 02 Sep 2015 09:39:51 GMT

Hi andrey

When it comes to IOS, there are certain rules you must follow, see this document on page 22 about connection parameters.

Initially, connection is initiated by the central device and connection parameters are set by the central device. In order to change the connection parameters, e.g. the slave latency, the peripheral must send a Connection Parameter Update Request to the central. If the guidelines are not followed, the IOS device might not accept the update request.