Power Profile Example Connection Interval Problem

RE: Power Profile Example Connection Interval Problem

Petter Myhre — Thu, 24 Nov 2016 13:41:44 GMT

The question in your second comment seems to be a duplicate of this, I suggest you reply to my comment there.

RE: Power Profile Example Connection Interval Problem

Petter Myhre — Thu, 24 Nov 2016 13:31:15 GMT

If the connection interval is 2s (and slave latency is 0) the central will send a packet to the peripheral every 2s, and the peripheral will reply to all of these packets (the reply can be empty packet). If you use a timer to send a notification every 5 second, and the connection interval is still 2s, the time since the central received the previos notification would be 4 or 6 seconds.

Most of our examples use the Connection Parameters Negotiation module, but you can also implement something yourself by following MSC I linked to in my answer.

RE: Power Profile Example Connection Interval Problem

garypty — Thu, 24 Nov 2016 06:53:18 GMT

I have tested to change the APP_CFG_CONNECTION_INTERVAL in the ble_app_pwr_profiling example to 1000 (that is 1000ms), but I found that it does not change anything when I test it with the Master Control Panel. I still receive notification every 20ms. Then if I change the connection interval in the Master Control Panel Option to 1000ms, I found that the received notification become 1000ms. So what is the usage to config APP_CFG_CONNECTION_INTERVAL in the example?

RE: Power Profile Example Connection Interval Problem

garypty — Wed, 23 Nov 2016 17:14:02 GMT

Having read your post, it seems a suitable connection interval is about 1-2s if considering to work with apple device. In this case, if I call power_manage(); in a infinity loop, and set up a RTC timer which triggered, for example, every 5s to send a notification. Will the nrf51 wake up at connection interval time (that is 1-2s) or it wake up every 5s when the RTC triggered? Also do you have an example about updating the connection parameter after service discovery?

RE: Power Profile Example Connection Interval Problem

Petter Myhre — Wed, 23 Nov 2016 09:07:02 GMT

Yes, but it is not that black & white, see this for more information.
Yes. That is a drawback of increaseing it. What you can do is to start off with a short interval, and then try to increase it by sending a CPU request to the central, after service discovery has completed.