More trouble with changing BLE connection interval

RE: More trouble with changing BLE connection interval

FormerMember — Wed, 02 Aug 2017 14:13:21 GMT

Perhaps looking at the source code for one of the Nordic iOS apps can give you an idea on how to change/accept/obtain different connection intervals i iOS?

RE: More trouble with changing BLE connection interval

Thu, 27 Jul 2017 13:08:30 GMT

I've never seen it establish any connection interval that is not 24, so I think there's something else that is wrong. Surely others with an iphone are able to change the connection interval. I will do some more debugging once I get another dev board and combine it with a bluetooth sniffer. I'll post pack in a couple days with more info and/or a solution.

RE: More trouble with changing BLE connection interval

FormerMember — Thu, 27 Jul 2017 09:33:22 GMT

I don't think there is any way to force iOS to accept some connection parameters. One technique is to gradually increase the connection interval and see when iOS will accept the new connection interval.

RE: More trouble with changing BLE connection interval

Wed, 26 Jul 2017 14:19:28 GMT

It turns out my application was triggering a disconnect by calling sd_ble_gap_disconnect() within on_conn_params_evt(), which was receiving an event BLE_CONN_PARAMS_EVT_FAILED. I am not getting the disconnect error anymore after commenting out sd_ble_gap_disconnect(). However, it seems clear now that the connection params event is failing...the question is why. Any insights? I believe that all of the conn_params that I've picked are reasonable and stick to the Apple defined specifications.

RE: More trouble with changing BLE connection interval

FormerMember — Wed, 26 Jul 2017 13:30:34 GMT

When wanting to update the connection parameters from a peripheral, the peripheral sends a "connection parameter update request" to the central. The central has three options when it receives a "connection parameter update request": Accept, reject, or ignore.

In either case, the result from the "connection parameter update request" should be reflected by the connection parameters in the event BLE_GAP_EVT_CONN_PARAM_UPDATE, see this message sequence chart.

The error code 22 = 0x16 = BLE_HCI_LOCAL_HOST_TERMINATED_CONNECTION

Is it possible that it is your application that is triggering a disconnect, by calling sd_ble_gap_disconnect()?