how to use sd_ble_gatts_service_changed()https://devzone.nordicsemi.com/f/nordic-q-a/13716/how-to-use-sd_ble_gatts_service_changedAfter updating an application on nRF51822 chip with a new application which has new Characteristic UUID via BLE, iOS app cannot detect the new Characteristic UUID. I know iOS device uses cache态so nRF51822 has to enable service changed characteristicen-USTelligent Community 13Wed, 11 May 2016 11:52:46 GMTRE: how to use sd_ble_gatts_service_changed()https://devzone.nordicsemi.com/thread/52426?ContentTypeID=1Wed, 11 May 2016 11:52:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7e10df98-54c7-438f-b57f-4a1ffd7e2f7arun_ar<p>Could you capture an sniffer trace showing the initial bond so I can verify that service changed was actually enabled by the peer. Invalid state means that you are in an invalid connection state (not connected) or that indications was not enabled. Which softdevice version are you using (should be S110 v8 or a newer softdevice)?</p><div style="clear:both;"></div>RE: how to use sd_ble_gatts_service_changed()https://devzone.nordicsemi.com/thread/52425?ContentTypeID=1Tue, 10 May 2016 10:26:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c28209d6-1764-4465-b423-2efc9abda13cHaruki Kawakami<p>the version I use is 8.1.3. yes I know that. but sd_ble_gatts_service_changed on BLE_GAP_EVT_CONN_SEC_UPDATE event return NRF_ERROR_INVALID_STATE.</p><div style="clear:both;"></div>RE: how to use sd_ble_gatts_service_changed()https://devzone.nordicsemi.com/thread/52424?ContentTypeID=1Tue, 10 May 2016 09:36:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bf20d27a-d492-4e8b-9be8-e792cd14ee6erun_ar<p>Which iOS version is this? And do you know if service changed indications was actually enabled in the first place?</p><div style="clear:both;"></div>RE: how to use sd_ble_gatts_service_changed()https://devzone.nordicsemi.com/thread/52423?ContentTypeID=1Tue, 10 May 2016 09:32:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:663520b3-b746-41fe-a392-f726a9fb0455Haruki Kawakami<p>run_ar yes, the service was present. so I&#39;m worried...</p><div style="clear:both;"></div>RE: how to use sd_ble_gatts_service_changed()https://devzone.nordicsemi.com/thread/52422?ContentTypeID=1Tue, 10 May 2016 09:30:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a5fec314-a6d3-4c65-a25b-bcd8867e7176run_ar<p>Was the service changed characteristic present when you first connected to the iOS device? If you added this later on when you altered the attribute table, iOS won&#39;t know about the service changed characteristic either.</p><div style="clear:both;"></div>