How to deal with BLE_GATTS_EVT_SYS_ATTR_MISSING error?

RE: How to deal with BLE_GATTS_EVT_SYS_ATTR_MISSING error?

Vidar Berg — Wed, 05 Jul 2017 07:09:18 GMT

Depending on configuration, the connection parameter module may terminate the link if the central device does not accept a connection interval within your max/min range. Please check if .disconnect_on_fail parameter is set to false in conn_params_init().

RE: How to deal with BLE_GATTS_EVT_SYS_ATTR_MISSING error?

alivexiaoluo — Wed, 05 Jul 2017 02:52:25 GMT

Thanks,Vidar! I have already add the code above to on_ble_evt() function,but the disconnection between ios phone and device still exist. So the BLE_GATTS_EVT_SYS_ATTR_MISSING is not the reason of the disconnection. Disconnect Reason is 0x0016.(#define BLE_HCI_LOCAL_HOST_TERMINATED_CONNECTION 0x16 /**< Local Host Terminated Connection. */ in ble.hci.h) I have found the connection between ios phone and device established,the device try to update connection parameters.after 3(#define MAX_CONN_PARAMS_UPDATE_COUNT 3) timers,the disconnection occurs.I doubt connection parameters update is the reason of this disconnection. how the connection parameter update event occurs during connection establishment? Both IOS phone and Android phone will update connection parameter.

RE: How to deal with BLE_GATTS_EVT_SYS_ATTR_MISSING error?

Vidar Berg — Tue, 04 Jul 2017 11:34:40 GMT

BLE_GATTS_EVT_SYS_ATTR_MISSING is typically handled inside the peer manager / device manager module (sys att are store persistently when bonded). Add the following to code to your on_ble_evt() handler if you are not using either of these modules :

    case BLE_GATTS_EVT_SYS_ATTR_MISSING:
        // No system attributes have been stored.
        err_code = sd_ble_gatts_sys_attr_set(m_conn_handle, NULL, 0, 0);
        APP_ERROR_CHECK(err_code);
        break; // BLE_GATTS_EVT_SYS_ATTR_MISSING