Reset in nRF51 SDK v10 BLE Keyboard HIDS Example

RE: Reset in nRF51 SDK v10 BLE Keyboard HIDS Example

sam — Tue, 03 May 2016 03:01:04 GMT

Hi Dgutierrez,

I set the "erase_bonds" to false and the problem is solved, after hardware reset my BLE still can send notification to central, thanks very much.. If I have any questions I will let you know.

Sam

RE: Reset in nRF51 SDK v10 BLE Keyboard HIDS Example

dgutierrez — Fri, 29 Apr 2016 16:02:18 GMT

Sure thing.

RE: Reset in nRF51 SDK v10 BLE Keyboard HIDS Example

sam — Fri, 29 Apr 2016 16:01:23 GMT

let me try and let you know..thank very much..

RE: Reset in nRF51 SDK v10 BLE Keyboard HIDS Example

dgutierrez — Fri, 29 Apr 2016 15:59:38 GMT

Yep. In my case it was uninitialized cause we have some custom code there but the symptoms were the same. Since the struct only has the member

typedef struct
{
    bool clear_persistent_data; /**< Set to true in case the module should clear all persistent data. */
} dm_init_param_t;

the example code takes care of that.

static void device_manager_init(bool erase_bonds)
{
    uint32_t               err_code;
    dm_init_param_t        init_param = {.clear_persistent_data = erase_bonds};
    dm_application_param_t  register_param;

The behavior was then that bonds were being cleared when they shouldn't have been.

RE: Reset in nRF51 SDK v10 BLE Keyboard HIDS Example

sam — Fri, 29 Apr 2016 15:56:10 GMT

Hi Dgutierrez,

in "device_manager_init() ", i need to initial both dm_init_param_t and dm_application_param_t structs to zero?

Thanks, Sam

RE: Reset in nRF51 SDK v10 BLE Keyboard HIDS Example

dgutierrez — Fri, 29 Apr 2016 15:52:12 GMT

The fix for not connecting after 15 minutes was that the nRF chip went to sleep and stopped advertising, so I just started advertising on a button press when idle and it worked again. Another option is to reset on the button press which also started advertising again. Note that the example code calls sd_power_system_off() when it has gone through all of the advertising stages without finding a central to connect to.

RE: Reset in nRF51 SDK v10 BLE Keyboard HIDS Example

sam — Fri, 29 Apr 2016 15:51:54 GMT

Hi Dgutierrez,

Thanks for that, I will try and see if works for me.

Sam

RE: Reset in nRF51 SDK v10 BLE Keyboard HIDS Example

sam — Fri, 29 Apr 2016 15:48:02 GMT

Hi Dgutierrez,

Thanks for that, does that setting fix your "if Bluetooth is turned off (same method) for about 15 minutes then enabled again, the peripheral connects but the HIDS doesn't work" problem? I've tried many ways but all fails..

Thanks, Sam

RE: Reset in nRF51 SDK v10 BLE Keyboard HIDS Example

dgutierrez — Fri, 29 Apr 2016 15:47:04 GMT

Also had another bug where in device_manager_init() I was using the dm_init_param_t and dm_application_param_t structs uninitialized, that caused weird behavior with the same symptoms - board reset, connected to iOS but the HIDS wasn't working. Initializing those structs to 0 (struct = {0};) fixed that problem.

RE: Reset in nRF51 SDK v10 BLE Keyboard HIDS Example

dgutierrez — Fri, 29 Apr 2016 15:44:56 GMT

Try removing the whitelist. That was causing problems for me.

RE: Reset in nRF51 SDK v10 BLE Keyboard HIDS Example

dgutierrez — Fri, 29 Apr 2016 15:43:39 GMT

There are straight from the HIDS keyboard example and work for me:

#define MIN_CONN_INTERVAL                MSEC_TO_UNITS(7.5, UNIT_1_25_MS)               /**< Minimum connection interval (7.5 ms) */
#define MAX_CONN_INTERVAL                MSEC_TO_UNITS(30, UNIT_1_25_MS)                /**< Maximum connection interval (30 ms). */
#define SLAVE_LATENCY                    6                                              /**< Slave latency. */
#define CONN_SUP_TIMEOUT                 MSEC_TO_UNITS(430, UNIT_10_MS)                 /**< Connection supervisory timeout (430 ms). */

#define FIRST_CONN_PARAMS_UPDATE_DELAY   APP_TIMER_TICKS(5000, APP_TIMER_PRESCALER)     /**< Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (5 seconds). */
#define NEXT_CONN_PARAMS_UPDATE_DELAY    APP_TIMER_TICKS(30000, APP_TIMER_PRESCALER)    /**< Time between each call to sd_ble_gap_conn_param_update after the first call (30 seconds). */
#define MAX_CONN_PARAMS_UPDATE_COUNT     3                                              /**< Number of attempts before giving up the connection parameter negotiation. */

RE: Reset in nRF51 SDK v10 BLE Keyboard HIDS Example

sam — Fri, 29 Apr 2016 15:21:03 GMT

Hi,

Any hint to change the connection parameter? Actually i have another problem, I'm working on a HID keyboard plus BLS(button led service) project, if i hit the hardware reset button of the DK board, my device will connect back with iOS, but the button service is not working anymore, i search the forum and found i need to enable the "notification" service to my device, but have no idea how, any help?

Thanks, Sam

RE: Reset in nRF51 SDK v10 BLE Keyboard HIDS Example

dgutierrez — Fri, 29 Apr 2016 15:15:51 GMT

Sam,

Did you try varying connection parameters at all?

RE: Reset in nRF51 SDK v10 BLE Keyboard HIDS Example

sam — Fri, 29 Apr 2016 02:07:37 GMT

Hi,

I have exact the same problem, I'm having SDK 9.0's reset problem and according to this, the reset is fixed in SDK 11.0, so i changed to SDK11.0 and try again. But here's comes another problem, with SDK11.0, only iOS8.4 is able to discover the nordic_keyboard and paired, both iOS7.4 and iOS9.3.1 have problems, iOS7 can't discover ti and iOS9.3 is able to discover but fail to paired with it. Can anyone help? Any help will be appreicated!!

Thanks,

RE: Reset in nRF51 SDK v10 BLE Keyboard HIDS Example

dgutierrez — Thu, 18 Feb 2016 16:05:56 GMT

Thanks Petter.

RE: Reset in nRF51 SDK v10 BLE Keyboard HIDS Example

Petter Myhre — Thu, 18 Feb 2016 13:27:58 GMT

Good that you found the fix in SDK 11, I wasn't aware of this bug. The function will return an error if the peer device uses random resolvable address, like iOS does.

if Bluetooth is turned off (same method) for about 15 minutes then enabled again, the peripheral connects but the HIDS doesn't work

I tried to reproduce this, but I couldn't. I connected and bonded, then turned off Bluetooth on iOS. Then I waited for 17 minutes. Turned on Bluetooth on iOS, it connected, and the HID keyboard worked fine. Does this happen every time? Do you have access to a sniffer so we can see what is happening on air?

if the iPad forgets the peripheral and then I try to connect to it using another central device, it fails to connect

The unmodified example will limit the number of bonds to 1. See #define DEVICE_MANAGER_MAX_APPLICATIONS 1 in device_manager_cnfg.h. Even though you delete the bond on iOS it will still exist in the nRF51, so you need to either allow more devices to bond to the nRF51, or delete the bond before another central is allowed to bond.

RE: Reset in nRF51 SDK v10 BLE Keyboard HIDS Example

dgutierrez — Mon, 15 Feb 2016 20:44:43 GMT

Hi Petter, I edited the question with the additional information and files. Looking forward to your response. Thanks

RE: Reset in nRF51 SDK v10 BLE Keyboard HIDS Example

Petter Myhre — Mon, 15 Feb 2016 14:49:22 GMT

I can't see how your changes would make this happen. It works fine with the unmodified example? Could you upload the complete project instead? It is a bit easier to test. You are using SDK 10.0.0 with SoftDevice S110 right?