Disconection occured in a random way[Reason : BLE_HCI_CONNECTION_TIMEOUT]

[Mehdi]

Hi,

I'm interfacing acceleration via BLE using NRF52.

I'm using timer to get the sensor value and update the characteristic value related to this sensor using sd_ble_gatts_hvx every timeout_ticks value configured in app_timer_start API.

When i set timeout_ticks above 500 ms, the BLE works corrcetly, in the opposite case, a disconnection event occured in a random way with the following reason : BLE_HCI_CONNECTION_TIMEOUT.

Thank you in advance.

[Petter Myhre]

I'm not sure what is causing this, would it be possible for your to share your complete project so I can try to reproduce here? What SDK and SoftDevice version are you using?

[Mehdi]

Hi Peter, thanks for the answer. My project is based on SDK14 exemples. I'm using softdevice s132 on nRF52. To get and update over sd_ble_gatts_hvx the acceleration value, i'm using the following steps :

1. Create new timer :

 err_code = app_timer_create(&m_acceleration_mesurement_id,  APP_TIMER_MODE_REPEATED, acceleration_sample_handler);

2. Start timer when BLE_GAP_EVT_CONNECTED occured in ble_evt_handler API in the main file:

   case BLE_GAP_EVT_CONNECTED:
      app_timer_start(m_acceleration_mesurement_id, ACCELERATION_SAMPLE_TIME, NULL);
       m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
       break;
   

3.Every ACCELERATION_SAMPLE_TIME value the following scenario will be executed :

       GetAcceleration
       acceleration_update

When ACCELERATION_SAMPLE_TIME above 500ms, the BLE operate correctly. Thx

[Mehdi]

Sorry i can't share the complete project

[Petter Myhre]

Could you share the complete project privately through your MyPage at nordicsemi.com?

Which interrupt priority are you running RTC1 at? It is probably using APP_TIMER_CONFIG_IRQ_PRIORITY

What exactly are you doing in acceleration_sample_handler()?

[Mehdi]

Hi Peter, The interrupt priority i'm running at RTC1 is 7.

below, the treatment performed in acceleration_sample_handler() :

	Acc_Value AccData;
	static uint32_t err_code = NRF_SUCCESS;

  memset(&AccData, 0, sizeof(Acc_Value));
  readAcc(&AccData);
	
	err_code = ble_accs_acceleration_update(&m_accs, (uint8_t*)(&AccData));	
	   
	APP_ERROR_CHECK(err_code);

I can't share the complete project but i can send you the main.c and board_definition.c if you want.

Thank you