disconnect reason 0x8

[cjzhao]

• When I use this example:ble_central\ble_app_uart_c   (SDK_17.0.2  S132  nrf52832)  

• It disconnects every few seconds and reason 0x8.  
• LOG :

  <info> app: conn_Param Update Request

  <info> app: conn_Param Update: 12,12,0,200

  <info> app: Disconnected.

  <debug> ble_scan: Scanning

  <info> app: Disconnected. conn_handle: 0x0, reason: 0x8

• These Log Printed by
• case BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST:
  // Accepting parameters requested by peer.
  NRF_LOG_INFO("conn_Param Update Request");
  err_code = sd_ble_gap_conn_param_update(p_gap_evt->conn_handle,
  &p_gap_evt->params.conn_param_update_request.conn_params);
  APP_ERROR_CHECK(err_code);
  break;
• case BLE_GAP_EVT_CONN_PARAM_UPDATE:
  NRF_LOG_INFO("conn_Param Update: %d,%d,%d,%d",
  p_ble_evt->evt.gap_evt.params.conn_param_update.conn_params.min_conn_interval,
  p_ble_evt->evt.gap_evt.params.conn_param_update.conn_params.max_conn_interval,
  p_ble_evt->evt.gap_evt.params.conn_param_update.conn_params.slave_latency,
  p_ble_evt->evt.gap_evt.params.conn_param_update.conn_params.conn_sup_timeout
  );
  break;

• case BLE_GAP_EVT_DISCONNECTED:

  NRF_LOG_INFO("Disconnected. conn_handle: 0x%x, reason: 0x%x",
  p_gap_evt->conn_handle,
  p_gap_evt->params.disconnected.reason);
  break;

• If I don't call sd_ble_gap_conn_param_update when BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST event occerd,It will not disconnect and work good. 

[Sigurd]

Hi,

It disconnects every few seconds and reason 0x8

 Reason 8 is BLE_HCI_CONNECTION_TIMEOUT (Connection Timeout).

What device are you connected to? Do you have any logs from the device you connected to?

[cjzhao]

I connected another serial port passthrough module and I couldn't get its logs. If I don't respond to its CONN_PARAM_UPDATE_REQUEST event, I won't be disconnected. Can I use it this way? Will it cause other problems?

[Sigurd]

Could you capture a sniffer log?

If you have extra DK or dongle, you can use nRF Sniffer: https://www.nordicsemi.com/Products/Development-tools/nRF-Sniffer-for-Bluetooth-LE