The connection of NRF52832 individual mobile phone models is not stable

[LuBei]

• Nrf52832 chip is used, and the software package is the “nRF5_SDK_16.0.0_98a08e2” version.

• According to customer feedback, Bluetooth connection is generally unstable at present, which is mainly manifested as follows: on the following specific mobile phone models, if we use our app to connect Bluetooth, it will be disconnected after 1-5 minutes of successful connection, while other models of mobile phones are normal。

  Mobile phones with unstable connection: SDK在iPhone X, iPhone 11, Samsung Galaxy S9

[Edvin]

Have you/the customer tried to sniff the connection? You can use the nRF Sniffer.

Have you/they tried to monitor the log fro the nRF52? What does it say? Does it have a disconnect event? Have you/they tried to check the disconnect reason?

Best regards,

Edvin

[LuBei]

• "Connection handle invalid" will be prompted when the connection is disconnected.

[LuBei]

断开提示：Disconnected from peer.

[Edvin]

LuBei said:

"Connection handle invalid" will be prompted when the connection is disconnected.

 ?

Can you share a screenshot of this?

[LuBei]

When you disconnect，Disconnected reason is 8。

[Edvin]

From ble_hci.h:

/** @defgroup BLE_HCI_STATUS_CODES Bluetooth status codes
 * @{ */

#define BLE_HCI_STATUS_CODE_SUCCESS                        0x00   /**< Success. */
#define BLE_HCI_STATUS_CODE_UNKNOWN_BTLE_COMMAND           0x01   /**< Unknown BLE Command. */
#define BLE_HCI_STATUS_CODE_UNKNOWN_CONNECTION_IDENTIFIER  0x02   /**< Unknown Connection Identifier. */
/*0x03 Hardware Failure
0x04 Page Timeout
*/
#define BLE_HCI_AUTHENTICATION_FAILURE                     0x05   /**< Authentication Failure. */
#define BLE_HCI_STATUS_CODE_PIN_OR_KEY_MISSING             0x06   /**< Pin or Key missing. */
#define BLE_HCI_MEMORY_CAPACITY_EXCEEDED                   0x07   /**< Memory Capacity Exceeded. */
#define BLE_HCI_CONNECTION_TIMEOUT                         0x08   /**< Connection Timeout. */

This means that one device either stops responding, or that they are out of range. 

[LuBei]

Edvin，Thank you very much.I am currently analyzing the data using nRF Sniffer.

Can I understand that the APP terminal has stopped sending the heartbeat data.We're using a broadcast connection now, no pairings.52832 to do slave machine

[LuBei]

• This is the LOG I grabbed with the NRF sniffer.

  

[Edvin]

Are the devices within range when they disconnect, or do you take them further apart before they disconnect?

What does the log on the nRF say when they disconnect?

[LuBei]

• The distance between the master and slave devices is only 2 meters

• 52832Disconnect LOG.pcapng

[Edvin]

I meant the log from the nRF52. Do you see any lines being printed from the NRF_LOG_INFO("log text"); either over UART or RTT? If so, does it say anything when you disconnect?