MacOS Bluetooth connnection problem

[leoc7]

Hi All,

My configuration:

• nrf52832 microcontroller
• Softdevice S132 V4.0.2
• Nordic SDK 13.0

I have problem with MacOS computer.

If I try to connect via BLE using a MacOS system, nrf52832 aborts connection and reboot automatically.

Instead, there are no problem if I connected to nrf52 with a windows system, android phone or iOS phone.

I'm using these values for GAP Configuration:

#define MIN_CONN_INTERVAL MSEC_TO_UNITS(15, UNIT_1_25_MS) 
#define MAX_CONN_INTERVAL MSEC_TO_UNITS(75, UNIT_1_25_MS)
#define SLAVE_LATENCY 0 
#define CONN_SUP_TIMEOUT MSEC_TO_UNITS(6000, UNIT_10_MS)

I'm using these values for Connection parameters:

#define FIRST_CONN_PARAMS_UPDATE_DELAY APP_TIMER_TICKS(5000) /**< 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) /**< Time between each call to sd_ble_gap_conn_param_update after the first call (30 seconds). */
#define MAX_CONN_PARAMS_UPDATE_COUNT 3

static void conn_params_init(void)
{
uint32_t err_code;
ble_conn_params_init_t cp_init;

memset(&cp_init, 0, sizeof(cp_init));

cp_init.p_conn_params = NULL;
cp_init.first_conn_params_update_delay = FIRST_CONN_PARAMS_UPDATE_DELAY;
cp_init.next_conn_params_update_delay = NEXT_CONN_PARAMS_UPDATE_DELAY;
cp_init.max_conn_params_update_count = MAX_CONN_PARAMS_UPDATE_COUNT;
cp_init.start_on_notify_cccd_handle = BLE_GATT_HANDLE_INVALID;
cp_init.disconnect_on_fail = false;
cp_init.evt_handler = on_conn_params_evt;
cp_init.error_handler = conn_params_error_handler;

err_code = ble_conn_params_init(&cp_init);
APP_ERROR_CHECK(err_code);
}

Error occurs here:

case BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST:
err_code = sd_ble_gatts_exchange_mtu_reply(p_ble_evt->evt.gatts_evt.conn_handle,  BLE_GATT_ATT_MTU_DEFAULT);
APP_ERROR_CHECK(err_code); //NB: return error code = 8 
break; 

It returns error code n. 8.

Could you help me please?

Thanks

[Sigurd]

Hi,

What example in the SDK are you testing? A reset indicates that you are running into the error handler, where the default behavior is to do a reset. You should then debug in order to find the reason for the reset. See this post about debugging.

[leoc7]

Hi,

Error occurs here:

case BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST:
err_code = sd_ble_gatts_exchange_mtu_reply(p_ble_evt->evt.gatts_evt.conn_handle,  BLE_GATT_ATT_MTU_DEFAULT);
APP_ERROR_CHECK(err_code); //NB: return error code = 8 
break; 

Error code nr. 8.

[Sigurd]

The error indicates that you are in a Invalid Connection State or that no ATT_MTU exchange request are pending.

Is this from a native SDK 13 example? or is it ported from SDK 12? Are you using the GATT Module (gatt_init()) ?

Also make sure that you have a "break;" in the switch case above BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST.

[leoc7]

This is my gatt_init():

static nrf_ble_gatt_t   m_gatt;   

/**@brief Function for initializing the GATT library. */
void gatt_init(void)
{
ret_code_t err_code;

err_code = nrf_ble_gatt_init(&m_gatt, NULL);
APP_ERROR_CHECK(err_code);

err_code = nrf_ble_gatt_att_mtu_periph_set(&m_gatt, 64);//64
APP_ERROR_CHECK(err_code);
}

Yes, I'm sure. Switch case is OK.

[Sigurd]

What happens if you comment out the nrf_ble_gatt_att_mtu_periph_set() function ?  Do you get the same behavior?

I.e.

void gatt_init(void)
{
ret_code_t err_code;

err_code = nrf_ble_gatt_init(&m_gatt, NULL);
APP_ERROR_CHECK(err_code);

//err_code = nrf_ble_gatt_att_mtu_periph_set(&m_gatt, 64);//64
//APP_ERROR_CHECK(err_code);
}

[leoc7]

Nothing change. Error 8 occurs.