Enabling/disabling LE Ping

[Youssif]

Hi

We have been able to set LE authenticated payload timeout via the following functions:-

ble_opt_t opt = {0};

opt.gap_opt.auth_payload_timeout.conn_handle = ValidHandle;
opt.gap_opt.auth_payload_timeout.auth_payload_timeout = 20;


retVal = sd_ble_opt_set(BLE_GAP_OPT_AUTH_PAYLOAD_TIMEOUT, &opt)

This successfully starts a timer which can cause the BLE_GAP_EVT_TIMEOUT event to be triggered if the timer expires without receiving a packet with a valid MIC. However, is there a way to disable this timer?

We are using nrf52 with softdevice S132 v3.0.0

Thanks

[Sigurd]

Hi,

It's not possible to turn off the timer. You can set the timer to min 10ms and max 8min, as documented here.

Note that the application don't need to take any actions on the event.

/* Ignore the authenticated payload timeout event */
case BLE_GAP_TIMEOUT_SRC_AUTH_PAYLOAD:
  break;

[Youssif]

Thanks for your response. So does sd_ble_opt_set(BLE_GAP_OPT_AUTH_PAYLOAD_TIMEOUT, &opt) start the timer or does the timer start when the softdevice is enabled?

[Sigurd]

The LE Ping procedure is started when encryption is enabled. A LL_PING_REQ packet will be sent to the other device. If the other device responds with a LL_PING_RSP packet the procedure is completed, and the timer is started.

If the other device responds with a LL_UNKNOWN_RSP packet, the other device does not support LE Ping, and the timer will not start.

[Youssif]

Awesome, thanks.