Disconnection after BLE_GAP_EVT_LESC_DHKEY_REQUEST error 19 (0x13)

[Arepa]

Hi all,

after call inside the BLE_GAP_EVT_LESC_DHKEY_REQUEST I got error 8, what can cause it? a CONNECTION_SUPERVISED_TIMEOUT? 

		static nrf_value_length_t peer_public_key_raw = { 0 };

		peer_public_key_raw.p_value = &p_ble_evt->evt.gap_evt.params.lesc_dhkey_request.p_pk_peer->pk[0];
		peer_public_key_raw.length = BLE_GAP_LESC_P256_PK_LEN;

		error = nrf_crypto_ecc_public_key_from_raw(NRF_CRYPTO_BLE_ECDH_CURVE_INFO,
			&peer_public_key_raw,
			&m_peer_public_key);
		APP_ERROR_CHECK(error);
		NRF_LOG_INFO("nrf_crypto_ecc_public_key_from_raw %d\r\n", error);

		error = nrf_crypto_ecdh_shared_secret_compute(NRF_CRYPTO_BLE_ECDH_CURVE_INFO,
			&m_private_key,
			&m_peer_public_key,
			&m_dh_key);
		APP_ERROR_CHECK(error);
		NRF_LOG_INFO("nrf_crypto_ecdh_shared_secret_compute %d\r\n", error);

		error = sd_ble_gap_lesc_dhkey_reply(connectionhandle, &m_lesc_dh_key);
		APP_ERROR_CHECK(error);
		NRF_LOG_INFO("sd_ble_gap_lesc_dhkey_reply %d\r\n", error);

device nRF52, SDK13

Thanks

[Edvin]

Commenting out all sd_ble_gap_disconnect()s will not keep the devices connected. One device will disconnect if the other one e.g. stops responing.

Could you zoom a bit out on the sniffer log?

It says that the slave sends the disconnect message. What device are you trying to connect the nRF to? Is it a phone or another nRF (e.g. with nRF Connect for Desktop)?

Would it be possible to send the entire project instead of the snippet? Or something that I can reproduce the error with?

[Arepa]

Hey Ed, I think I found the problem, but it is still very disconcerting.... how I said above I am getting random disconnections since the connection is established I am always getting disconnection reason 0x19[BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION]

If I change the values for MIN_CONN_INTERVAL and MAX_CONN_INTERVAL to bigger numbers it does not happen anymore, for example, I was working with MIN_CONN_INTERVAL =7.5 and MAX_CONN_INTERVAL =25 and I was getting random disconnections. I changed the values respectively to 100 and 200 and it is now working fine.

What could be the cause of this behavior?