Changing the transmission power on ble_app_att_mtu_throughput example

RE: Changing the transmission power on ble_app_att_mtu_throughput example

Joakim Jakobsen — Mon, 24 Feb 2020 08:13:37 GMT

Thanks for sharing your solution!

Best regards,
Joakim

RE: Changing the transmission power on ble_app_att_mtu_throughput example

Ben — Fri, 21 Feb 2020 13:28:08 GMT

Hi,

I resolved the issue by changing:

case BLE_GAP_EVT_CONNECTED:
err_code = sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_CONN, BLE_CONN_HANDLE_INVALID, RADIO_TX_POWER);
on_ble_gap_evt_connected(p_gap_evt);
break;

case BLE_GAP_EVT_CONNECTED:
m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
err_code = sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_CONN, m_conn_handle, RADIO_TX_POWER);
APP_ERROR_CHECK(err_code);

on_ble_gap_evt_connected(p_gap_evt);

break;

The problem was in passing the correct connection handle to "sd_ble_gap_tx_power_set" function in connection state.

Br,

Ben

RE: Changing the transmission power on ble_app_att_mtu_throughput example

Ben — Tue, 18 Feb 2020 08:42:30 GMT

Hi Joakim,

Yes, I have seen that answer. It did not help. It is strange. Perhaps I am doing some silly mistake.

I have compared the throughput example and the long-range example. I can not figure it out why it throws Fatal error.

These are the places that I have used "sd_ble_gap_tx_power_set" functtion in the code:

....

case BLE_GAP_EVT_CONNECTED:
err_code = sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_CONN, BLE_CONN_HANDLE_INVALID, RADIO_TX_POWER);

on_ble_gap_evt_connected(p_gap_evt);
sd_ble_gap_rssi_start(p_ble_evt->evt.gap_evt.conn_handle, 1, 1); //added by _OP
APP_ERROR_CHECK(err_code);
break;

.....

/**@brief Function for starting advertising. */
static void advertising_start(void)
{
NRF_LOG_INFO("Starting advertising.");

ret_code_t err_code = sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_ADV, m_adv_handle, RADIO_TX_POWER);
APP_ERROR_CHECK(err_code);

bsp_board_led_on(SCAN_ADV_LED);
err_code = sd_ble_gap_adv_start(m_adv_handle, APP_BLE_CONN_CFG_TAG);
APP_ERROR_CHECK(err_code);

}

........

/**@brief Function for starting the scanning. */
static void scan_start(void)
{
NRF_LOG_INFO("Starting scanning.");
ret_code_t err_code = sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_SCAN_INIT, BLE_CONN_HANDLE_INVALID, RADIO_TX_POWER);
APP_ERROR_CHECK(err_code);
bsp_board_led_on(SCAN_ADV_LED);

err_code = nrf_ble_scan_start(&m_scan);
APP_ERROR_CHECK(err_code);
}

........

Thanks for the help.

Br,

Ben

RE: Changing the transmission power on ble_app_att_mtu_throughput example

Joakim Jakobsen — Tue, 18 Feb 2020 08:23:59 GMT

Hi Ben.

Have you seen the answer from my colleague Bjørn in this previous ticket:

https://devzone.nordicsemi.com/f/nordic-q-a/36531/how-do-you-set-tx-power-for-all-power-roles

Best regards,
Joakim