Tx Power using SoftDevices S140 nrf52840

[TigerD]

Hi,

I am using SD calls to start an advertisement of BLE_GAP_ADV_TYPE_NONCONNECTABLE_NONSCANNABLE_UNDIRECTED :

          sd_ble_gap_adv_start(m_adv_handle, APP_BLE_CONN_CFG_TAG);

The call to set TX power:

err_code = sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_ADV ,  m_adv_handle, POS_08dBm);

m_adv_handle is BLE_GAP_ADV_SET_HANDLE_NOT_SET,

It seems that tx power is set not.

Questions:

1.  how to create a valid handle of m_adv_handle for the call through S140 SD?

2. If NULL handle, can be used, how to set tx power correctly?

Thank You,

David Zhou

[TigerD]

It is the same error 12292 from

err_code = sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_ADV, BLE_GAP_ADV_SET_HANDLE_NOT_SET, 8 )

BLE_CONN_HANDLE_INVALID is defined as 0xFF

BLE_GAP_ADV_SET_HANDLE_NOT_SET is defined as 0xFFFF

I guess there is no essential difference.

Thanks,

David

[haakonsh]

An error 12292dec corresponds with 0x3004. From the sd_ble_gap_tx_power_set API this is an BLE_ERROR_INVALID_ADV_HANDLE. 

The API docs for the 'handle' parameter' says:
If role is BLE_GAP_TX_POWER_ROLE_ADV, the advertising set identified with the advertising handle, will use the specified transmit power, and include it in the advertising packet headers if ble_gap_adv_properties_t::include_tx_power set.

I guess you've defined an advertising set when you set the advertisement data, you need to use this handle with sd_ble_gap_tx_power_set.

[TigerD]

I changed my program to use ble_advertising_start() to advertise. That solves my problem, because it has valid handle to set tx power.

Thank You,

David