Please inquire about the use of sd_ble_gap_tx_power_set.

[alex kim]

Hi,

I am using 

• nRF52840
• SDK 15.3.0
• Keil IDE
• The soft device is S140 
• JLinkRTTViewer for debug

I set tx power in advertising as below.

sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_ADV, m_advertising.adv_handle, 4);  

When connected to a smartphone, is the tx power set in advertising maintained?

If not maintained, what value is tx power set in the connected state?

If you want to maximize tx power while connected, can you set it as below?

sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_CONN, m_conn_handle, 4);

please advice

Alex

[Mttrinh]

Hi,

I suggest you have a look at Einar's answer in this thread.

[alex kim]

Hi,

I read the thread you recommended. In summary, it is as follows.

In the peripheral, if I specify a value for (BLE_GAP_TX_POWER_ROLE_ADV),
the Tx power is set to the specified value in both the advertisement and the connected state.

In central, if I specify a value for (BLE_GAP_TX_POWER_ROLE_SCAN_INIT),
Tx power is set to the specified value in the connected state.

Is it correct what I understood?

[Mttrinh]

Yes, that is correct.

[alex kim]

Hi,

Thank you very much