Softdevice - need to call sd_ble_gap_tx_power_set() separately to set TX Power

[Neeraj Dhekale]

Hello,

I am using nRF52833 based BE33 (Celium Devices) and using nRF52SDK17.0.2. I am trying to change TX power of advertising but even though I have written the below statement.

init.advdata.p_tx_power_level = &BT_TX_POWER;

I need to call separately sd_ble_gap_tx_power_set() after advertising_init() function to make it set. Currently, I believe there is no mechanism to check at what TX power currently my BLE is transmitting. But I am checking the change in current consumption and by comparing the range of advertisement.

I am trying to change it from 0dBm to +8dBm Tx power but I can see I need to call sd_ble_gap_tx_power_set() above statement written in advertising_init() function is not enough. Why so?

Thanks and regards,

Neeraj Dhekale

[Jared]

Hi.

Setting init.advdata.p_tx_power_level doesn't actually configure the TX power, it only modifies the TX power field in the advertising packet. To actually configure the power setting you have to call sd_ble_gap_tx_power_set(), by default it will use 0 dBm. 

regards

Jared 

[Neeraj Dhekale]

Hello Jared,

Thanks for the information.

Noted.

Thanks and regards 

Neeraj Dhekale