Tx power control in real time

[paul0208]

Hi,

I want to change the tx power of message after connected, not broadcast message

How can I do?

Can I get sample code?

BR

Paul

[natersoz]

Take a look at sd_ble_gap_tx_power_set() in the softdevice header file ble_gap.h

You should be able to change the power level upon connection from here.

[paul0208]

Hi,

sd_ble_gap_tx_power_set function's prototype is as follow:

sd_ble_gap_tx_power_set(uint8_t role, uint16_t handle, int8_t tx_power);

Can I call this function like this with null handler?

sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_ADV, 0, -30);

BR

Paul

[natersoz]

The doxygen comments in the header file are your guide: See ble_gap.h:

* @param[in] handle The handle parameter is interpreted depending on role:
* - If role is @ref BLE_GAP_TX_POWER_ROLE_CONN, this value is the specific connection handle.
* - If role is @ref 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
* @ref ble_gap_adv_properties_t::include_tx_power set.
* - For all other roles handle is ignored.

Also, see the constraints on power level: -30 dBm is not an option.

I have not yet used this option, so you're just going to have to experiment with it.

It is on my todo list, but higher priorities are keeping me from it.

[paul0208]

Hi, natersoz,

I used this function with null handler and got the success to control tx power.

Thank you for help.

BR

Paul

[natersoz]

Nice!