Tx power control in real time

RE: Tx power control in real time

natersoz — Tue, 15 Jan 2019 03:18:02 GMT

Nice!

RE: Tx power control in real time

paul0208 — Tue, 15 Jan 2019 00:11:10 GMT

Hi, natersoz,

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

Thank you for help.

Paul

RE: Tx power control in real time

natersoz — Mon, 14 Jan 2019 15:10:37 GMT

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.

RE: Tx power control in real time

paul0208 — Mon, 14 Jan 2019 11:07:06 GMT

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);

Paul

RE: Tx power control in real time

natersoz — Mon, 14 Jan 2019 05:09:46 GMT

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.