How to change transmitting power ?

RE: How to change transmitting power ?

Sigurd — Tue, 07 Mar 2017 12:43:48 GMT

If you take a look at the Tx power service at BLE SIG, you can see that by default only read is supported, this is also how it's implemented in the SDK. So in order to set the Tx-power from the app, you will have to set the write permission on the Tx-power characteristic, and implement the desired behavior in ble_tps.c. Set-up the characteristic to support write in the function tx_power_level_char_add(), add the case BLE_GATTS_EVT_WRITE in ble_tps_on_ble_evt(), where you call the function on_write(p_tps, p_ble_evt). Implement the desired behavior in your on_write() function(e.g. set the tx power with sd_ble_gap_tx_power_set()).

RE: How to change transmitting power ?

Newbie — Tue, 07 Mar 2017 07:04:57 GMT

Hello, I am still looking for answer. I can change the power by adding api in code but my question is how should I allow user to change power from app according to his requirement?

RE: How to change transmitting power ?

Roger Clark — Wed, 01 Mar 2017 06:44:08 GMT

Your BLE code needs to include the tps (service) which is provided as part of the SDK

Your phone app needs to be able to write to the service characteristic in the tps service

Your screenshots seem to merely show the RSSI (received signal strength) by you phone. I'm not sure if the nRF phone App has a UI for the Transmit Power service (TPS), you may need to write this yourself.

RE: How to change transmitting power ?

Newbie — Wed, 01 Mar 2017 06:30:33 GMT

Hello, I have changed the power with api int8_t tx_power_level = -30; advdata.p_tx_power_level = &tx_power_level;

Now I am trying to check the power at -30 dbm and 4 dbm. I am using nrf connect app and I am checking rssi level but I am surprised to see that there is not much change. I am attaching screen shots above in question. Any thoughts? Thanks

RE: How to change transmitting power ?

Newbie — Wed, 01 Mar 2017 04:35:16 GMT

Hello, Thanks for reply. I can now change the tx power but my application is that user should be able to change the tx power from app during run time. Is this possbile? How to implement? Thanks

RE: How to change transmitting power ?

Roger Clark — Mon, 27 Feb 2017 19:50:53 GMT

You will need to add the Tx power service to the gls example if you want to control the Tx power

RE: How to change transmitting power ?

Sigurd — Mon, 27 Feb 2017 15:42:56 GMT

You want to change the tx-power using a phone app?

RE: How to change transmitting power ?

Newbie — Mon, 27 Feb 2017 11:49:03 GMT

Thanks for reply but my requirement is to change the tx power from app. So any suggestions?

RE: How to change transmitting power ?

Roger Clark — Mon, 27 Feb 2017 06:46:58 GMT

Please see

devzone.nordicsemi.com/.../