The way now current tx power value check

RE: The way now current tx power value check

eggmoneyna — Thu, 29 Sep 2022 01:27:39 GMT

Thank you so much. Your reply was very helpful to me!😄

RE: The way now current tx power value check

Hung Bui — Wed, 28 Sep 2022 09:07:46 GMT

Hi JSY,
I'm sorry about the suggestion on sd_ble_gap_tx_power_get(). I was doing a quick search on google and found some hits on the function and thought that there's actually such function. I should have double checked.
But you are right, the application need to keep track of the txpower as there isn't an API to get the current tx_power from the stack.

Regarding your question about RSSI column, you just need to right click on the RSSI and click Apply as Column.

RE: The way now current tx power value check

eggmoneyna — Wed, 28 Sep 2022 07:22:31 GMT

Thank you for your answer, but the function sd_ble_gap_tx_power_get() does not exist.
I don't think there's a way to get TX POWER directly yet.

As you said, I installed a sniffer and tracked the advertiser.
After CONNECT_IND, I was able to check the information of master source and slave source. I think there will be a difference in RSSI if we set the TX POWER of Master and Slave differently and test it! I'll try it out. Thank you for giving me a good solution.

And this is an additional question. Can you tell me the version of your sniffer?
It is inconvenient to check at once because the RSSI and channel do not appear on the console of the sniffer I installed. I would appreciate it if you could answer this question.

RE: The way now current tx power value check

Hung Bui — Tue, 27 Sep 2022 09:01:27 GMT

Hi JSY,

p_gap_evt->params.adv_report.tx_power and .rssi only give you the tx_power included in the advertising packet and the rssi level when you receive the advertising packet not when in connection. You can see that if you advertise with higher output power, you will have larger rssi (but in negative value).

On the local device you can call sd_ble_gap_tx_power_get() to get the current TX_power.

If you want to verify the txpower to see that if you in fact have higher output power when in connection, you can use a sniffer to scan and follow the connection. The sniffer would be able to show the different in RSSI when in connection with different txpower that you set in the application.