Reduce coverage range of nRF51822..

RE: Reduce coverage range of nRF51822..

KETAN_PATEL — Fri, 14 Apr 2017 06:51:44 GMT

i write sd_ble_gap_tx_power_set() function in gap_params_init(void) function . then it work.

RE: Reduce coverage range of nRF51822..

KETAN_PATEL — Fri, 14 Apr 2017 06:47:59 GMT

Hi Wojtek. that's work it right now. thanks for reply.

RE: Reduce coverage range of nRF51822..

Wojtek — Tue, 11 Apr 2017 09:02:12 GMT

What does "not working" mean? Does it return NRF_SUCCESS? Did you measure RSSI with and without that function? You jus have to call it after enabling softdevice...

RE: Reduce coverage range of nRF51822..

KETAN_PATEL — Tue, 11 Apr 2017 09:00:03 GMT

Thanks for reply @endnode and wojtek i am try sd_ble_gap_tx_power_set(0xD8) function in main.c. but it's not working.

RE: Reduce coverage range of nRF51822..

endnode — Mon, 10 Apr 2017 11:20:58 GMT

@shravani but your question has nothing to do with original topic. Can you submit separate question or point us to it (if already exists and is unanswered)?

RE: Reduce coverage range of nRF51822..

Wojtek — Mon, 10 Apr 2017 11:20:03 GMT

Like he said, nRF Connect. Or lightblue if you are on ios.

RE: Reduce coverage range of nRF51822..

shravani — Mon, 10 Apr 2017 11:19:15 GMT

hi, can you tell me in which smart app i can see manufacturer specific data without connecting. thank you

RE: Reduce coverage range of nRF51822..

endnode — Mon, 10 Apr 2017 11:12:41 GMT

Also it might very well be reality. If your "listener" has sensitivity close to any modern properly tuned RF chip then it obviously sees your device even it advertises at -40dBm because it has sensitivity down to -80/-90/-100dBm... Can you plot measured RSSI by some reference device (anything will do the job, e.g. mobile phone with nRF Connect app) and see that tuning Tx Power down has some effect?

RE: Reduce coverage range of nRF51822..

Wojtek — Mon, 10 Apr 2017 10:37:55 GMT

Probably it is set back to previous value somewhere else then, or your argument is invalid. It should work correctly. The argument should be int8_t type, like specified here.

RE: Reduce coverage range of nRF51822..

shravani — Mon, 10 Apr 2017 10:25:40 GMT

hi,i tried all allowed values in sd_ble_gap_tx_power_set but still getting same range

RE: Reduce coverage range of nRF51822..

endnode — Mon, 10 Apr 2017 10:07:02 GMT

You need to use one of allowed values (depending on chip, nRF51 should support +4, 0, -4, -8, -12, -16, -20 and -40) as sd_ble_gap_tx_power_set function parameter.