https://devzone.nordicsemi.com/f/nordic-q-a/41247/how-to-limit-ble-5-range-in-nrf52840-to-5m-in-ble_app_uartHi, Board: nRF52840 PCA10056 Development kit Keiluvision 5 SoftDevice : S140 nRF-SDK 15.2 SDK example code: ble_app_uart Hi, I want to change the BLE range to 5 meters, so I tried this function as belows: uint32_t err_code = sd_ble_gap_tx_power_seten-USTelligent Community 13Fri, 14 Dec 2018 14:22:18 GMThttps://devzone.nordicsemi.com/thread/161887?ContentTypeID=1Fri, 14 Dec 2018 14:22:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f5237124-ab89-4b76-a205-ae947db1dca0run_ar<p>Do you have a sniffer log? this will show if there are any scan or connection request and also the rssi value of the packets at the sniffer.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/161590?ContentTypeID=1Thu, 13 Dec 2018 07:28:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2d599b46-88d9-469a-816d-e2c0b502d74bDevanshi1510<p>Yes, you got it correct at -40dB, setting I can connect at 2 ft and disconnection at 10 feet but cant reconnect at longer distance than 2 ft. No, there are no active scanners in the area. Central is not able to receive advertisement packets from peripheral.&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/161132?ContentTypeID=1Tue, 11 Dec 2018 08:43:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d967ce1e-c4b0-49c2-bfde-299ef1e80551run_ar<p>Are you saying that with the -40dBm setting you can connect at 2 ft, and you are disconnected at 10 feet? But you cannot reconnect at a longer distance than 2 feet?</p> <p>Can you confirm if there are any other scanners in the area, especially active scanners? You should also check with a sniffer to see if the central is able to receive the advertisement packet and actually sends a connection request. Also note that the connection request is a one off, i.e. if you have an error in this packet the connection will never be established (by the peripheral, while the central will send 6 packets to try to establish the connection). but when you are in a connection you can loose several packets without loosing the link, the number of packets depending on your connection parameters.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/160712?ContentTypeID=1Fri, 07 Dec 2018 11:19:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7bc7df68-6efa-432c-ada0-fff55f14aab4awneil<p>As frequently noted on this forum, the relationship between RSSI and distance is <em><strong>not at all</strong></em> precise in practice - especially when dealing with 3rd-party products like phones over which you have no control at all.</p> <p>Also remember that antennas are often directional...</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/160698?ContentTypeID=1Fri, 07 Dec 2018 10:06:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c02d7dcf-f74f-41e7-8639-64f9c09d0721run_ar<p>I guess you could try to measure the RSSI you are getting at -40 dBm. I assume you are aware that the range will vary depending on the environment in the location you are in.&nbsp; At what distance can you connect at -40dBm?</p><div style="clear:both;"></div>