Measuring BLE Connection RSSI with NCS

RE: Measuring BLE Connection RSSI with NCS

_RK_ — Mon, 26 Apr 2021 15:44:02 GMT

Hi Carl,

I was able to build it by pulling latest from main branches of both /nrf and /nrflib and as well as updating the west to v0.10.1 from v0.9.x.

RE: Measuring BLE Connection RSSI with NCS

Carl Richard — Mon, 26 Apr 2021 05:59:59 GMT

Hi again, Franck!

As mentioned by _RK_ a fix is ready in the nRF Connect SDK master branch.

Best regards,
Carl Richard

RE: Measuring BLE Connection RSSI with NCS

Carl Richard — Mon, 26 Apr 2021 05:59:09 GMT

Hello!

Great. I stand corrected! Please open a new ticket regarding the build failure and we'll assist you there.

Best regards,
Carl Richard

RE: Measuring BLE Connection RSSI with NCS

_RK_ — Sat, 24 Apr 2021 10:32:15 GMT

Hi Carl,

sdk-nrfxlib/CHANGELOG.rst at master · nrfconnect/sdk-nrfxlib · GitHub As mentioned here, this issue probably has been already fixed and available on the master branch.

Fixed an issue where "HCI Read RSSI" would always return a Command Disallowed (0x0C) error code (DRGN-15310).

I tried to pull the master branch and build the hci_uart, but it's failing to build as follows, can you suggest any way to fix the includes for this build?

2> Compiling ‘entropy_ll_softdevice.c’
3> Compiling ‘entropy_cc310.c’
2> C:/Users/u1/ncs/v1.5.1/nrf/drivers/bt_ll_softdevice/entropy/entropy_ll_softdevice.c:12:10: fatal error: sdc.h: No such file or directory
2> compilation terminated.
3> C:/Users/u1/ncs/v1.5.1/nrf/drivers/entropy/entropy_cc310.c:20:10: fatal error: nrf_cc3xx_platform_entropy.h: No such file or directory
3> compilation terminated.
Build failed

RE: Measuring BLE Connection RSSI with NCS

Carl Richard — Wed, 21 Apr 2021 06:20:14 GMT

Hi!

As mentioned below the fix won't be available before the next major NCS release. In the meantime the Zephyr LL must be used for this functionality.

Best regards,
Carl Richard

RE: Measuring BLE Connection RSSI with NCS

_RK_ — Tue, 20 Apr 2021 18:20:31 GMT

Were you able to find a solution to this ?

RE: Measuring BLE Connection RSSI with NCS

Carl Richard — Tue, 09 Feb 2021 12:08:22 GMT

Great! I'll check with the developers.

Edit: I got back that it won't be ready before the next major NCS release at least.

Best regards,
Carl Richard

RE: Measuring BLE Connection RSSI with NCS

fgaultier — Mon, 08 Feb 2021 15:51:23 GMT

Thanks Carl. This is indeed what I did: starting from hci_power_ctrl sample.

Do you know whether that bug in the Softdevice controller will be fixed anytime soon ?

Best regards,

Franck

RE: Measuring BLE Connection RSSI with NCS

Carl Richard — Mon, 08 Feb 2021 15:44:56 GMT

Hi again!

There has been discovered a bug in our Softdevice controller that results in RSSI reading being disallowed. There are unfortunately no workarounds other than using the Zephyr LL. Apologies for the inconvenience.

Anyway, for proper handling of RSSI reading I suggest to check out how it's done in the hci_power_ctrl sample.

Best regards,
Carl Richard

RE: Measuring BLE Connection RSSI with NCS

fgaultier — Sun, 07 Feb 2021 16:23:17 GMT

Hi,

I was not able to have sdc_hci_cmd_sp_read_rssi(...) command return an RSSI value.

I tried also the Zephyr bluetooth sample hci_pwr_ctl:

Setting the TX power works fine (on NRF52833 and NRF52832 but with NRF52840 you have to adjust stack size),
But reading the RSSI (by sending first BT_HCI_OP_READ_RSSI hci command) does not work at all, unless you do not use soft device controller by setting the following config parameters
- CONFIG_BT_LL_SOFTDEVICE=n
- CONFIG_BT_LL_SW_SPLIT=y

Does someone have a working sample with sdc_hci_cmd_sp_read_rssi(...) ?

RE: Measuring BLE Connection RSSI with NCS

Carl Richard — Mon, 11 Jan 2021 10:27:59 GMT

Hi!

You should be able to read out the RSSI using the sdc_hci_cmd_sp_read_rssi(...) command. Ensure that the following is enabled in prj.conf of the project:

CONFIG_BT_CTLR_ADVANCED_FEATURES=y
CONFIG_BT_CTLR_CONN_RSSI=y

Hope this answers your question!

Best regards,
Carl Richard