RE: Distance Measurement Mesh Client + Server Sample Wanted

adojang — Sat, 04 Jan 2025 12:19:50 GMT

After 4 days of struggling and a ton of assistance from Claude (Anthropic's AI chat bot) and nRF's own AI, I finally got it.

My approach involved using a shorter UUID (appropriate for my application), which gave space to transmit the data from other nrf_dm devices to the primary one.

I'm including the source files here for anyone else. This is the starting point for doing trilateration.

To use them, copy the nordic dm sample in visual studio (https://github.com/nrfconnect/sdk-nrf/tree/main/samples/bluetooth/nrf_dm)

Then just replace all the files with these ones.

I was able to get this working on 3 x nRF52840 dongles.

devzone.nordicsemi.com/.../nrfMultiDistance.zip

CmakeLists.txt:

#
# Copyright (c) 2021 Nordic Semiconductor
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
#
cmake_minimum_required(VERSION 3.20)

find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
project(nrf_dm)

# NORDIC SDK APP START
target_sources(app PRIVATE
  src/main.c
  src/pwm_led.c
  src/peer.c
  src/service.c
  src/claude.c
  )
# NORDIC SDK APP END

zephyr_library_include_directories(${CMAKE_CURRENT_SOURCE_DIR})

prj.conf:

#
# Copyright (c) 2021 Nordic Semiconductor ASA
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
#

# BT
CONFIG_BT=y

CONFIG_BT_CENTRAL=y
CONFIG_BT_PERIPHERAL=y

CONFIG_BT_SCAN=y
CONFIG_BT_SCAN_FILTER_ENABLE=y
CONFIG_BT_SCAN_NAME_CNT=1
CONFIG_BT_SCAN_MANUFACTURER_DATA_CNT=1
CONFIG_BT_SCAN_WITH_IDENTITY=y
CONFIG_BT_ID_MAX=1

CONFIG_BT_EXT_ADV=y

CONFIG_BT_DDFS=y

# Distance Measurement
CONFIG_DM_MODULE=y

CONFIG_MPSL=y
CONFIG_MPSL_TIMESLOT_SESSION_COUNT=1

CONFIG_DM_MODULE_LOG_LEVEL_DBG=n
CONFIG_DM_GPIO_DEBUG=y
CONFIG_PWM=y

CONFIG_NCS_SAMPLES_DEFAULTS=y
CONFIG_DK_LIBRARY=y

CONFIG_DM_HIGH_PRECISION_CALC=y

Hung Bui , once I finish with a solid implementation, would nordic be interested in the source code to publish it?

I feel this is something a lot of aspiring engineers think is something trivial, only to get stuck in the nitty gritty of ble. Would have helped me a lot.

RE: Distance Measurement Mesh Client + Server Sample Wanted

adojang — Fri, 03 Jan 2025 14:36:30 GMT

Hi Hung, I coped over the nrfm_dm sample and worked my way from there to my modified code.

I'd like to pursue the proper mesh implementation rather, as it was built for this exact case.

I'm not familiar with the mesh/client at all yet, despite reading through the documentation I mentioned above a few times.

What would be a good next step for me to get this thing going?

RE: Distance Measurement Mesh Client + Server Sample Wanted

Hung Bui — Thu, 02 Jan 2025 15:25:45 GMT

Hi Adriaan,

How did you implement the distance measurement toolbox ?

Did you implement this with the dm_client and the dm_srv model ? You need to use these model if you want to receive the distance between 2 server to the client.

Are you familiar with our mesh server/client ?