Questions about the distance measurement mesh model

Question

Hello 
 My application is based on the Distance measurement sample which uses a BLE scan response callback to trigger the measurement synchronization sequence in reflector mode and scan callback to trigger synchronization sequence in initiator mode. With the Distance mesh model the measurement sequence is started with the bt_mesh_dm_cli_measurement_start API 
 It seems that simply calling this API every time a scan packet arrives is going to overwhelm the mesh network. On the other hand it would be great to receive more than one measurement so averaging can be applied. What's your recommendation on how frequently should bt_mesh_dm_cli_measurement_start API be called? Also 
 There is an API bt_mesh_dm_cli_results_get() which returns the measurement results. 
 However the results are available in the bt_mesh_dm_cli_measurement_start() callback. Can you clarify when this function should be called? Do you plan to add a sample how the DM model should be used? That would very helpful 
 Thank you 
 Andy

AndyM · Accepted Answer

Update Got it to work, Can use mesh dm in the shell and measure distance between 2 nodes Here is what I had to do i 1. proj.conf CONFIG_BT_MESH_DM_CLI =y CONFIG_BT_MESH_DM_SRV =y 2. Add dm server and client to model composition struct bt_mesh_model _vnd_models [] = { // your vendor models // Distance measurement models. BT_MESH_MODEL_DM_CLI (& _dm_client ), BT_MESH_MODEL_DM_SRV (& _dm_srv ) }; // config client.used for provisioning via shell struct bt_mesh_cfg_cli _config_client ; static struct bt_mesh_model _root_models [] = { BT_MESH_MODEL_CFG_SRV , BT_MESH_MODEL_CFG_CLI (& _config_client ), }; static struct bt_mesh_elem _elements [] = { BT_MESH_ELEM ( 0 , _root_models , _vnd_models ), }; 3. I use mesh shell to provision. Added the following commands bind dm client model to node address mesh models cfg model app-bind 0 0x 000C 0x0059 bind dm server model to node address mesh models cfg model app-bind 0 0x000B 0x0059 NOTE 0x0059 is Nordic BLE ID. Must bind these models using Nordic ID not your company ID Otherwise bind fails Provisioned 2 nodes Now can do the following in the mesh shell mesh init mesh target dst mesh models dm start 1 (MPCD mode) Get this back Status: Success (err: 0) Entry number: 1 Mode: MCPD Quality: 0 Error Occurred: 0 Address: 0X0001 Best distance (cm): 60 IFFT distance (cm): 60 Phase slope distance (cm): 196 RSSI open space distance (cm): 891 NOTE The measurement takes about 2 seconds ( 1 minute 51-52 seconds) This is for 2 devices within BLE range Seems a bit long

Questions about the distance measurement mesh model

Top Replies