RE: How to set role for nrf_dm? One as reflector and the other as initiator

Jimmy0755 — Sat, 23 Mar 2024 04:19:08 GMT

Thanks for your support.

RE: How to set role for nrf_dm? One as reflector and the other as initiator

Edvin — Thu, 21 Mar 2024 09:00:24 GMT

Hello,

The reason you stop seeing distance measurements when you disable scanning on one of the devices is due to the nature of how this sample decides who to perform the distance measurement with.

When you have one device that is only advertising, that device will never get the advertising reports (callbacks when it has scanned an advertiement). This means that scan_filter_match() will never be called, which again means that peer_supported_add() is never called.

Then, later, when you advertise, and receive an adv_scanned_cb() callback, it uses "if (peer_supported_test())" to check whether the peer is in the list, but since no devices are added by peer_supported_add(), it will not set up a req. with DM_ROLE_REFLECTOR.

DM_ROLE_INITIATOR will not be used either, since that is triggered from the data_cb() in the scan_filter_match().

So, to make this work without scanning at all, you would need to comment out the line:

if (peer_supported_test(info->addr)) {

(and the opposing "}" a few lines below)

in adv_scanned_cb(). Then you should see measurements where the non-scanning device acts as the reflector.

There are other ways to initiate this as well. One possible way would be to enter a BLE connection through normal advertising from one device and scanning from the other, and agree upon this inside the connection.

Best regards,

Edvin