Adding observer role to peripheral example

RE: Adding observer role to peripheral example

Tanner — Thu, 26 Jul 2018 23:09:48 GMT

I found the obvious step that I was missing. Apparently, scanning for advertising packets will stop when the status of a received advertisement packet is not BLE_GAP_ADV_DATA_STATUS_INCOMPLETE_MORE_DATA. Scanning has to be restarted when these packets are received. From the S132 API Reference (v6.0.0):

* @note The scanner will automatically stop when ... a @ref BLE_GAP_EVT_ADV_REPORT event is received and @ref ble_gap_adv_report_type_t::status is not set to @ref BLE_GAP_ADV_DATA_STATUS_INCOMPLETE_MORE_DATA. In this case scanning is only paused to let the application access received data. The application must call this function to continue scanning, or call @ref sd_ble_gap_scan_stop to stop scanning.

So the fix for me was to call observe_start(), defined above, after every received advertising packet. Interestingly, the sd_ble_gap_scan_stop() portion of observe_start() was necessary to restart scanning. Trying to restart without calling out the stop function returned NRF_ERROR_INVALID_STATE.

As Martin mentioned, db_discovery and lbs_c were not necessary, since I wasn't trying to make a connection.

RE: Adding observer role to peripheral example

MartinBL — Wed, 25 Jul 2018 08:56:38 GMT

Hi,

Sorry for the slow response. It is holiday season in Norway and the response time is slower than usual.

I suggest that you have a look at the BLE Central & Peripheral examples. They show how you can e.g. act as a relay and connect to both a central and peripheral(s) at the same time.

The db_discovery_init() stuff should only be necessary of you plan on connecting to peripherals and use their services and characteristics.

If you are still struggling, do you mind uploading your entire project so I can have a look?

RE: Adding observer role to peripheral example

Tanner — Tue, 24 Jul 2018 18:53:39 GMT

I have not, but glad to know I'm not alone. I'll be sure to update this thread if I do find a solution. I also received an email from Nordic indicating that an engineer has been assigned to this ticket, so hopefully we'll get some input soon.

RE: Adding observer role to peripheral example

Jim — Tue, 24 Jul 2018 01:49:51 GMT

I wonder if you have solved this problem. If you did, I would like to know the answer.