NRF52 ble_db_discovery failed to initialize correctly when repeats the service discovery

RE: NRF52 ble_db_discovery failed to initialize correctly when repeats the service discovery

Vincent — Tue, 21 Mar 2017 04:11:32 GMT

I got it. Next time I will create a new case. And about the Polar HR and Wahoo Speed Device problem I found the reason. If I read those two device service UUID(HR or CSC) and Appearance the adv_report_parse will return not NRF_SUCCESS. Now I realize that is not every BLE device are follow Standard BLE device does. I modify my project fw code to scan device only read the device name and mac address. Sorry about the scan Polar device problem I did not check each adv_report_parse function return vaule very carefully.

Thanks

RE: NRF52 ble_db_discovery failed to initialize correctly when repeats the service discovery

Hung Bui — Mon, 20 Mar 2017 15:24:27 GMT

@Vincent: Yes you are right, if we may connect to multiple server we need to handle like that.

Next time please create new case if you have a new question. Have you tried to use nRFConnect /Master Control panel on PC to scan for the Polar ?

RE: NRF52 ble_db_discovery failed to initialize correctly when repeats the service discovery

Vincent — Sat, 18 Mar 2017 02:42:41 GMT

Hi Hung Bui, My project is follow:

memset(&m_ble_db_discovery,0,sizeof(m_ble_db_discovery));

before ble_db_discovery_start()

But I saw the sdk 13 this part is:

memset(&m_ble_db_discovery[p_gap_evt->conn_handle], 0x00, sizeof(ble_db_discovery_t));
err_code = ble_db_discovery_start(&m_ble_db_discovery[p_gap_evt->conn_handle], p_gap_evt->conn_handle);

There is modify for one device so should I follow sdk 13 example does. and There is one more question is BLE central scan device problem Where is Document for BLE scan because I test SDK10~12.2 but non of one could scan the Polar Heart Rate belt Device but other HR device and any BLE device is fine. In the same time the Cell phone nRF ToolBox can scan Polar HR belt.

Thanks

RE: NRF52 ble_db_discovery failed to initialize correctly when repeats the service discovery

Vincent — Fri, 03 Mar 2017 14:12:51 GMT

OK, I will keep test my project. Thanks

RE: NRF52 ble_db_discovery failed to initialize correctly when repeats the service discovery

Hung Bui — Fri, 03 Mar 2017 14:09:45 GMT

Hi Vincent,

I think just zero-initialized p_db_discovery before calling ble_db_discovery_start() should works. I will update my answer.

RE: NRF52 ble_db_discovery failed to initialize correctly when repeats the service discovery

Vincent — Fri, 03 Mar 2017 12:55:23 GMT

Could you be more specific about "In ble_db_discovery.c move p_db_discovery->curr_char_ind = 0; from line 237 to line 234."

Because I am use SDK12.2 and I just add memset(&m_ble_db_discovery,0,sizeof(m_ble_db_discovery)); before ble_db_discovery_start() Now I can connect to my target device and disconnect and reconnect but before I can not.

Thanks

RE: NRF52 ble_db_discovery failed to initialize correctly when repeats the service discovery

Susheel Nuguru — Thu, 15 Sep 2016 08:26:05 GMT

Text from @hungbui from internal ticket explaining why this happens

ble_db_discovery failed to initialize correctly. In on_srv_disc_completion() we don't set p_db_discovery->curr_char_ind = 0; if there is no further service to be discovered. This results in the bug that if there is a reconnection and the client try to do service discovery again, the curr_char_ind will not be = 0. As it will start with the last one from previous service discovery of the previous connection. Suggest to always reinitialize curr_char_ind when we discover a service.

adding this thread to
SDK11 known issues
SDK12 known issues

RE: NRF52 ble_db_discovery failed to initialize correctly when repeats the service discovery

Hung Bui — Tue, 06 Sep 2016 13:26:07 GMT

Case was solved with fix required :

Re-initialize m_ble_db_discovery database in main.c whenever we call ble_db_discovery_start(). Suggest to add memset(&m_ble_db_discovery,0,sizeof(m_ble_db_discovery)); before ble_db_discovery_start()

According to ble_db_discovery_start() documentation the database shall be zero initialized before use:

 @warning p_db_discovery structure must be zero-initialized.

RE: NRF52 ble_db_discovery failed to initialize correctly when repeats the service discovery

Unnar — Mon, 29 Aug 2016 14:33:17 GMT

We created a case using MyPage, id is 31245 where we shared the code

RE: NRF52 ble_db_discovery failed to initialize correctly when repeats the service discovery

Petter Myhre — Mon, 29 Aug 2016 10:14:07 GMT

Could you try to catch this on a sniffer trace? You can use the nRF Sniffer. Do you ever "unsubscribe" in your code? When you reconnect, are you sure sd_ble_gattc_write() is called, and returns NRF_SUCCESS? Would it be possible to share somre more code? Maybe even the complete project? You can do it privately through your MyPage at nordicsemi.com