nRF51822 does not found service

RE: nRF51822 does not found service

hunasdf — Mon, 04 Dec 2017 13:01:11 GMT

Sorry, I forgot to explain the solution. I corrected this mistake :)

RE: nRF51822 does not found service

hunasdf — Mon, 04 Dec 2017 12:59:04 GMT

The solution was:

I deleted these rows from ble_nus_c.c, ble_nus_c_init function

err_code = sd_ble_uuid_vs_add(&nus_base_uuid, &p_ble_nus_c->uuid_type);
VERIFY_SUCCESS(err_code);

After that, the nRF51 discovered the services, but I do not know why the uuids were 0. So, I also modified the ble_nus_c_on_db_disc_evt fuction in ble_nus_c.c to the following:

void ble_nus_c_on_db_disc_evt(ble_nus_c_t * p_ble_nus_c, ble_db_discovery_evt_t * p_evt)
{
    ble_nus_c_evt_t nus_c_evt;
    memset(&nus_c_evt,0,sizeof(ble_nus_c_evt_t));

    ble_gatt_db_char_t * p_chars = p_evt->params.discovered_db.charateristics;

    // Check if the NUS was discovered.
    if (p_evt->evt_type == BLE_DB_DISCOVERY_COMPLETE)
    {
        uint32_t i;

        for (i = 0; i < p_evt->params.discovered_db.char_count; i++)
        {
						if (i == 0) {
								nus_c_evt.handles.nus_rx_handle = p_chars[i].characteristic.handle_value;
                nus_c_evt.handles.nus_rx_cccd_handle = p_chars[i].cccd_handle;
						
						} else if (i == 1) {
							nus_c_evt.handles.nus_tx_handle = p_chars[i].characteristic.handle_value;
						}
        }
        if (p_ble_nus_c->evt_handler != NULL) 
        {
            nus_c_evt.conn_handle = p_evt->conn_handle;
            nus_c_evt.evt_type    = BLE_NUS_C_EVT_DISCOVERY_COMPLETE;
            p_ble_nus_c->evt_handler(p_ble_nus_c, &nus_c_evt);
        }
    }
}

And finally can send with ble_nus_c_string_send function and I get callback on receive at ble_nus_c_evt_handler function in main.c file (BLE_NUS_C_EVT_NUS_RX_EVT event).

RE: nRF51822 does not found service

Petter Myhre — Mon, 04 Dec 2017 12:46:42 GMT

Please consider adding an answer to your question.

RE: nRF51822 does not found service

hunasdf — Fri, 01 Dec 2017 12:52:06 GMT

Thanks Man, you helped a lot! It is working now :)

RE: nRF51822 does not found service

endnode — Wed, 29 Nov 2017 20:02:00 GMT

Not really but to be fair I don't use the modules you use for discovery so I have no idea what these writes mean. Go into your code and either push out more debugging info or debug yourself. I actually never understood benefit of using modules which you don't know how they work internally so then you are completely lost when you need to debug them because they don't work as you expect. GATT Service discovery is pretty easy thing writable directly in SD GATT API calls and events' handling especially if you are looking for single Service and single Characteristic.

RE: nRF51822 does not found service

hunasdf — Wed, 29 Nov 2017 19:57:20 GMT

Ok, service discovered, characteristics discovered. But all characteristics with 0 UUID? Is it valid?

RE: nRF51822 does not found service

endnode — Wed, 29 Nov 2017 19:41:48 GMT

Regarding vendor specific UUID just search the forum for 128-bit UUID and you will get many answers explaining roughly the same... to your trace: it looks that service is discovered (at least now) so if you say "crash" you need to debug if it is really hard fault or just asserted error code returned from SD API (and then just print the error code and look to API documentation for explanation).

RE: nRF51822 does not found service

hunasdf — Wed, 29 Nov 2017 19:11:19 GMT

I am using ble_nus as GATT Server. Is it correct or I am thinking all wrong? :D So I do not found any other tutorial which can exchange data between devices. This is a reason why I am trying with this. but If it not a correct solution... And yeah, Simblee's documentation and everything is very poor, We hate it... -.-

RE: nRF51822 does not found service

hunasdf — Wed, 29 Nov 2017 19:02:02 GMT

Thanks for the comment, i answered the questions and added more details about the issue in Edit 01 section :)

RE: nRF51822 does not found service

Petter Myhre — Wed, 29 Nov 2017 10:02:52 GMT

What kind of firmware are you running on the Simblee? Have you registered the service you want to discover with ble_db_discovery_evt_register()?

RE: nRF51822 does not found service

endnode — Wed, 29 Nov 2017 08:53:11 GMT

Well the services can be found only if GATT Server exists and has particular Service object with correct UUID on it. The question is how you do it on Simblee.

The choice of "application" in BLE is matter of both peers. So while on nRF5x you have obvious choice of all read-made examples from nRF5 SDK + possibility to write almost anything (which is GATT Server/Client and GAP Central/Peripheral compliant) in custom FW it must match with the other side. What do you do with Simblee? (I guess it has nRF51 inside but it claims to lock you to some stupid Arduino style IDE and libraries and bootloader so no help from me, sorry;)