how to enable bidirectional comunication on my nrf51822

RE: how to enable bidirectional comunication on my nrf51822

Michael Mangeng — Mon, 06 Nov 2017 17:05:31 GMT

unfortunately, the example referencd in the link is not available anymore: github.com/.../examples

but as Michal Andrzejewski pointed out, you do not need to use this type anymore.

RE: how to enable bidirectional comunication on my nrf51822

sjc — Mon, 06 Nov 2017 15:01:25 GMT

Dear Michael Mangeng, the githu link seems to be broken. Could you update it?

RE: how to enable bidirectional comunication on my nrf51822

Michal Andrzejewski — Thu, 23 Jun 2016 08:25:39 GMT

That's work :). In newest SDK 11 it is unnecessary to define variable of ble_gatts_evt_write_t type because sd_ble_gatts_value_get function does everything for us, like in this example:

    static void on_ble_write(ble_os_t * p_our_service, ble_evt_t * p_ble_evt) 
    {
            uint32_t data_buffer;
            ble_gatts_value_t rx_data;
            rx_data.len = sizeof(int16_t);
            rx_data.offset = 0;
            rx_data.p_value = (uint8_t*)&data_buffer;
            
            if(p_ble_evt->evt.gatts_evt.params.write.handle ==  p_our_service->RH_char_handles.value_handle)
            {
                sd_ble_gatts_value_get(p_our_service->conn_handle, p_ble_evt->evt.gatts_evt.params.write.handle, &rx_data);
        	    received_variable=*rx_data.p_value;
            }
     }

RE: how to enable bidirectional comunication on my nrf51822

Michal Andrzejewski — Tue, 21 Jun 2016 19:36:57 GMT

Thank's a lot!!! I'll let you know tommorow if it works properly.

RE: how to enable bidirectional comunication on my nrf51822

Michael Mangeng — Tue, 21 Jun 2016 15:13:39 GMT

you will receive a BLE_GATTS_EVT_WRITE event from which you can read the written data. see: github.com/.../main.c

RE: how to enable bidirectional comunication on my nrf51822

Michal Andrzejewski — Tue, 21 Jun 2016 10:19:24 GMT

I'm interested in the first option that you mentioned :). Do you know how can I read the information written by central (smartphone) on peripheral (nrf51)? Could you provide some example how should I receive that command on nrf51?

RE: how to enable bidirectional comunication on my nrf51822

Michael Mangeng — Tue, 21 Jun 2016 09:58:33 GMT

Hmm i'm not sure i understand you fully. During a connection the central can write data to peripheral anytime using write command/request. The peripheral can write data to the central if the central registered itself for HandleValue Notifications/indications.

If you want to Disconnect - and after some time - create a connection from the former peripheral to the smartphone... then you need to do what i sad in my response. Act as both central & peripheral at the same time.

RE: how to enable bidirectional comunication on my nrf51822

Michal Andrzejewski — Tue, 21 Jun 2016 09:46:52 GMT

Every connection event consists of data package sending from central to peripheral and other package sending after T_IFS period from peripheral to central. The peripheral doesn't hold a monologue so it is definitely possible to receiving some data from central, and GATT roles (Server and Client) are not fixed to GAP roles (Central and Peripheral). I just don't know how to make use of this knowledge in practice

RE: how to enable bidirectional comunication on my nrf51822

Michal Andrzejewski — Tue, 21 Jun 2016 09:36:08 GMT

That isn't exactly what I want to do. In my application, nrf51 should be peripheral all the time, and smartphone should be central, because smartphone oughts to start the connection. But during the connection I want to enable ability of reading data sending from smartphone by my nrf51. Talking more conventionally, I don't want to change GAP roles in my application, I want to nrf51 can smoothly swap its GATT role from Server to Client and vice-versa or rather simply play both roles simultaneously.

RE: how to enable bidirectional comunication on my nrf51822

Michael Mangeng — Tue, 21 Jun 2016 08:53:14 GMT

Hi!

we also use S130 to act as peripheral and central at the same time.

You have to start scanning as well as setup advertising. Stack will automatically listen for connects 8=>on_connected event) and you can perform your own connects when you receive an advertising event.

When you receive a CONNECTED event, you can check your role - e.g.:

if(p_ble_evt->evt.gap_evt.params.connected.role == BLE_GAP_ROLE_PERIPH) {
// we are peripheral
} else {
// we are central
}

greetings, Michael