multi packets per connection interval

RE: multi packets per connection interval

Anders Strand — Thu, 07 Apr 2016 13:45:39 GMT

It really depends on how often you call data_send(). If you always have available TX buffers, then yes. If you want to see how many packets you send, you can use a ble sniffer like the nRF sniffer.. You can also use the nRF uart app for your smarthphone, and count the packets manually. This will only be possible if you set a very high connection interval though, like over 2 seconds.

RE: multi packets per connection interval

oliverhu — Thu, 07 Apr 2016 12:19:51 GMT

currently, i am using NRF51 dongle to receive data. it can receive up to 6 packets per interval,right. for example, if i want to achieve three data packets per interval, i just copy and past ble_nus_string_send three time,is it correct?

static void data_send()
{
uint32_t err_code;
static uint8_t data[BLE_LBS_DATA_CHAR_LEN] = {0};
        

    err_code = ble_nus_string_send(&m_nus, data, 20);
    if (err_code == BLE_ERROR_NO_TX_BUFFERS ||
        err_code == NRF_ERROR_INVALID_STATE || 
        err_code == BLE_ERROR_GATTS_SYS_ATTR_MISSING)
    {
        break;
    }
    err_code = ble_nus_string_send(&m_nus, data, 20);
    if (err_code == BLE_ERROR_NO_TX_BUFFERS ||
        err_code == NRF_ERROR_INVALID_STATE || 
        err_code == BLE_ERROR_GATTS_SYS_ATTR_MISSING)
    {
        break;
    }
    err_code = ble_nus_string_send(&m_nus, data, 20);
    if (err_code == BLE_ERROR_NO_TX_BUFFERS ||
        err_code == NRF_ERROR_INVALID_STATE || 
        err_code == BLE_ERROR_GATTS_SYS_ATTR_MISSING)
    {
        break;
    }

}

BTW, how can i view the number of packets per interval in MCP?

Thank You very much

RE: multi packets per connection interval

Anders Strand — Thu, 07 Apr 2016 12:05:06 GMT

Yes. But the amount of packets per interval is in many cases limited by your central device. See this post on BLE throughput.

RE: multi packets per connection interval

oliverhu — Thu, 07 Apr 2016 11:57:03 GMT

hi, anders strand, i still have a question that use ble_nus_string_send, is it possible to achieve multi packets per connection interval.

RE: multi packets per connection interval

Anders Strand — Thu, 07 Apr 2016 11:26:13 GMT

Great! Feel free to mark the question as answered by clicking the (V) sign next to my post

RE: multi packets per connection interval

oliverhu — Thu, 07 Apr 2016 09:17:11 GMT

thank you! Anders, It can receive data by using ble_nus_string_send. but if i use ble_nus_string_send, is it possible to achieve multi packets per connection interval.

RE: multi packets per connection interval

Anders Strand — Thu, 07 Apr 2016 09:12:28 GMT

Hello.

The ble_lbs_data_send function will send the data to the connection handle saved in m_lb->conn_handle. This handle is normally set in connection. If you have not changed the ble_app_uart example to do this, this handle is probably not valid. You should check the error code returned by ble_lbs_data_send. See how here.

If you want to implement this as easy as possible with the ble_app_uart example, replace ble_lbs_data_send with ble_nus_string_send inside data_send.

-Anders