Send packet continuously over nus

RE: Send packet continuously over nus

Fiske — Tue, 09 May 2017 00:55:37 GMT

Can I modify the code to below? Can below code make sure that all packet are deliveried

  i=UserUart.RxBuf[1]+2;
       index = 0;
       while(i>0)
       {
         if(i>20)
         {
           while((err_code = ble_nus_string_send(&m_nus, UserUart.RxBuf+index, 20)) ==BLE_ERROR_NO_TX_PACKETS)
           {           
                      ;
           }
           if (err_code != NRF_ERROR_INVALID_STATE)
           {
               APP_ERROR_CHECK(err_code);
           }
           i -= 20;
           index += 20;
         }
         else 
         {
           while((err_code = ble_nus_string_send(&m_nus, UserUart.RxBuf+index, i))====BLE_ERROR_NO_TX_PACKETS) 
            {

                         ;
            }
           if (err_code != NRF_ERROR_INVALID_STATE)
           {
               APP_ERROR_CHECK(err_code);
           }
           i = 0;

         }

       }

RE: Send packet continuously over nus

Hung Bui — Mon, 08 May 2017 13:52:42 GMT

You are correct, Turbo. I mentioned about the return code TX buffer full that he need to handle. It's called now BLE_ERROR_NO_TX_PACKETS, was BLE_ERROR_NO_TX_BUFFERS before. And yes, he need to handle that return code and not send it to APP_ERROR_CHECK.

RE: Send packet continuously over nus

Turbo J — Mon, 08 May 2017 11:48:47 GMT

Contrary to Hung Bui's answer, your code will not work in case you go over 6 or 7 times 20 bytes.

The ble_nus_string_send() function will return an error code (BLE_ERROR_NO_TX_PACKETS), and your app goes to whatever app_error_handler() you have set up.

You need to handle at least this error indicating that the SD has no more TX buffers left.

RE: Send packet continuously over nus

Hung Bui — Mon, 08 May 2017 08:00:51 GMT

Hi Fiske,

Yes you can. You will receive TX buffer full return code when the buffer is full (7 packets with high bw) and this way keeps the CPU running all the time.