throughput manage (BLE_ERROR_NO_TX_PACKETS)

Question

Hello, 
 First of all I know that many questions were posted here about this topic but I am posting mine because I couldn't figure out how to solve my issue and I am looking for new ideas. 
 I am working on a project of throughput data from sensors to my central via nRF51822 through a notifying service (SDK12.2, S130). 
 My central is an iOS app, and my throughput data are given from STM32 via UART but am sure I get them correctly. Also am using a simple buffer not fifo. 
 MIN_CONN_INTERVAL MSEC_TO_UNITS(20, UNIT_1_25_MS) 
 MAX_CONN_INTERVAL MSEC_TO_UNITS(40, UNIT_1_25_MS) 
 SLAVE_LATENCY 3 
 
 first of all I was adding packets to the TX buffer, faster than they can be sent out, and I got "BLE_ERROR_NO_TX_PACKETS " error.
so I tried to make sure that my TX task is complete before initiating next one with this implementation: 
 do{ 
 err_code = ble_data_send(&m_data_send, data_packet);
 nrf_delay_ms(2);
 }while(err_code== BLE_ERROR_NO_TX_PACKETS);
 
 But I still have the same problem. 
 What am I missing? 
 Is there any problem with my implementation? 
 Is there any example of maximum throughput manage? 
 Can this be a cause of my central ? 
 thank you in advance devzone community.
PS: if you want I can give more details.

BG · Accepted Answer

1/ I still dont understand your question: the numerical value of the throughput you are getting? 
 2/ I am sorry but I cant add the complete project so I will show more about the implementation 
 3/ ok 
 4/ Now the throughput is going well, what I did is that I created a new instance of FIFO to get and send data through my service so I guess I was asking my FIFO for too much work.
About the way to handle this, my implementation would be something like: 
 err_code = ble_data_send(&m_data_send, data_packet);
	if (err_code == BLE_ERROR_NO_TX_PACKETS) 
 {
 while(my_flag != true)
 {
 //do nothing
 }
 
 err_code = ble_data_send(&m_data_send, data_packet);
 my_flag = false;
 }
 
 and in the ble_evt_handle: 
 case BLE_EVT_TX_COMPLETE:
 my_flag = true ; 
 break;
 
 
 PS: ble_data_send() contains the sd_ble_gatts_hvx() macro.
is this a good way to use the BLE_EVT_TX_COMPLETE event before calling sd_ble_gatts_hvx() again? 
 5/ 6 * 20 B * 1/0.020 s = 3 kB/s = 48 kbps :this is the theoretical number
for me I just need 3 per conn-interval, so : 3 * 20 B * 1/0.020 s = 3 kB/s = 24 kbps

throughput manage (BLE_ERROR_NO_TX_PACKETS)

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