Timeslot extension

[Tong Yu]

Hello all,

After several tests about extending Timeslot, I have some questions.

1. I found out that the Timeslot will keep extending automatically after a successful extension, right?

2. If I am right about the first question, then about the extension length, in my code, extend.length_us = 200, and the "callback_action" will be set to "NRF_RADIO_SIGNAL_CALLBACK_ACTION_END" if the total length above 120,000,000 us, so that the Timeslot will end rather than exceed the 128s limit and extend failed.
   I used the "NRF_LOG_INFO" printed the result:
   :INFO:NRF_EVT_RADIO_SESSION_IDLE
   :INFO:NRF_EVT_RADIO_SESSION_CLOSED
   :INFO: extend_success_count = 600000
   :INFO: extend_fail_count = 0

    case NRF_RADIO_CALLBACK_SIGNAL_TYPE_EXTEND_SUCCEEDED: 
   
        if(total_timeslot_length >= 120000000)
        {
            signal_callback_return_param.callback_action = NRF_RADIO_SIGNAL_CALLBACK_ACTION_END;
        }else
        {
        total_timeslot_length += 200;
        extend_success_count++;
        }
   
        break;
   
    case NRF_RADIO_CALLBACK_SIGNAL_TYPE_EXTEND_FAILED: 
   
        fail_count++;
   
        break;
   

Also in Timeslot event handler:

    case NRF_EVT_RADIO_SESSION_IDLE:
        
        sd_radio_session_close();
        NRF_LOG_INFO("NRF_EVT_RADIO_SESSION_IDLE\r\n");

        break;

    case NRF_EVT_RADIO_SESSION_CLOSED: 
        
        NRF_LOG_INFO("NRF_EVT_RADIO_SESSION_CLOSED\r\n");
        NRF_LOG_INFO(" extend_success_count            = %d\r\n", extend_success_count);
        NRF_LOG_INFO(" extend_fail_count               = %d\r\n", fail_count);

        break;

But the problem is: the real time about the extension was far less that 120 seconds, only few seconds and as I increase the "extend_length", the real time get even shorter, so where is the problem?

Many thanks!

[Ole Bauck]

And fail_count is declared as volatile? You should put a breakpoint in the case and go into debug mode to check if you get the extend failed signal.

How many extends do you get?

Do you get the problem if you are not in a connection and not advertising or scanning (only initialized the SoftDevice)?