Quick connection parameters update

[Ziran]

Hello everyone,

I'm currently trying to change the connection parameters to be quick(100ms 0 slave latency) on a button press and after a timer timeout I go back to the low connection parameters.

I'm also sending a notification to an android application at the same time and then send back 2 characteristic ( LED toggle and a string for a LCD) .

It's working but it take quite a long time (10s) for my application to change the connection parameters so the 2 characteristic are not sent at quick connection parameters the first time but if I press a second time it's then updated and send it quickly.

Do you guys know a workaround this problem ?

[Ziran]

This is my timer handler

   static void cp_timeout_handler(void * p_context) {
	UNUSED_PARAMETER(p_context);

		gap_params_low();}

Those are the funstion that send the new parameters

static void gap_params_high(void) {
	ble_gap_conn_params_t gap_conn_params_high;
    gp=false;
	memset(&gap_conn_params_high, 0, sizeof(gap_conn_params_high));

	gap_conn_params_high.min_conn_interval = MIN_CONN_ITVL_UPDATE;
	gap_conn_params_high.max_conn_interval = MAX_CONN_ITVL_UPDATE;
	gap_conn_params_high.slave_latency = SLAVE_LATENCY_UPDATE;
	gap_conn_params_high.conn_sup_timeout = CONN_SUP_TIMEOUT_UPDATE;

	ble_conn_params_change_conn_params(&gap_conn_params_high);
			


}
static void gap_params_low(void) {
	ble_gap_conn_params_t gap_conn_params_low;

	gp=true;
	memset(&gap_conn_params_low, 0, sizeof(gap_conn_params_low));

		gap_conn_params_low.min_conn_interval = MIN_CONN_INTERVAL;
		gap_conn_params_low.slave_latency = SLAVE_LATENCY;
		gap_conn_params_low.conn_sup_timeout = CONN_SUP_TIMEOUT;
	ble_conn_params_change_conn_params(&gap_conn_params_low);

			


}

This is my case in on_ble_evt

case BLE_GAP_EVT_CONN_PARAM_UPDATE:
		
		app_timer_start(m_cp_timer_id, CP_INTERVAL,
						NULL);

			break;

This is my button handler

static void button_event_handler(uint8_t pin_no, uint8_t button_action) {
	
     app_timer_stop(m_powermanage_timer_id);
         if (gp){
		gap_params_high();
	          }



	/*Joue le son du Buzzer*/
	set_frequency_and_duty_cycle((uint32_t) (1075), 50);
	nrf_delay_ms(300);
	nrf_pwm_set_enabled(0);

	switch (pin_no) {
	case BOUTON_SONNETTE_PIN_NO:


                ble_lbs_on_button_change(&m_lbs,button_action);

		nrf_gpio_pin_write(LED_LCD_PIN, 1);

		gotoXY(12,2);
		LCDString("Bienvenue",1);

		break;


	default:

		break;
	}

app_timer_start(m_powermanage_timer_id, POWER_MANAGE_INTERVAL,
				NULL);
gp=false;
pm=false;}

gp is a static bool that I use because the event handler is called 2 times ( on push and release)

pm is also a static bool that I use to not go into power manage as long as the smartphone send write(in the handler of some characteristics)

[Knut Eldhuset]

ble_conn_params_change_conn_params(...) has a return code that you need to check. It is good practice to check the return code for all functions that have one. You will not be able to change the connection parameters if the previous procedure is not finished, or if the parameters are inconsistent.

[Ziran]

Can you tell me how to check the return code please ? Is it the err_code=function(); APP_ERROR_CHECK(err_code);

[Ziran]

Apparently, on Android 4.4.2 we can change the connection parameters only once . And that's why it does not want to go back to low or high after one update unless I disconnect and reconnect