Changing Advertising periodically

RE: Changing Advertising periodically

ketil — Thu, 10 Mar 2016 14:13:23 GMT

Try starting your advertising with message B and see if that works. Might be something wrong with the way you initialize it.

RE: Changing Advertising periodically

SKo — Thu, 10 Mar 2016 13:27:14 GMT

This i only the array size. 16bytes was a comment for me, this is the space for my uuid.

RE: Changing Advertising periodically

Anders Strand — Thu, 10 Mar 2016 13:26:13 GMT

You are creating an array of length 15.
You write to index 4-22 of this 15 byte array on the for loop.
You put a 15 byte array into sd_ble_gap_adv_data_set, but the length parameter laenge is 18.

pt 2 and 3 could lead to hardfault, since you are reading and writing on non-allocated memory.

RE: Changing Advertising periodically

ketil — Thu, 10 Mar 2016 13:24:14 GMT

Your comment says 16 byte payload but your for loop adds 19?

for(i = 0; i <= 18; i++)                 //16 Byte Payload  
m_addl_adv_manuf_data[i+4] = 0xff;

Also braces are always recommended.

for(i = 0; i <= 18; i++)                 //16 Byte Payload  
{  
    m_addl_adv_manuf_data[i+4] = 0xff; 
}

RE: Changing Advertising periodically

SKo — Thu, 10 Mar 2016 13:24:11 GMT

This was my first idea. I got the Radio Notification working. But the advertising message isn´t changing. while advertising the funktion sd_ble_gap_adv_data_set(m_addl_adv_manuf_data, laenge, NULL, 0); isn´t able to chnage my advertising message.

RE: Changing Advertising periodically

ketil — Thu, 10 Mar 2016 13:12:12 GMT

Another possible solution, which does not rely on timers, is to use the Radio Notification Event Handler.

Start your message A as you normally would with a 100ms advertising interval. Every time the radio goes low you can increase a counter in the event handler. When the counter reaches 30 (100ms * 30 = 3000ms) you change the content of the advertisement packet to message B.

Radio Notification Tutorial

RE: Changing Advertising periodically

SKo — Thu, 10 Mar 2016 10:23:49 GMT

This is my timer init:

	app_timer_create(&advertising_100ms, APP_TIMER_MODE_REPEATED, advertising_100ms_handler);
	app_timer_start(advertising_100ms, MEASURE_INTERVAL_100, NULL);

	app_timer_create(&advertising_3000ms, APP_TIMER_MODE_REPEATED, advertising_3000ms_handler);
	app_timer_start(advertising_3000ms, MEASURE_INTERVAL_3000, NULL);

The first change of my advertising Data works. The first message is created in main.c before power_mange(); is started. The second message is the message generated every 100 ms. But the nthird message won´t come .

RE: Changing Advertising periodically

RK — Thu, 10 Mar 2016 10:13:44 GMT

What's the priority of your TIMER interrupts? If it's app high (ie 1) then it's higher priority than the SVC call which sd_* functions make and that's a hardfault.