Ble advertising 52840 random pauses

Question

Hi,

I'm trying to setup a simple BLE Advertising beacon the broadcasts once per 3 seconds, th problem Im having is it will do this for about 10 broadcasts then stop and rest for 7ish seconds before starting again?

any suggestion for what I'm doing wrong?

I am prototyping using bluefruit library that uses softdevice S140 7.3.0

below is my code.

void startAdv(void)

{

// Advertising packet

Bluefruit.setName("DROID");

Bluefruit.Advertising.addFlags(BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE);

Bluefruit.Advertising.addTxPower();

Bluefruit.Advertising.addName();

Bluefruit.Advertising.setType(BLE_GAP_ADV_TYPE_NONCONNECTABLE_NONSCANNABLE_UNDIRECTED); // for XIAO BLE

Bluefruit.Advertising.restartOnDisconnect(true);

Bluefruit.autoConnLed(false);

Bluefruit.Advertising.setInterval(500, 3000); // in unit of 0.625 ms

Bluefruit.Advertising.setFastTimeout(1); // number of seconds in fast mode

Bluefruit.Advertising.start(0); // 0 = Don't stop advertising after n seconds

}

void disconnectPin(uint32_t ulPin)

{

if (ulPin >= PINS_COUNT)

{

return;

}

ulPin = g_ADigitalPinMap[ulPin];

NRF_GPIO_Type *port = nrf_gpio_pin_port_decode(&ulPin);

port->PIN_CNF[ulPin] =

((uint32_t)GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos) | ((uint32_t)GPIO_PIN_CNF_INPUT_Disconnect << GPIO_PIN_CNF_INPUT_Pos) | ((uint32_t)GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) | ((uint32_t)GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos) | ((uint32_t)GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos);

}

void setup()

{

flash.begin();

Bluefruit.begin();

Bluefruit.setTxPower(+8); // Check bluefruit.h for supported values

flashTransport.begin();

if (flashTransport.runCommand(0xB9)== false)

{

pinMode(LED_BUILTIN, OUTPUT);

digitalWrite(LED_BUILTIN, LOW);

while (1)

{

yield();

}

flashTransport.end();

flash.end();

for (int i = 0; i < 25; i++)

{

disconnectPin(i);

}

sd_power_mode_set(NRF_POWER_MODE_LOWPWR);

sd_power_dcdc_mode_set(NRF_POWER_DCDC_ENABLE);

startAdv();

suspendLoop();

__WFE();

__WFI();

sd_app_evt_wait();

}