nrf51822 BLE disconnection problem

[DragonAnger]

Hi, I'm using nrf51822 and ble_app_uart(SDK 12.3.0)

What I want to do is connect my board with nrf51822 and send data over UART

and send data to smartphone over BLE

UART data comes about 50bytes/sec

My problem is BLE connection is keep disconnected.

Actually, Hard to connect BLE at first. Sometimes do, Sometimes don't.

When it connected fortunately, It will disconnected soon.

Disconnecting time is unpredictable.

Sometimes smartphone receive data, sometimes don't.

I didn't changed sample code.

I'm new BLE, please help me..

Thanks!

void uart_event_handle(app_uart_evt_t * p_event){
static uint8_t data_array[BLE_NUS_MAX_DATA_LEN];
static uint8_t index = 0;
uint32_t       err_code;

switch (p_event->evt_type)
{
    case APP_UART_DATA_READY:
        UNUSED_VARIABLE(app_uart_get(&data_array[index]));
        index++;
        if ((data_array[index - 1] == '\r') || (index >= (BLE_NUS_MAX_DATA_LEN)))
        {
            err_code = ble_nus_string_send(&m_nus, data_array, index);
					
            if (err_code != NRF_ERROR_INVALID_STATE)
            {
                APP_ERROR_CHECK(err_code);
            }

[Petter Myhre]

I think you are getting an error somewhere which resets the chip. After reset you are not connected anymore, and you have an invalid connection handle. See if you get an error anywhere, see this for more info.

[DragonAnger]

Thank you for your answer! I found out that BLE diconnected because of reset like you said. I'm trying to find what causes reset. But, It's little weird because I almost didn't change example code ble_app_uart in SDK12.