How to write uint32_t to characteristic?

[Tom]

I will write time to my ble device and need write uint32_t via characteristic. When i try only (uint8_t)data[0] is correct.

How can I do writable characteristics (uint32_t)? Example please.

[Tom]

Stefan it is other problem.

I try create writable characteristic with 4 byte data len.

My on_write ble event handler is:

static void on_write(ble_dls_t * p_dls, ble_evt_t * p_ble_evt)
{
    ble_gatts_evt_write_t * p_evt_write = &p_ble_evt->evt.gatts_evt.params.write;
		uint32_t temp_val = 0;
    
    if ((p_evt_write->handle == p_dls->dl_char_handles.value_handle) &&
        (p_evt_write->len == 4) &&
        (p_dls->dl_write_handler != NULL))
    {
				p_dls->dl_write_handler(p_dls, p_evt_write);
    }
		
}

and dl_write_handler is function:

static void dl_timestamp_write_handler(ble_dls_t * p_dls, ble_gatts_evt_write_t * p_evt_write)
{

	volatile uint8_t value1 = ((p_evt_write->data[0]));
	volatile uint8_t value2 = ((p_evt_write->data[1]));
	volatile uint8_t value3 = ((p_evt_write->data[2]));
	volatile uint8_t value4 = ((p_evt_write->data[3]));

}

in debuger when I write in Master Control Panel value 0x12345678:

value1 = 0x78
value2 = 0x78
value3 = 0x78
value4 = 0x78

how can I resolv problem?