i want to do simple data transfer and why blueetooth serial terminal was not be able to detect the device?

[venkatesha kj]

how to do simple data transfer using bluetooth serail terminal?

[Karl Ylvisaker]

Hello,

You could use the BLE NUS peripheral and central examples to do such a transfer between your devices.
The examples will relay anything they receive over UART to their connected peer over BLE, and the peer will output the messages received over BLE out on its UART, and visa versa.
Test this according to the example documentation, and let me know if you encounter any issues or questions.

Best regards,
Karl

[venkatesha kj]

i go through the nsu code but which api was used to transfer the data?

[venkatesha kj]

ble_nus_data_send is this function depends on the service?

[venkatesha kj]

which function was used to receive the data?

[venkatesha kj]

if i disable the uart and try to print on display it was not working?

[venkatesha kj]

static void nus_data_handler(ble_nus_evt_t * p_evt)
{

if (p_evt->type == BLE_NUS_EVT_RX_DATA)
{
uint32_t err_code;

NRF_LOG_DEBUG("Received data from BLE NUS. Writing data on UART.");
NRF_LOG_HEXDUMP_DEBUG(p_evt->params.rx_data.p_data, p_evt->params.rx_data.length);

for (uint32_t i = 0; i < p_evt->params.rx_data.length; i++)
{
Paint_DrawString_EN(105, 20, p_evt->params.rx_data.p_data[i]+'0', &Font12,BLACK,WHITE);
/*err_code = app_uart_put(p_evt->params.rx_data.p_data[i]);
if ((err_code != NRF_SUCCESS) && (err_code != NRF_ERROR_BUSY))
{
NRF_LOG_ERROR("Failed receiving NUS message. Error 0x%x. ", err_code);
APP_ERROR_CHECK(err_code);
}*/

}
/*
if (p_evt->params.rx_data.p_data[p_evt->params.rx_data.length - 1] == '\r')
{
// while (app_uart_put('\n') == NRF_ERROR_BUSY);
//while (Paint_DrawChar(105,20,'\n',BLACK,WHITE) == NRF_ERROR_BUSY);
}*/
}

instead of sending data to uart i try to display on oled display but not displayed on the oled

[Karl Ylvisaker]

Hello,

venkatesha kj said:

which function was used to receive the data?

The data is received from the SoftDevice in the BLE_NUS_EVT_RX_DATA event.

venkatesha kj said:

instead of sending data to uart i try to display on oled display but not displayed on the oled

venkatesha kj said:

if i disable the uart and try to print on display it was not working?

Please use the Insert -> Code option when sharing code here on DevZone.

This sounds like an application layer logical issue. 
Were you able to see the data on your serial terminal before you started modifying the example? Keep in mind that I do not know anything about your OLED display, or the driver you are using to operate it.
Have you verified that the OLED performs as expected with a test sequence of bytes? For example, does it perform as expected if you pass a couple of ASCII encoded bytes to your Paint_DrawString_EN function?

Best regards,
Karl