NUS UART sending data problem

[Pawel Niedbala]

Hi! 

My setup:

* nRF52 DK

* nRF5_SDK_15.0.0_a53641a

* s132_nrf52_6.0.0

* SES V3.34b 64-bit

* android ver.8 smartphone with nRF Connect / LightBlue / nRF UART v2.0

I am using uart_ble_app example and I am able to send data through "RX Characteristic" which then shows in terminal. But I can't get any reasonable data in "TX Characteristic". Infocenter says that I should enable notifications but then again I see  TX Characteristic value = "Notifications enabled". 

I have enabled: 

char_md.char_props.read = 1;

inside static uint32_t tx_char_add(ble_nus_t * p_nus, ble_nus_init_t const * p_nus_init), ble_nus.c

No success.

I have even tried to send predeclared data from chip to smartphone:

    uint8_t data_[3] = {17,18,19}; 
    uint16_t length_ = 3; 
    err_code = ble_nus_data_send(&m_nus, data_, &length_, m_conn_handle); 

inside void uart_event_handle(app_uart_evt_t * p_event), main.c.

 but no success at all.

I have tried sdk15 uart example as well as sdk13, but I can't send string data from nRF chip to android device. 

My question:

I can send data from smartphone to chip, but does NUS allow sending string data, hexes, int arrays from nRF chip to smartphone? Or am I doing something wrong that it's not happening?

Thanks

[Pawel Niedbala]

Update 1:

It looks like the tx buffer comes empty, despite I put some random numbers into RX Characteristic in the mobile app.

void uart_event_handle(app_uart_evt_t * p_event)
{
    switch (p_event->evt_type)
    {
        case APP_UART_TX_EMPTY:
            NRF_LOG_INFO("quite empty, isn't it?");
            break;
            
    }
}

it prints "quite empty, isn't it?" on the terminal :(

[Pawel Niedbala]

Update 2:

Bidirectional communication in ble_app_uart works as I believe it is supposed to, I can send and receive data using a terminal. I just had to use TERMITE, because puTTY and J-Link terminal weren't suitable.

So for now it is solved

[Anubhav]

Hi,

My setup is completely the same as yours. I tried to run the UART example then bidirectional communication is possible as because I could send and receive data through TERMITE.

I added the UART example to another example but in that case, I just can see the sent data from my phone to nRF52840 board but I can't see the data sent from my nRF52840 board to my phone.

Can you please help me with the problem???

[Pawel Niedbala]

Hi

I don't think like I'm able to help - lack of knowledge and other tasks to do. I suggest you to open a new thread with this problem so Nordic support team can assign you an engineer. This thread is already marked as "solved".