Modifying UART peripheral example to send data without using UART peripheral

Question

SDK: 15.1
IDE: Keil
Softdevice: S132 v6.0

Hello, I am using the ble_app_uart example as a starting point. My goal is to send 5 bytes every 5 seconds to another nRF52 Development kit acting as the Central. For the central, I used ble_app_uart_c example. I have established successful link between the peripheral and client to send 5 bytes of my data. To do this, I created an App Timer, that every 5 seconds calls ble_nus_data_send() in the handler and transmits the array of 5 bytes to the central. This is working properly and I am able to see the 5 bytes of data every 5 seconds at the central side using a terminal program.

The question is, on the peripheral side, I would like to disable the UART peripheral since I no longer need it since I am plugging in my own data into ble_nus_data_send(). When I try to disable the UART by commenting out uart_init() inside the main() function, the devices stop connecting

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uart_init();
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

uart_init();

What code needs to be modified in order to disable the UART without breaking the functionality I described above?

hmolesworth · Answer

Did you change the data handler? How does the nus handle incoming data over BLE? I run the uart service and only modify the data_handler and disable uart_init() and all works as expected; I don't have anything else different. 
 static void services_init(void)
{
 uint32_t err_code;
 ble_nus_init_t nus_init;
 nrf_ble_qwr_init_t qwr_init = {0};

 // Initialize Queued Write Module.
 qwr_init.error_handler = nrf_qwr_error_handler;

 err_code = nrf_ble_qwr_init(&m_qwr, &qwr_init);
 APP_ERROR_CHECK(err_code);

 // Initialize NUS.
 memset(&nus_init, 0, sizeof(nus_init));

 nus_init.data_handler = nus_data_handler; // <==

 err_code = ble_nus_init(&m_nus, &nus_init);
 APP_ERROR_CHECK(err_code);
}

Modifying UART peripheral example to send data without using UART peripheral

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