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
I have solved my previous problem with UART service but now it is working, I am able to send data and receive it.
Now I am trying to merge NUS with multiperipheral example. I am able to connect two mobile devices to nRF chip at once, send data with RX Characteristics simultaneously from both smartphones (it then shows on TERMITE terminal). I am struggling with sending data from chip (TX Characteristics) to smartphones with ble_nus_data_send() function.
Originally in SDK the call looks like this:
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] == '\n') || (index >= (m_ble_nus_max_data_len)))
{
NRF_LOG_DEBUG("Ready to send data over BLE NUS");
NRF_LOG_HEXDUMP_DEBUG(data_array, index);
do
{
uint16_t length = (uint16_t)index;
err_code = ble_nus_data_send(&m_nus, data_array, &length, m_conn_handle);
if ( (err_code != NRF_ERROR_INVALID_STATE) && (err_code != NRF_ERROR_BUSY) &&
(err_code != NRF_ERROR_NOT_FOUND) )
{
APP_ERROR_CHECK(err_code);
}
} while (err_code == NRF_ERROR_BUSY);
index = 0;
}
break;
...
...
}
}
but it uses m_conn_handle which is declared as static!
static uint16_t m_conn_handle = BLE_CONN_HANDLE_INVALID;
Problem exists when I want to connect more than one device and send data to it - the connection handles may vary, for example =0, =1, =2 etc. In the ble_app_uart example there is only one connection handle used all the time.
What I tried to do:
void uart_event_handle(app_uart_evt_t * p_event)
{
ble_gap_evt_t* p_gap_evt = (ble_gap_evt_t*) p_event;
p_gap_evt->conn_handle;
static uint8_t data_array[BLE_NUS_MAX_DATA_LEN];
static uint8_t index = 0;
uint32_t err_code;
NRF_LOG_INFO("....handle: %d", p_gap_evt->conn_handle);
switch (p_event->evt_type)
{
case APP_UART_DATA_READY:
UNUSED_VARIABLE(app_uart_get(&data_array[index]));
index++;
if ((data_array[index - 1] == '\n') || (index >= (m_ble_nus_max_data_len)))
{
NRF_LOG_DEBUG("Ready to send data over BLE NUS");
NRF_LOG_HEXDUMP_DEBUG(data_array, index);
do
{
uint16_t length = (uint16_t)index;
err_code = ble_nus_data_send(&m_nus, data_array, &length, p_gap_evt->conn_handle);
if ( (err_code != NRF_ERROR_INVALID_STATE) && (err_code != NRF_ERROR_BUSY) &&
(err_code != NRF_ERROR_NOT_FOUND) )
{
APP_ERROR_CHECK(err_code);
}
} while (err_code == NRF_ERROR_BUSY);
index = 0;
}
break;
...
...
}
}
The app_uart_evt_t structure doesn't contain connection handle data so I tried to cast it the following way:
ble_gap_evt_t* p_gap_evt = (ble_gap_evt_t*) p_event;
but getting the correct value of connection handle is a matter of luck, mostly I get random values so I believe this is a wrong idea.
My question:
What would you suggest me to do in order to send data with UART from nRF chip to every connected device at once? Is it a good idea, is it safe to just iterate through all the connection handles and just:
err_code = ble_nus_data_send(&m_nus, data_array, &length, 0); APP_ERROR_CHECK(err_code); err_code = ble_nus_data_send(&m_nus, data_array, &length, 1); APP_ERROR_CHECK(err_code); err_code = ble_nus_data_send(&m_nus, data_array, &length, 2); APP_ERROR_CHECK(err_code); ...
And in order to send to only one chosen device should I use ble_nus_data_send() simply outside uart_event_handle()?
Any advices highly appreciated, thanks
