How to transmit continous data from FRDM-KW41ZMCU to ble device (NXP IOT toolbox is app)?

[pooja_vernekar]

Hello,

I am trying to transmit a "Hello\n" message from FRDM-KW41Z MCU to NXP IOT Toolbox (wireless uart).

But i am not able to receive any message.

I am using demo example - "BLE-wireless uart" ,

wireless uart example program is working fine but i want to transmit data from MCU to NXP IOT Toolbox(wireless uart ) application. Without typing any message into the terminal or Serial terminal i should be able to recieve message on NXP iot toolbox application.

This is what i have made changes to function.

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

static void BleApp_FlushUartStream(void *pParam)
{
char *pMsg = "hello\n";
uint16_t bytesRead = 0;

if (mPeerInformation.appState != mAppRunning_c)
{
return;
}

/* Allocate buffer for GATT Write */
*pMsg = MEM_BufferAlloc(mAppUartBufferSize);
if (*pMsg == NULL)
{
return;
}

/* Collect the data from the serial manager buffer */
if ( Serial_Read( gAppSerMgrIf, *pMsg, mAppUartBufferSize, &bytesRead) == gSerial_Success_c )
{
if (bytesRead != 0)
{
/* Send data over the air */
BleApp_SendUartStream(mPeerInformation.deviceId, *pMsg, bytesRead);
}
}
/* Free Buffer */
MEM_BufferFree(*pMsg);
}

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

please suggest if any changes to be made to any other functions of the program.

[mario_castaneda]

Hi Pooja,

As you can see, the Wireless Uart example is waiting for a UART message, the serial manager provides a new incoming buffer, also please look at the BleApp_SendUartStream that sends data over the air.

It will depend on your application if you want a software timer or create an event.

Regard,

Mario

[pooja_vernekar]

Hello Mario,

Is it not possible to receive a data from FRDMKW41Z board to ble wireless uart app?

I just need "hello" message from MCU board without typing/sending it via terminal.

[mario_castaneda]

Hi Pooja,

Is it not possible to receive data from the FRDMKW41Z board to ble wireless uart app?

Yes, it is possible. You need to create an event or timer, that triggers the BleApp_SendUartStream  with your message "Hello World".

Regards,

Mario