LAUNCHCC3235MOD: LAUNCHCC3235MOD transceiver mode

the transceiver socket is bi-directional and enables sending and/or receiving.

What do you mean simultaneously? How exactly did you tried to use the socket and what is the failure?

I have to say that I'm not good at multi-threading, an old fashioned bare metal engineer.
What I want to do is:
- the module is idling waiting for either RF packet or uart data string,
- when a data string from the uart comes, then I want to transmit it after parsing it.
- when an RF packet comes, I want to process it and return
The example codes (network_terminal_CC3235S_LAUNCHXL_tirtos_ccs) that I got from SDK
is using multi-threading which are confusing to me.
For example, when I call sl_Recv(), it won't return until it gets a packet. (It seems to be blocked)
But I want it to return if there is no received data so that I can check UART data. How can I do that?
By the same token, when I call a uart reading function like UART_radPolling(), I want it to
return if there is no data, but it hangs there until it gets a byte.

My codes has the following structure:

under mainThread()

//after initialization of resources like SPI, UART, WiFI, etc,

while(1)
{
   lRetVal = GetCmd((char *)&strBuffer[0], 100); => it hangs there until it gets a line of data
   if(lRetVal == 0)
   {// no uart data
    // I call sl_Socket(), sl_SetSockOpt(), sl_Redv() and sl_Close() => It doesn't come here when there is no uart data

   }
   else
   {// uart data received
       // after parsing, I call sl_Socket(), sl_SetSockOpt(), sl_Send() and sl_Close() ==> This works well
   }
   return(0);
}

Is there any sample codes for me to solve this issue?