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CCS/MSP432P401R: CC3100 stability problem?

Part Number: MSP432P401R
Other Parts Discussed in Thread: CC3100, CC3120

Tool/software: Code Composer Studio

Hi:

Board: MSP432P401R
Cc3100 WIFI SDK software version: CC3100 SDK V1.3
Ccs version: CCS8.0
Using the MSP432P401R board to establish client TCP socket communication through CC3100 WIFI, MSP432P401R always calls sl_Send(), the window program always accepts data and prints the data (window program test is stable).
It was found that the MSP432P401R board program always calls the sl_Send function. After 2 hours of testing, sl_Send returns an error value of -1.
Logging in to the router and discovering that CC3100 WIFI is always online, you can ping the MSP432P401R board IP.
Why does sl_Send return -1?
It stands to reason that the server-side program is not closed, and the sl_Send function does not return -1. help me?
while (1)
{
 retVal = sl_Send(SockID, "HelloWorld", strlen("HelloWorld"), 0);
 if (retVal < 0)
 {
  printf("retVal = %d\n", retVal);
  while (1);
 }
}
thanks

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