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CCS/MSP432P401R: launchpad receive ping messages

Part Number: MSP432P401R

Tool/software: Code Composer Studio

hi,

     I find uart receive some ping messages when debuging the msp-exp432p401 launchpad with uartecho demo. The messages like below:

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

ping 6

ping 7

ping 0

ping 8

ping 9

ping 10

ping 11

ping 12

ping 13

ping 14

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

I do not send this messages on my computer. So where do these messages come from?  I use ccs7.

I need your help.

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