case about ncs v2.1.0 serial_lte_modem example

Hi 

sdk :  ncs v2.1.0

example   :  serial_lte_modem

I used the following command to test and found that sending the character "failed, how should I set it so that I can send the character"

AT#XMQTTPUB="test/smart","\123456\789123",0,0


OK


AT#XMQTTPUB="test/smart","\"123456\"789123",0,0


ERROR






Thank you for all your assistance.
Kind regards,
Peter.Min

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