LTE Link Monitor slm data mode times out

Hello, 

I'm using the LTE Link Monitor v2.0.1 with the nrf9160dk_serial_lte_modem_2022-06-02_880c82db application on a nRF9160.

I'm able to establish the connexion and send data, for example :

AT+CFUN=1

AT+CFUN?

AT#XSOCKET=1,2,0

AT#XSENDTO="52.215.34.155",7,"TEST"

AT#XRECVFROM=5

works as I'm receiving TEST back.

Unfortunately, I'm not able to enter slm data mode as it times out everytime. For example, I wanted to run the second example of TCP which uses slm data mode but when doing AT#XSEND, I receive Error: 'AT#XSEND ' timed out. 

Is there a reason for this behavior ? 

Best regards

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