RAK5010 publish MQTT messages ERROR

Hi everyone, I’m trying to send data from RAK5010 to cloud using MQTT. I was successful in connecting to cloudmqtt.com and getting data from there. But when I try to send data up there, I get error ERROR:RUI_AT_UNSUPPORT 1. Looks like I made a syntax error. I use termite 3.4 to send commands to RAK5010 and it doesn’t seem to understand the character I want to send. I also tried pressing “Ctrl+Z” as instructed in the documentation Quectel_BG96_MQTT_Application_Note_V1.0 but it doesn’t work, and when I press “enter” it shows the error as below and the rak5010 module hangs, no response. Here is the full AT command and the error I made:

at+set_config=cellular:(AT+QMTCFG=“aliauth”,0)
+QMTCFG: “aliauth”,"","",""
OK

at+set_config=cellular:(AT+QMTOPEN=0,“tailor.cloudmqtt.com”,12269)
OK
+QMTOPEN: 0,0

at+set_config=cellular:(AT+QMTCONN=0,“rak5010”,“khdcbvkq”,“EDKN68_xOv1Z”)
OK
+QMTCONN: 0,0,0

at+set_config=cellular:(AT+QMTSUB=0,1,“topic/pub”,0)
OK
+QMTSUB: 0,1,0,0

at+set_config=cellular:(AT+QMTPUB=0,0,0,0,“topic/pub”)

Hello Rak5010
Hello Rak5010
ERROR:RUI_AT_UNSUPPORT 1

I just like to clarify.

That is the reply on at+set_config=cellular:(AT+QMTPUB=0,0,0,0,“topic/pub”)?

Here is the image for the error I got

I also try with command at+set_config=cellular:(Hello Rak5010)
and at+set_config=cellular:(“Hello Rak5010”) as shown below but it causes rak5010 module to hang and become unresponsive