Hello everyone,
I’m currently working with an MC60 module and attempting to establish a connection with the ‘test.mosquitto.org’ MQTT server on port 8883 using CA authentication. However, I’m encountering an issue with the error message +QMTOPEN: 0,-1. I’ve followed the steps outlined in this guide: Quectel-AT-Examples.
And here my log file
AT+QMTCFG="SSL",0,1,2
OK
AT+QSECWRITE="RAM:cacert.pem",1452,100
CONNECT
+QSECWRITE: 1452,7710
OK
AT+QSECREAD="RAM:cacert.pem"
+QSECREAD: 1,7710
OK
AT+QSSLCFG="cacert",2,"RAM:cacert.pem"
OK
AT+QSSLCFG="seclevel",2,2
OK
AT+QSSLCFG="sslversion",2,4
OK
AT+QSSLCFG="ciphersuite",2,"0xFFFF"
OK
AT+QSSLCFG="ignorertctime",1
OK
AT+CPIN?
+CPIN: READY
OK
AT+CREG?
+CREG: 0,1
OK
AT+CGREG?
+CGREG: 0,1
OK
AT+QIMODE=0
OK
AT+QICSGP=1,"INTERNET"
OK
AT+QIREGAPP
OK
AT+QICSGP?
+QICSGP: 1
OK
AT+QIACT
OK
AT+QILOCIP
10.38.184.159
AT+QMTOPEN=0,"test.mosquitto.org","8883"
OK
+QMTOPEN: 0,-1
Additionally, I’ve observed that when attempting to connect without using SSL on port 1883, I can successfully establish a connection.
I would greatly appreciate any insights or guidance on resolving the ‘+QMTOPEN: 0,-1’ error and successfully establishing a connection with the MQTT server.