Issue with MQTT open for MC60

i’m using mc60 as modem and sending AT commands from my main Application. Embedded sim is connected to modem which is registered in roaming mode. when iam trying to connect to mqtt iam getting +QMTOPEN: 0,3 error always. if i did the same operation on development board with local it is connecting to the Mqtt server successfully. any solution?

any help is appreciated.


Dear Sir,
Thanks for your inquiry in Quectel forum.
About your issue, it is better to check whether the SIM card, the registered network, the AT command sequence, the CSQ etc, are all the same. It is better to check where is the different. Then confirm where is the problem. Thanks!