Hi! Im using a qectel bc66-NA chip and I have tried several times to follow the example in the datasheet (BC66&BC66-NA MQTT Application Note) to connect the devices to AWS, but it never worked. I couldn’t go beyond the command “AT+QMTOPEN=3,“a3pupxb4was62j-ats.iot.us-east-2.amazonaws.com”,8883” because the module’s response indicates that it failed.
We suspect that the issue may lie in the device’s acceptance of the certificates since the module’s response is ALWAYS “+QSSLCFG: 1,5,“cacert”,0”, even though we have tried with several certificates. Is there any possibility that the module only accepts certificates up to a certain number of characters?
Furthermore, I have already tried connecting to AWS using the MQTT fx tool application, and it worked correctly, eliminating the possibility of the issue being on the AWS side.