We’re having some difficulties getting connected to AWS IoT Core via MQTT on an EC21-E module. The module is running firmware EC21EFAR06A01M4G.
We’re running into an error during the initial socket open (
AT+QMTOPEN) which is giving the
+QMTOPEN: 0,-1 URC.
On an EG21-G module with firmware EG21GGBR07A09M1G, the exact same AT command script proceeds without issue, we can connect and communicate just fine.
1. Are there any differences between the EC21-E and EG21-G that we need to know about for MQTT with TLS (specifically with AWS IoT Core)?
2. Is there a newer firmware for the EC21 modules that might fix this?
Thanks in advance!