AWS IoT Core MQTT on EC21 vs EG21

IoT Modules LTE Standard Module
1

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!

2

Hi damienw,
The FW you use is too old, we do not support MQTT protocal on R06A01 version, but we have support this feature on our latest FW, i have send you the FW via emial, pls check your email, thank you.

3

Hi Duncan,

Perfect. Received, upgraded, and now works as expected.

Thank you for your assistance!