MQTT using TLS/SSL

Technical Subjects
1

Hai

I am trying to connect and send data using MQTT. When using the open-source broker (broker.emqx.io on port 8883), the connection is successful, and I am able to publish data. However, when using the dedicated server (rb4d38e0.ala.asia-southeast1.emqxsl.com on port 8883), the connection is established, but publishing does not work

Am i missing something,

Thanks in advance.

2

Could you provide the version of the modem you are using and the detailed AT log?

AT+QGMR

3

@herbert.pan-Q : EG800AKCN90LCR07A05M02

4

Could you provide the detailed AT log?

5

@herbert.pan-Q :

[2025-06-10_16:06:43:305]AT+QMTCFG=“SSL”,1,1,2

[2025-06-10_16:06:43:305]OK
[2025-06-10_16:06:44:800]AT+QMTCFG=“keepalive”,1,3600

[2025-06-10_16:06:44:800]OK
[2025-06-10_16:06:47:159]OPEN COMMAND---->
[2025-06-10_16:06:47:680]
[2025-06-10_16:06:47:680]+QMTOPEN: 1,0
[2025-06-10_16:06:53:031]CONNECT COMMAND---->
[2025-06-10_16:06:53:189]+QMTCONN: 1,0,5

[2025-06-10_16:06:53:189]+QMTSTAT: 1,4

Please refer to the AT log.

Note: I am not supposed to send the credentials in a public forum.

6

I expect that you can send the CA certificate and the AT logs you executed to my email herbert.pan@quectel.com;

7

@herbert.pan-Q

Please check the mail I have sent you the AT logs in mail.

8

If there is no CA certificate, please perform the following Setting
AT+QMTCFG=“SSL”,1,1,0

9

@herbert.pan-Q :
Still the same issue occurs,

But with different server there is no issue arising.

10

Could you output all the AT logs you have executed?