RE: nRF9160 SLM MQTT Connection

KR0731 — Tue, 08 Jul 2025 16:51:43 GMT

I was able to get the connection to work, both with the MQTT sample and the SLM. Looks like it was the certificate was incorrect.

Thanks for the help anyways.

RE: nRF9160 SLM MQTT Connection

KR0731 — Tue, 08 Jul 2025 15:21:43 GMT

Hi Benjamin,

I tried the connection with the MQTT sample from ncs 2.8.0. Looks like the connection is refused.

I had to modify the example to use the username and password. I edited the transport.c file and added to the conn_params variable:

struct mqtt_helper_conn_params conn_params = {

.hostname.ptr = "myServerAddress",

.hostname.size = strlen("myServerAddress"),

.device_id.ptr = client_id,

.device_id.size = strlen(client_id),

.user_name.ptr = "Username",

.user_name.size = strlen("Username"),

.password.ptr = "Password",

.password.size = strlen("Password"),

};

Is it possible that this is an issue with the certificate? I have used it with other devices and had no issue (ESP32 over wifi and Quectel BG95 LTE).

I have had problems in the past with Server Name Indication (SNI) when connecting to these hiveMQ servers. Any way to tell why the connection is refused?

Thanks for the help,

Kevin

RE: nRF9160 SLM MQTT Connection

Benjamin — Mon, 07 Jul 2025 07:08:31 GMT

Hi Kevin,
Have you tried connecting to HiveMQ using one of the simpler MQTT samples?