• Make TLS/SSL work
  • current problem: “No subjectAltNames on the certificate match”
• …

https://app.kiloiot.io

User: kalaschnikow@mail.ru

Pass: kiloYA…“6

• MQTT connector
  • Broker URL:

    mqtts://mqtt-iot.kiloiot.io:1884

  • Topic prefix: iot/8d3bccea-df38-4874-b70a-00c17d6a4e15/95f199fa-ba9c-4dee-9d61-9b656620ef9b
    • If device name is “device1”, then topic name is:
      • iot/8d3bccea-df38-4874-b70a-00c17d6a4e15/95f199fa-ba9c-4dee-9d61-9b656620ef9b/device1
  • Username: mqtt_95f199fa
  • Password: wfqY73FTLfzZ3qT9Mdg66guLGWNdV0bY

• Working “MQTT Settings” for MQTTX (as of 08.10.2026)
  • MQTT version:
    • 5.0
    • 3.1 - worked too (?)
  • SSL / TLS: true
  • Host: mqtt-iot.kiloiot.io
  • Port: 1884
  • Client ID: device1
  • User Name: mqtt_95f199fa
  • Password: wfqY73FTLfzZ3qT9Mdg66guLGWNdV0bY
  • Topic: iot/8d3bccea-df38-4874-b70a-00c17d6a4e15/95f199fa-ba9c-4dee-9d61-9b656620ef9b/device1
  • Data sent:

    {"msg": "msg_20260821102105","lat": 49.04223684221506,"lon": 8.722192514687777}

• Working “MQTT Settings” for Glomus app (as of 08.10.2026)
  • MQTT version:
    • 5.0
  • SSL / TLS: true
  • Host: mqtt-iot.kiloiot.io
  • Port: 1884
  • Client ID: device1
  • User Name: mqtt_95f199fa
  • Password: wfqY73FTLfzZ3qT9Mdg66guLGWNdV0bY
  • Topic: iot/8d3bccea-df38-4874-b70a-00c17d6a4e15/95f199fa-ba9c-4dee-9d61-9b656620ef9b/device1
  • Data sent:

    {"msg": "msg_20260821102105","lat": 49.04223684221506,"lon": 8.722192514687777}

OpenRemote

https://docs.openremote.io/docs/user-guide/domains/fleet-management/

• Working “MQTT Settings” for MQTTX (as of 02.10.2026)
  • MQTT version: 3.1
  • SSL / TLS: true
  • Host: awow2024
  • Port: 8883
  • Client ID: mqttx_aaf87899
  • User Name: master:mqttuser
  • Password: h0ZEXtVgEIf0xP1tLDweoU0l6PNuCpFf2GfGpm4rkpabcTdjnHOO174st79s7j1jScPEqsJxZfLk6jSwhAREL1
  • Topic: master/mqttx_aaf87899/writeattributevalue/location/5soNjlXan6x0U9i1hL2G6D
  • Data sent:

    {
      "type": "Point",
      "coordinates": [
        8.72233, 
        49.042166
      ]
    }

https://docs.thinger.io/mqtt

https://demo.thingsboard.io

User: blubbsik@gmx.de

Pass: thingsYA…

A small “How To” by RouterOS: https://help.mikrotik.com/docs/spaces/ROS/pages/166920428/GPS-tracking+using+MQTT+and+ThingsBoard

• MQTTX
  • CLI
  • UI App
    • Ubuntu
    • Windows
    • …

Certificates are in /mnt/sda4/development/_projects/fleet-management/

• myclient.p12
  • PKCS#12 keystore
• myclient.pfx
  • key in pfx
• myclient.pem
  • key in PEM
• myclient.pubkey.pem
  • pubkey ?

• https://keystore-explorer.org
  • tool to create / export certificates etc

A forum post (with example code?) that seems to be interesting: https://community.hivemq.com/t/hivemq-client-mtls-is-failing/1548/2

Example code from google:

import com.hivemq.client.mqtt.MqttClient;
import com.hivemq.client.mqtt.mqtt5.Mqtt5BlockingClient;

import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.TrustManagerFactory;
import java.io.FileInputStream;
import java.io.InputStream;
import java.security.KeyStore;

public class MqttSslExample {

    public static void main(String[] args) {
        try {
            // 1. Pfade und Passwörter definieren
            String truststorePath = "pfad/zu/client-truststore.jks";
            String truststorePassword = "truststore_passwort";

            String keystorePath = "pfad/zu/client-keystore.p12"; // Oft PKCS12 (.p12/.pfx)
            String keystorePassword = "keystore_passwort";

            // 2. TrustManagerFactory initialisieren (Zertifikat des Brokers validieren)
            KeyStore trustStore = KeyStore.getInstance("JKS"); // oder "PKCS12"
            try (InputStream tsIn = new FileInputStream(truststorePath)) {
                trustStore.load(tsIn, truststorePassword.toCharArray());
            }
            TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
            trustManagerFactory.init(trustStore);

            // 3. KeyManagerFactory initialisieren (Eigenes Client-Zertifikat für mTLS - Optional)
            KeyStore keyStore = KeyStore.getInstance("PKCS12"); 
            try (InputStream ksIn = new FileInputStream(keystorePath)) {
                keyStore.load(ksIn, keystorePassword.toCharArray());
            }
            KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
            keyManagerFactory.init(keyStore, keystorePassword.toCharArray());

            // 4. HiveMQ MQTT Client mit SSL-Konfiguration bauen
            Mqtt5BlockingClient client = MqttClient.builder()
                    .useMqttVersion5()
                    .serverHost("ihr-secure-broker.de")
                    .serverPort(8883)
                    .sslConfig()
                        .trustManagerFactory(trustManagerFactory) // Broker-Zertifikat prüfen
                        .keyManagerFactory(keyManagerFactory)     // Client-Zertifikat mitsenden (mTLS)
                    .applySslConfig()
                    .buildBlocking();

            // Client verbinden
            client.connect();
            System.out.println("Erfolgreich über TLS verbunden!");
            
            client.disconnect();

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Also interesting :

• Google search
• Security features of HiveMQ - HiveMQ docs

• MQTT Essentials by HiveMQ
  • very good resource

• https://www.hivemq.com/mqtt/mqtt-security-fundamentals/ MQTT Security Fundamentals - a series by HiveMQ
  • …
  • TLS/SSL - MQTT Security Fundamentals
    • more info about TLS: https://hpbn.co/transport-layer-security-tls/
  • …

• https://www.emqx.com/en/blog/fortifying-mqtt-communication-security-with-ssl-tls

• HiveMQ MQTT Client
  • https://hivemq.github.io/hivemq-mqtt-client/
  • Repo: https://github.com/hivemq/hivemq-mqtt-client

• Eclipse Paho
  • https://eclipse.dev/paho/
  • Repo: https://github.com/eclipse-paho/paho.mqtt.android
  • Pros
    • …
  • Cons
    • too old?

• Misc
  • Nice article about MQTT and Android etc:
    • https://medium.com/swlh/android-and-mqtt-a-simple-guide-cb0cbba1931c

• OwnTracks
  • OwnTracks booklet - information about the app
  • OwnTrack in Play Store
  • open source
• SensorSpot
  • https://github.com/umercodez/SensorSpot
  • an MQTT client, which also sends location (and other sensor data available on Android device)
  • open source