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</code></pre></div></div> <p>A gateway node with internet access (WiFi or Ethernet) publishes mesh messages to an MQTT topic. Remote gateways subscribed to the same topic inject those messages into their local mesh.</p> <h2 id="configuration"> <a href="#configuration" class="anchor-heading" aria-labelledby="configuration"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> Configuration </h2> <h3 id="enabling-mqtt"> <a href="#enabling-mqtt" class="anchor-heading" aria-labelledby="enabling-mqtt"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> Enabling MQTT </h3> <ol> <li>Navigate to <strong>Settings → Module Config → MQTT</strong>.</li> <li>Enable the MQTT module.</li> <li>Configure the broker connection:</li> </ol> <p><img src="../../assets/screenshots/settings_switch.png" alt="MQTT toggle switch" /></p> <div class="table-wrapper"><table> <thead> <tr> <th>Setting</th> <th>Descriere</th> <th>Prestabilit</th> </tr> </thead> <tbody> <tr> <td>Server Address</td> <td>MQTT broker hostname</td> <td>mqtt.meshtastic.org</td> </tr> <tr> <td>Nume de utilizator</td> <td>Broker authentication</td> <td>meshdev</td> </tr> <tr> <td>Parolă</td> <td>Broker authentication</td> <td>large4cats</td> </tr> <tr> <td>Root Topic</td> <td>Base topic for messages</td> <td>msh</td> </tr> <tr> <td>Encryption</td> <td>Encrypt MQTT payload</td> <td>Activat</td> </tr> <tr> <td><del>JSON Output</del></td> <td>⚠️ <strong>Deprecated</strong> — JSON packet support has been removed from firmware; this field is ignored</td> <td>Disabled</td> </tr> <tr> <td>TLS</td> <td>Secure connection to broker</td> <td>Disabled</td> </tr> <tr> <td>Map Reporting</td> <td>Report position to public map</td> <td>Disabled</td> </tr> </tbody> </table></div> <h3 id="mqtt-proxy-on-this-phone"> <a href="#mqtt-proxy-on-this-phone" class="anchor-heading" aria-labelledby="mqtt-proxy-on-this-phone"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> MQTT Proxy on This Phone </h3> <p>If your node has no internet access of its own, it can use the connected phone as its MQTT gateway: enable <strong>MQTT</strong> and <strong>Proxy to client enabled</strong> in the module config, and the app relays MQTT traffic between the radio and the broker over your phone’s internet connection.</p> <p>The <strong>MQTT proxy on this phone</strong> toggle at the top of the MQTT settings screen shows whether this relay is currently running and lets you cut it off (or restart it) immediately — without editing and re-saving the device’s MQTT configuration.</p> <h3 id="default-meshtastic-broker"> <a href="#default-meshtastic-broker" class="anchor-heading" aria-labelledby="default-meshtastic-broker"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> Default Meshtastic Broker </h3> <p>The community maintains a public broker at <code class="language-plaintext highlighter-rouge">mqtt.meshtastic.org</code>. This is intended for general use and testing.</p> <blockquote> <p>ℹ️ <strong>Note:</strong> Connections to <code class="language-plaintext highlighter-rouge">mqtt.meshtastic.org</code> always use TLS (port 8883), even if the TLS toggle is off. For any other broker, TLS is used only when you enable it (port 8883 with TLS, 1883 without).</p> </blockquote> <blockquote> <p>🔒 <strong>Privacy:</strong> Messages on the public broker are readable by anyone subscribed. Always use channel encryption for private communications.</p> </blockquote> <h3 id="private-broker"> <a href="#private-broker" class="anchor-heading" aria-labelledby="private-broker"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> Private Broker </h3> <p>For better privacy and control, you can run your own MQTT broker:</p> <ul> <li>Mosquitto (lightweight, open-source)</li> <li>HiveMQ</li> <li>EMQX</li> </ul> <p>Configure your node to point to your private broker with appropriate credentials.</p> <h2 id="map-reporting"> <a href="#map-reporting" class="anchor-heading" aria-labelledby="map-reporting"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> Map Reporting </h2> <p>When Map Reporting is enabled, your node publishes its position to the Meshtastic community map:</p> <ul> <li>Visible at <a href="https://meshmap.net">meshmap.net</a> and similar community map services</li> <li>Only position and node info are shared</li> <li>Disable this if you don’t want your location publicly visible</li> </ul> <h2 id="uplink-vs-downlink"> <a href="#uplink-vs-downlink" class="anchor-heading" aria-labelledby="uplink-vs-downlink"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> Uplink vs Downlink </h2> <div class="table-wrapper"><table> <thead> <tr> <th>Direction</th> <th>Descriere</th> </tr> </thead> <tbody> <tr> <td><strong>Uplink</strong></td> <td>Messages from mesh → MQTT broker</td> </tr> <tr> <td><strong>Downlink</strong></td> <td>Messages from MQTT broker → mesh</td> </tr> </tbody> </table></div> <p>Configure per-channel which directions are active to control message flow and airtime usage.</p> <h2 id="message-formats"> <a href="#message-formats" class="anchor-heading" aria-labelledby="message-formats"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> Message Formats </h2> <p>MQTT uses protobuf message format:</p> <div class="table-wrapper"><table> <thead> <tr> <th>Format</th> <th>Descriere</th> <th>Use case</th> </tr> </thead> <tbody> <tr> <td><strong>Protobuf</strong></td> <td>Binary Meshtastic protobuf encoding</td> <td>Node-to-node mesh bridging</td> </tr> </tbody> </table></div> <blockquote> <p>⚠️ <strong>Note:</strong> JSON output support was removed from firmware. The <code class="language-plaintext highlighter-rouge">json_enabled</code> setting is still visible in the app for legacy compatibility but has no effect on current firmware versions.</p> </blockquote> <h2 id="encryption--privacy"> <a href="#encryption--privacy" class="anchor-heading" aria-labelledby="encryption--privacy"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> Encryption &amp; Privacy </h2> <p>Understanding the layered encryption model:</p> <ol> <li><strong>Channel encryption</strong> happens on the mesh <em>before</em> MQTT. If your channel has a PSK, the MQTT payload is already encrypted — the broker and any subscribers see only the ciphertext.</li> <li><strong>MQTT encryption</strong> (the module setting) adds an additional encryption layer for transit to the broker. This protects metadata and routing information.</li> <li><strong>TLS</strong> encrypts the TCP connection to the broker itself, preventing network-level eavesdropping.</li> </ol> <blockquote> <p>🔒 <strong>Important:</strong> The default public channel has a well-known key. Messages on the default channel sent via MQTT are effectively <strong>unencrypted</strong> — anyone can decode them. Always use a custom PSK for private communications.</p> </blockquote> <h2 id="best-practices"> <a href="#best-practices" class="anchor-heading" aria-labelledby="best-practices"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> Best Practices </h2> <ul> <li>Use channel-level encryption (PSK) on channels that bridge to MQTT</li> <li>Don’t enable MQTT on nodes without internet access (it will buffer and waste memory)</li> <li>Use a private broker for sensitive deployments</li> <li>Be mindful of airtime when downlinking messages from busy MQTT topics — every downlinked message consumes radio airtime on your local mesh</li> <li>Consider enabling uplink-only if you only need to monitor your mesh remotely without injecting messages back</li> </ul> <h2 id="troubleshooting"> <a href="#troubleshooting" class="anchor-heading" aria-labelledby="troubleshooting"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> Troubleshooting </h2> <h3 id="mqtt-not-connecting"> <a href="#mqtt-not-connecting" class="anchor-heading" aria-labelledby="mqtt-not-connecting"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> MQTT Not Connecting </h3> <ul> <li><strong>Check WiFi</strong> — the gateway node must have an active internet connection (WiFi or Ethernet). MQTT does not work over the LoRa radio link itself.</li> <li><strong>Verify credentials</strong> — incorrect username or password will silently fail on most brokers. Double-check for trailing spaces.</li> <li><strong>Firewall</strong> — port 1883 (MQTT) or 8883 (MQTT+TLS) must be open. Some networks block non-standard ports.</li> <li><strong>DNS resolution</strong> — if using a custom broker hostname, verify the node can resolve it. Try the broker’s IP address directly.</li> </ul> <h3 id="messages-not-bridging"> <a href="#messages-not-bridging" class="anchor-heading" aria-labelledby="messages-not-bridging"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> Messages Not Bridging </h3> <ul> <li><strong>Check uplink/downlink settings</strong> — if only uplink is enabled, messages flow from mesh to MQTT but not back. Enable downlink on the receiving gateway.</li> <li><strong>Channel mismatch</strong> — both gateways must share the same channel with the same PSK. A mismatch means messages are encrypted with different keys and appear as garbage.</li> <li><strong>Topic mismatch</strong> — ensure both gateways use the same root topic. The default <code class="language-plaintext highlighter-rouge">msh</code> works for the public broker.</li> </ul> <h2 id="related-topics"> <a href="#related-topics" class="anchor-heading" aria-labelledby="related-topics"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> Related Topics </h2> <ul> <li><a href="settings-module-admin">Settings — Modules &amp; Admin</a> — MQTT module configuration reference</li> <li><a href="messages-and-channels">Messages &amp; Channels</a> — channel encryption and PSK setup</li> <li><a href="https://meshtastic.org/docs/software/integrations/mqtt">MQTT integration guide</a> — detailed MQTT documentation on meshtastic.org</li> </ul><hr /> </div> <style> .locale-page-banner { background: rgba(103, 234, 148, 0.1); border: 1px solid rgba(103, 234, 148, 0.3); border-radius: 12px; padding: 10px 16px; margin-bottom: 1.5rem; font-size: 0.85rem; } .locale-notice a { margin-left: 12px; font-weight: 500; } </style> </main> <hr> <footer> <footer class="site-footer"> Copyright &copy; 2026 Meshtastic LLC. 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