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HaloKeymind/telemetry_decoder/index.html
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Ota meshtower v2 sdcard
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Esp32 partition catalog
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Esp32 wifi partition migration
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Heltec v4 wifi partition migration
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Radio, networking, and power
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Radio profiles
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Private fleet management
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Espnow bridge setup
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WiFi
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Flood filtering
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Gps tracking
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Companion lost reply
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Sensor tracker
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<h1 id="telemetry-decoder">Telemetry decoder</h1>
<p>The decoder runs on the documentation website. GitHub's Markdown preview shows
the instructions but cannot run the decoder's buttons or JavaScript.</p>
<p>Paste raw hexadecimal packet data copied from the
<a href="https://analyzer.letsmesh.net/packets">Let's Mesh packet analyzer</a> to decode a
repeater's scheduled temperature, battery-voltage, or external I2C-voltage
snapshot. The decoder also accepts the payload hex without its MeshCore packet
header and the Base64 pages returned by repeater or room-server CLI commands.
Decoding happens entirely in this browser; pasted data is not uploaded or sent
anywhere.</p>
<p>The <strong>Source ID</strong> in a raw-packet result is the first eight bytes of the sending
repeater's public key. Match that 16-character hex value against the public-key
prefix recorded for your repeaters. It comes from the telemetry payload itself,
so it is available even when only the payload was copied.</p>
<h2 id="send-raw-telemetry-packets">Send raw telemetry packets</h2>
<p>From an administrator CLI session, first configure a direct route to the MQTT
observer that will receive and upload the raw packets. Use <code>direct</code> when the
observer is a zero-hop neighbor:</p>
<pre><code class="language-text">set data.tx path direct
send telemetry.tx now
</code></pre>
<p>For a routed observer, provide its comma-separated hop hashes instead:</p>
<pre><code class="language-text">set data.tx path A1B2,C3D4
send telemetry.tx now
</code></pre>
<p>The shared route does not enable telemetry. Automatic telemetry is off on a
fresh install; to explicitly keep the route manual-only before sending:</p>
<pre><code class="language-text">set telemetry.tx schedule off
send telemetry.tx now
</code></pre>
<p>The <code>send telemetry.tx now</code> command queues one <code>TTB1</code> temperature packet, one
<code>TVB1</code> battery-voltage packet, and <code>IVB1</code> chunks for every connected I2C voltage
channel. <code>TTB1</code> and <code>TVB1</code> carry up to 165 samples. Each <code>IVB1</code> carries 64, so a
full 192-point/four-day channel takes three packets. Channels whose retained
history is entirely zero are treated as disconnected and are not sent. The
command requires at least one collected base sample and works even when the
automatic schedule is off.</p>
<p>Schedule changes are saved transactionally; a failed write does not truncate
the previous preferences. A legacy route must be successfully migrated into
<code>data.tx</code> before its schedule can run. Corrupt, unreadable, or ambiguously
committed preferences stop automatic and pending sends. <code>get telemetry.tx</code>
shows <code>fault=prefs</code>, and manual sends return an error instead of acknowledging
work that cannot run. Such a storage fault must be repaired before settings
can be changed; the firmware does not overwrite an unmigrated legacy file.</p>
<h2 id="decode-a-packet">Decode a packet</h2>
<p>If you are reading this on GitHub, <a href="https://mikecarper.github.io/MeshCore/telemetry_decoder/#decode-a-packet">open the working decoder on the documentation
website</a>
to paste a packet, load an example, or download CSV.</p>
<div class="telemetry-tool" data-telemetry-decoder>
<p>Enable JavaScript on the documentation website to use the decoder.</p>
</div>
<h2 id="analyzer-hex-examples">Analyzer hex examples</h2>
<p>The buttons load synthetic, protocol-valid zero-hop RAW_CUSTOM packets. A real
scheduled snapshot normally has 165 samples and is much longer. Routed packets
also contain path bytes before the <code>TTB1</code> or <code>TVB1</code> payload magic; the decoder
finds and validates the payload automatically.</p>
<h3 id="temperature">Temperature</h3>
<pre><code class="language-text">3E00545442311122334455667788800092651E0008000102354A4E5082
</code></pre>
<h3 id="battery-voltage">Battery voltage</h3>
<pre><code class="language-text">3E00545642311122334455667788800092651E000800010264C8FEFFDC
</code></pre>
<h3 id="external-i2c-voltage">External I2C voltage</h3>
<pre><code class="language-text">3E00495642311122334455667788800092651E00020800000004019026927109C427107FFF
</code></pre>
<p>All three examples identify the source as <code>1122334455667788</code>.</p>
<h2 id="cli-history-pages">CLI history pages</h2>
<p>The same page continues to decode the padded Base64 returned by these
administrator commands:</p>
<table>
<thead>
<tr>
<th>Data</th>
<th>Newest page</th>
<th>Older-page example</th>
<th>Samples per page</th>
</tr>
</thead>
<tbody>
<tr>
<td>MCU temperature</td>
<td><code>get telemetry.temp</code></td>
<td><code>get telemetry.temp 2</code></td>
<td>48 (24 hours)</td>
</tr>
<tr>
<td>Battery voltage</td>
<td><code>get telemetry.volt</code></td>
<td><code>get telemetry.volt 3</code></td>
<td>48 (24 hours)</td>
</tr>
<tr>
<td>I2C voltage</td>
<td><code>get telemetry.volt.i2c 2</code></td>
<td><code>get telemetry.volt.i2c 2 4</code></td>
<td>48 (24 hours)</td>
</tr>
<tr>
<td>GPS position</td>
<td><code>get telemetry.gps</code></td>
<td><code>get telemetry.gps 2</code></td>
<td>24 (12 hours)</td>
</tr>
</tbody>
</table>
<p>Paste either the complete reply beginning with <code>&gt;</code> or Base64 alone. For
example:</p>
<pre><code class="language-text">get telemetry.volt 1
&gt; EkDUcWoeMAAB5+bl5eTj4uLh4ODf3t7d3Nvb2tnZ2NfX1tXU1NPS0tHQ0M/Ozc3My8vKycnI/w==
</code></pre>
<p>Run <code>get telemetry.volt.i2c</code> without a channel first to list connected
channels. For each channel, collect pages <code>1</code> through <code>4</code>. Paste all four reply
lines into the decoder at once; it merges their timestamps into one 192-point,
four-day table and downloads them as one CSV. The same merging works for the
three <code>IVB1</code> analyzer packets from a full channel. Inputs must have the same
telemetry type, source, LPP channel, and sample interval.</p>
<p>An INA3221 exposes its three enabled hardware inputs as three consecutive LPP
channels. When it is the only external sensor these are normally <code>2</code>, <code>3</code>, and
<code>4</code>, in hardware-input order. Other sensors can shift the numbers, so copy the
IDs reported by <code>get telemetry.volt.i2c</code> rather than assuming them.</p>
<h2 id="reading-the-table">Reading the table</h2>
<ul>
<li>Timestamps default to UTC. Select <strong>Show browser-local time</strong> to convert
them for display and CSV export.</li>
<li><code>TTB1</code> means a raw temperature snapshot, <code>TVB1</code> a raw battery-voltage
snapshot, and <code>IVB1</code> a packed external I2C-voltage chunk. The input summary
also reports the MeshCore route and path-hop count when a complete packet was
pasted.</li>
<li>Temperature preserves exact whole degrees from <code>-50 C</code> through <code>+77 C</code>, plus
missing, below-range, and above-range states.</li>
<li>Voltage preserves hundredths of a volt from <code>1.88 V</code> through <code>4.40 V</code>, plus
missing and out-of-range states.</li>
<li>External I2C voltage uses a 15-bit code at <code>0.02 V</code> resolution. Code <code>0</code> is
missing/disconnected; codes <code>1</code> through <code>32767</code> cover <code>0.02 V</code> through
<code>655.34 V</code>. The LPP channel remains part of every page and raw chunk so
multiple monitor inputs cannot be mixed accidentally.</li>
<li>GPS positions are reconstructed from signed 10-meter differentials. A zero
differential after the page origin is inherently ambiguous: it can represent
an unchanged fix, movement below the encoded resolution, or no fix. The table
labels those rows rather than inventing a coordinate.</li>
<li>A GPS clipping warning means at least one movement exceeded the differential
range, so positions after that point can be less accurate.</li>
</ul>
<p>GPS history remains available through the administrator CLI, but <code>telemetry.tx</code>
never puts GPS in RAW_CUSTOM packets. Location data therefore must come from a
CLI Base64 page rather than analyzer hex.</p>
<p>For the byte-level layouts, see
<a href="../cli_commands/#read-repeater-telemetry-history">Read repeater telemetry history</a>.</p>
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