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26 KiB
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Introduction
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WiFi and MQTT by Firmware Type
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CLI Availability by Firmware Build
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CLI Command Availability Matrix
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CLI Commands
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Companion Protocol
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Local Documentation
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Frequently Asked Questions
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Filter policy playground
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Repeater Flood Filtering and Moderation
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GPS Tracking
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GPS Tracking
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Scope
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Freshness
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Companion/Client Nodes
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Recommended Setup
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Updating your node over the air (OTA) - user guide
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Packet Format
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Payload Format
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Telemetry history decoder
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Table of contents
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<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
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Scope
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Freshness
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Companion/Client Nodes
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<a href="#sensor-nodes" class="md-nav__link">
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<span class="md-ellipsis">
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Sensor Nodes
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Advert Location
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Recommended Setup
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<article class="md-content__inner md-typeset">
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<a href="https://github.com/mikecarper/MeshCore/edit/keymindCascade/docs/gps_tracking.md" title="Edit this page" class="md-content__button md-icon" rel="edit">
|
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M10 20H6V4h7v5h5v3.1l2-2V8l-6-6H6c-1.1 0-2 .9-2 2v16c0 1.1.9 2 2 2h4zm10.2-7c.1 0 .3.1.4.2l1.3 1.3c.2.2.2.6 0 .8l-1 1-2.1-2.1 1-1c.1-.1.2-.2.4-.2m0 3.9L14.1 23H12v-2.1l6.1-6.1z"/></svg>
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</a>
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<h1 id="gps-tracking">GPS Tracking</h1>
|
|
<p>This document describes how GPS telemetry works for companion/client nodes and
|
|
sensor nodes.</p>
|
|
<h2 id="scope">Scope</h2>
|
|
<p>GPS tracking uses the existing CayenneLPP GPS telemetry field. It does not add a
|
|
new phone app protocol field.</p>
|
|
<p>The GPS telemetry value contains latitude, longitude, and altitude. Speed,
|
|
heading, and freshness are not sent as separate telemetry fields.</p>
|
|
<p>If the firmware does not have a valid fresh GPS cache, it omits the GPS field
|
|
from telemetry. This is intentional: stale or missing fixes are not reported as
|
|
zero coordinates.</p>
|
|
<h2 id="freshness">Freshness</h2>
|
|
<p>GPS telemetry is cached separately from advert location.</p>
|
|
<p>The cache behavior is:</p>
|
|
<ul>
|
|
<li>Refresh the cached GPS value every 2 hours only when at least one contact or
|
|
ACL client can receive location telemetry.</li>
|
|
<li>Try for up to 15 minutes during a refresh.</li>
|
|
<li>If the position stays within about 100 meters for 30 seconds, cache a weighted
|
|
average of the stable fixes, with newer fixes weighted more heavily.</li>
|
|
<li>If the position moves outside that 100 meter circle during acquisition, cache
|
|
the latest valid fix.</li>
|
|
<li>Omit GPS from telemetry if there is no fix or if the cached fix is more than
|
|
12 hours old.</li>
|
|
</ul>
|
|
<p>When a telemetry request asks for location, GPS is kept on for 2 hours after the
|
|
latest location request. During that hold window, later location telemetry
|
|
requests can use fresh GPS data as soon as valid fixes are available.</p>
|
|
<p>If GPS is manually enabled, it stays on and valid fixes continue to update the
|
|
cache.</p>
|
|
<p>If no contact or ACL client can receive location telemetry, the scheduled
|
|
2-hour refresh does not run. A real location telemetry request still turns GPS
|
|
on for the 2-hour hold window, and manual GPS-on still keeps the cache updated.</p>
|
|
<h2 id="companionclient-nodes">Companion/Client Nodes</h2>
|
|
<p>Companion/client telemetry uses the existing companion telemetry permission
|
|
system:</p>
|
|
<ul>
|
|
<li>base telemetry</li>
|
|
<li>location telemetry</li>
|
|
<li>environment telemetry</li>
|
|
</ul>
|
|
<p>Location telemetry is sent only when the requester's effective telemetry
|
|
permissions include location. Those permissions are derived from the companion
|
|
telemetry mode settings and contact flags.</p>
|
|
<p>The scheduled GPS cache refresh runs only when at least one stored contact has
|
|
effective location telemetry access:</p>
|
|
<ul>
|
|
<li><code>location: allow all</code> with at least one stored contact</li>
|
|
<li><code>location: allow flags</code> with at least one stored contact whose flags include
|
|
location</li>
|
|
</ul>
|
|
<p>No new phone app behavior is required. Existing clients see the existing GPS
|
|
telemetry field when it is present.</p>
|
|
<h2 id="sensor-nodes">Sensor Nodes</h2>
|
|
<p>Sensor telemetry access is controlled by:</p>
|
|
<pre><code class="language-text">get telemetry.access
|
|
set telemetry.access all
|
|
set telemetry.access acl
|
|
</code></pre>
|
|
<p><code>all</code> is the default and matches the previous sensor telemetry behavior. A
|
|
request that reaches the normal sensor telemetry request path can receive the
|
|
requested telemetry fields, including GPS, subject to the request mask and GPS
|
|
freshness rules.</p>
|
|
<p><code>acl</code> gates telemetry through the sensor ACL. A requester with read-only or
|
|
higher permissions receives the existing telemetry set, including GPS. Guest or
|
|
unknown requesters receive no telemetry fields.</p>
|
|
<p>The scheduled GPS cache refresh follows the same access setting:</p>
|
|
<ul>
|
|
<li><code>all</code>: runs only when at least one ACL client exists</li>
|
|
<li><code>acl</code>: runs only when at least one ACL client is read-only or higher</li>
|
|
</ul>
|
|
<p>Use the existing ACL command to grant access:</p>
|
|
<pre><code class="language-text">setperm <pubkey> 1
|
|
</code></pre>
|
|
<p>Permission values:</p>
|
|
<ul>
|
|
<li><code>1</code>: read-only, suitable for telemetry access</li>
|
|
<li><code>2</code>: read-write</li>
|
|
<li><code>3</code>: admin</li>
|
|
</ul>
|
|
<h2 id="advert-location">Advert Location</h2>
|
|
<p>Advert location is separate from telemetry GPS. The advert policy is controlled
|
|
with:</p>
|
|
<pre><code class="language-text">gps advert
|
|
gps advert none
|
|
gps advert share
|
|
gps advert prefs
|
|
</code></pre>
|
|
<p>Policies:</p>
|
|
<ul>
|
|
<li><code>none</code>: do not include location in adverts</li>
|
|
<li><code>share</code>: use the live/shared sensor manager location</li>
|
|
<li><code>prefs</code>: use the stored node latitude and longitude preferences</li>
|
|
</ul>
|
|
<p>Telemetry GPS can be fresh while advert location is fixed or disabled, depending
|
|
on this policy.</p>
|
|
<h2 id="recommended-setup">Recommended Setup</h2>
|
|
<p>For private sensor tracking:</p>
|
|
<pre><code class="language-text">set telemetry.access acl
|
|
setperm <owner_pubkey> 3
|
|
setperm <trusted_pubkey> 1
|
|
</code></pre>
|
|
<p>For compatibility with the older sensor behavior:</p>
|
|
<pre><code class="language-text">set telemetry.access all
|
|
</code></pre>
|
|
<p>For GPS telemetry behavior, leave the phone app unchanged. The firmware omits
|
|
GPS when it is stale or missing and sends the existing GPS telemetry field when
|
|
fresh data is available.</p>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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</article>
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</div>
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