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<h1 id="firstHeading" class="firstHeading mw-first-heading">User:Cobalt32/sandbox</h1>

<div id="mw-content-subtitle"><div class="subpages">< <bdi dir="ltr"><a href="../User%3ACobalt32" title="User:Cobalt32">User:Cobalt32</a></bdi></div></div>

</div>

<div id="mw-content-text" class="mw-body-content mw-content-ltr" lang="en" dir="ltr"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="mw-heading mw-heading2"><h2 id="Packet_structure">Packet structure</h2></div>

A Reticulum packet consists of four fields: a header field, destination field, context field, and data field. There is no source field, as packets do not include sender information.

<caption>Reticulum header format

</caption>

<th style="min-width:42px; border-bottom:none; border-right:none;">Offset

</th>

<th style="border-left:none;"><a href="https://en.wikipedia.org/wiki/Octet_(computing)" class="extiw external" title="wikipedia:Octet (computing)">Octet</a>

</th>

<th colspan="8">0

</th>

<th colspan="8">1

</th>

<th colspan="8">2

</th>

<th colspan="8">3

</th></tr>

<tr>

<th style="min-width: 42px;border-top: none;">Octet

</th>

</th>

<th style="min-width:11px;">0

</th>

<th style="min-width:11px;">1

</th>

<th style="min-width:11px;">2

</th>

<th style="min-width:11px;">3

</th>

<th style="min-width:11px;">4

</th>

<th style="min-width:11px;">5

</th>

<th style="min-width:11px;">6

</th>

<th style="min-width:11px;">7

</th>

<th style="min-width:11px;">8

</th>

<th style="min-width:11px;">9

</th>

<th style="min-width:16px;">10

</th>

<th style="min-width:16px;">11

</th>

<th style="min-width:16px;">12

</th>

<th style="min-width:16px;">13

</th>

<th style="min-width:16px;">14

</th>

<th style="min-width:16px;">15

</th>

<th style="min-width:16px;">16

</th>

<th style="min-width:16px;">17

</th>

<th style="min-width:16px;">18

</th>

<th style="min-width:16px;">19

</th>

<th style="min-width:16px;">20

</th>

<th style="min-width:16px;">21

</th>

<th style="min-width:16px;">22

</th>

<th style="min-width:16px;">23

</th>

<th style="min-width:16px;">24

</th>

<th style="min-width:16px;">25

</th>

<th style="min-width:16px;">26

</th>

<th style="min-width:16px;">27

</th>

<th style="min-width:16px;">28

</th>

<th style="min-width:16px;">29

</th>

<th style="min-width:16px;">30

</th>

<th style="min-width:16px;">31

</th></tr>

<tr>

<th style="width:35px;">0

</th>

<th style="width:30px;">0

</th>

</td>

</td>

</td>

</td>

</td>

</td>

<td colspan="8">Hops

</td>

</td></tr>

<tr>

<th style="width:35px;">4

</th>

<th style="width:30px;">32

</th>

</td></tr>

<tr>

<th style="width:35px;">8

</th>

<th style="width:30px;">64

</th>

<td colspan="32" style="border-top: none; border-bottom: none;">Destination

</td></tr>

<tr>

<th style="width:35px;">12

</th>

<th style="width:30px;">96

</th>

</td></tr>

<tr>

<th style="width:35px;">16

</th>

<th style="width:30px;">128

</th>

</td>

<td colspan="8">Context

</td>

</td></tr>

<tr>

<th style="width:35px;">20

</th>

<th style="width:30px;">160

</th>

<td colspan="32" rowspan="3" style="background: mistyrose;border-top: none;">Data

</td></tr>

<tr>

<th>24

</th>

<th>192

</th></tr>

<tr>

<th>⋮

</th>

<th>⋮

</th></tr></tbody></table>

<dl><dt>Access Codes: 1 bit</dt>

<dd>Set to <code>1</code> if the interface has <a href="../IFAC" class="mw-redirect" title="IFAC">IFAC</a> enabled.</dd>

<dt>Header Type: 1 bit</dt>

<dd>Indicates the number of <a href="../Destination" title="Destination">destination</a> hashes included in the destination field. Set to <code>0</code> for a single 16-byte hash. Set to <code>1</code> for two 16-byte hashes.</dd>

<dt>Context Flag: 1 bit</dt>

<dd>The context flag is used for various types of signaling, depending on packet context.</dd>

<dt>Propagation Type: 1 bit</dt>

<dd>Set to <code>0</code> for broadcast propagation. Set to <code>1</code> for transport propagation.</dd>

<dt>Destination Type: 2 bits</dt>

<dd>Indicates the <a href="../Destination" title="Destination">destination</a> type. Set to <code>00</code> for single destination, <code>01</code> for group destination, <code>10</code> for plain destination, and <code>11</code> for <a href="../Link" title="Link">link</a> destination.</dd>

<dt>Packet Type: 2 bits</dt>

<dd>Indicates the packet type. Set to <code>00</code> for data, <code>01</code> for <a href="../Announce" title="Announce">announce</a>, <code>10</code> for <a href="../Link" title="Link">link</a> request, and <code>11</code> for proof.</dd>

<dd>Set to <code>0</code> when sent and incremented whenever the packet is forwarded by a <a href="../Transport_node" title="Transport node">transport node</a>. When a transport node receives a packet with the hops field greater than or equal to the node's maximum hop count, the packet is not forwarded. The default maximum hop count is currently 128.</dd>

<dt>Destination: 16 bytes (128 bits)</dt>

<dd>The <a href="../Destination" title="Destination">destination</a> hash of the intended recipient. If the header type is set to <code>1</code>, there are two 16-byte destination fields.</dd>

<dt>Context: 8 bits</dt>

<dd>Used to determine packet context.</dd>

<dt>Data: Variable</dt>

<dd>The payload of the packet.</dd></dl>

The following CSS should make the header diagram usable by adding vertical lines, reducing the padding, and changing some colors. This is a work in progress.

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