ScotMesh: New page: reaching Reticulum through a MeshCore or Meshtastic radio via the gateway at The Pole

2026-09-17T10:48:04Z

New page: reaching Reticulum through a MeshCore or Meshtastic radio via the gateway at The Pole

New page

This page is for people who already have a '''MeshCore''' or '''Meshtastic''' radio and want to use it to reach Reticulum, with no internet connection and no [[RNode]]. If you have never heard of Reticulum, start with [[What Reticulum is|what Reticulum is]] and come back.

== What you are actually doing ==

Reticulum runs on your computer as usual. Normally it reaches the network over the internet ([[Connecting to ScotMesh]]) or over an [[RNode]]. Here it uses '''your MeshCore or Meshtastic radio''' as its link instead.

Reticulum's traffic is cut into small pieces and sent on a separate, private channel on your radio. A ScotMesh gateway on the same channel puts the pieces back together and passes them on to [[The ScotMesh Backbone|the backbone]]. That gateway is at '''The Pole''' in Cadham, and it is listed on node maps as ''ScotMesh RNode Cadham''.

Your radio keeps working for its own network at the same time. MeshCore or Meshtastic users around you never see the tunnel, because it runs on its own channel with its own key.

== Is this for you? ==

{| class="wikitable"
! If you have… !! Use
|-
| An internet connection, even a slow one || [[Connecting to ScotMesh]]. It is faster and costs no airtime.
|-
| An RNode, or a board you could flash as one || [[RNode]]. Reticulum runs natively on it and is many times faster.
|-
| Only a MeshCore or Meshtastic radio, within reach of the gateway || '''This page.'''
|}

Expect it to be '''slow'''. It is fine for messages (LXMF), the [[The chat room|chat room]] and small [[Nomad Network]] pages. It is no good for files or voice.

== The two routes ==

{| class="wikitable"
! !! Over MeshCore !! Over Meshtastic
|-
| '''Status''' || '''Working''' — gateway live at The Pole || '''Working''' — gateway live at The Pole since 17 September 2026. New, so tell us how it goes.
|-
| '''Your radio''' || MeshCore '''companion''' firmware v1.17 or later, over USB, Bluetooth or WiFi || Any Meshtastic node, over USB, Bluetooth or WiFi
|-
| '''Radio settings''' || UK/EU Narrow: 869.618 MHz, 62.5 kHz, SF8, CR 4/8 || EU_868, LongFast
|-
| '''Region''' || <code>sco</code> || —
|-
| '''Software''' || <code>MeshCore_Raw_Interface.py</code> from [https://github.com/ScotMesh/RNS_Over_Meshcore ScotMesh/RNS_Over_Meshcore] || <code>Meshtastic_Interface.py</code> from [https://github.com/ScotMesh/RNS_Over_Meshtastic ScotMesh/RNS_Over_Meshtastic]
|-
| '''Speed''' || At best a few hundred bytes a second || Slower: one piece of up to 155 bytes every 8 seconds on LongFast
|}

== Before you start ==

* '''Reticulum installed''' on a computer ([[Installing Reticulum]]), or '''MeshChatX''' ([[Choosing a client]]).
* '''Your radio''', connected to that computer.
* '''A path to the gateway''': in range of The Pole, or reaching it through MeshCore repeaters that relay the <code>sco</code> region.
* '''The tunnel channel details''', in the table below.

== Tunnel details ==

These are shared on purpose, so anyone can join the tunnel. The channel key only keeps the tunnel's traffic separate from ordinary channels; it is not what keeps you private. Reticulum encrypts everything you send end to end, whatever it travels over.

{| class="wikitable"
! !! MeshCore !! Meshtastic
|-
| '''Channel name''' || <code>RNSTunnel</code> || <code>RNS</code>
|-
| '''Secret''' || <code>38a46b4349a14b05c70328f444932033</code> || in the link below
|-
| '''Add it with''' || Reticulum sets it on your radio for you (step 3) || [https://meshtastic.org/e/?add=true#CicSIKzMw9L_sPDY_S2bF9AB3mRvgeyDwAhw9K6HLEBEzbc9GgNSTlMSCAgBOANAA0gB this channel link] — opens in the Meshtastic app and adds the channel next to your own
|-
| '''Region''' || <code>sco</code> || —
|}

-----

== Over MeshCore ==

[[File:Reticulum over MeshCore.svg|center|frameless|upright=3.2|alt=Diagram: Reticulum on your computer talks to your MeshCore companion radio over USB, Bluetooth or WiFi. The radio carries the tunnel on the RNSTunnel channel, directly or through MeshCore repeaters in region sco, to The Pole at Cadham, where the openHop repeater hands it to the RNSBridge companion and rnsd, which connects to the ScotMesh backbone over TCP. Broadcasts go as flooded channel datagrams of up to 148 bytes; traffic to a known peer goes as raw packets of up to 140 bytes along the repeater path.|How Reticulum travels over MeshCore to the ScotMesh backbone]]

=== 1. Set up the radio ===

# Flash '''companion''' firmware, v1.17 or later. Earlier versions lack the two commands the tunnel uses. Repeater or room server firmware will not work.
# Set the radio to '''UK/EU Narrow''': 869.618 MHz, 62.5 kHz, SF8, coding rate 4/8.
# '''Pick a spare channel slot''' for the tunnel, such as 7. Reticulum writes its channel into that slot when it connects, so '''do not use 0''': on most radios that is your Public channel, and it would be replaced.

A companion radio talks to one app at a time. While Reticulum is using it, your phone's MeshCore app cannot connect, and the other way round.

=== 2. Get the interface ===

Download <code>Interface/MeshCore_Raw_Interface.py</code> from [https://github.com/ScotMesh/RNS_Over_Meshcore ScotMesh/RNS_Over_Meshcore] and put it in Reticulum's <code>interfaces</code> folder:

{| class="wikitable"
! System !! Folder
|-
| Linux, macOS || <code>~/.reticulum/interfaces/</code>
|-
| Windows || <code>C:\Users\<you>\.reticulum\interfaces\</code>
|}

Create the folder if it is not there. The interface needs nothing beyond Reticulum itself, plus one library for your connection:

<syntaxhighlight lang="text">pip install pyserial # USB
pip install bleak # Bluetooth</syntaxhighlight>
Use <code>~/reticulum/bin/pip</code> instead if you installed Reticulum in a virtual environment. WiFi (TCP) needs nothing extra.

=== 3. Add it to your config ===

Add this block under <code>[interfaces]</code> in your Reticulum config file (where to find it: [[Connecting to ScotMesh#3. Find the config file|Connecting to ScotMesh]]). Keep exactly one of the three connection blocks.

<syntaxhighlight lang="ini"> [[ScotMesh over MeshCore]]
type = MeshCore_Raw_Interface
interface_enabled = yes

# USB
transport = serial
port = /dev/ttyUSB0 # Windows: COM3 or similar
baudrate = 115200

# Bluetooth - instead of the USB lines
# transport = ble
# ble_name = MeshCore # part of the radio's Bluetooth name

# WiFi - instead of the USB lines
# transport = tcp
# host = 192.168.1.50 # the radio's address
# tcp_port = 5000

# The ScotMesh tunnel
channel_idx = 7 # a spare slot, never 0
channel_name = RNSTunnel
channel_secret = 38a46b4349a14b05c70328f444932033
flood_scope = sco

# You are an end user, not a relay
can_route = no</syntaxhighlight>
Leave <code>mode</code> out: the default is right for an end user.

=== 4. Start it and check ===

# Start Reticulum: <code>rnsd</code>, or restart it if it was already running.
# Run <code>rnstatus</code>. '''ScotMesh over MeshCore''' should be listed as '''Up'''.
# Look for the ScotMesh node. The first answer can take a minute or two over radio.

<syntaxhighlight lang="text">rnpath 10a839df2c50635bcb0c8a299b9ca0f8</syntaxhighlight>
A reply such as ''Path found … via … on MeshCore_Raw_Interface'' means you are through. From here everything in [[Services and addresses]] works, just slowly.

=== With MeshChatX instead ===

# Open '''Settings''', then '''Interfaces''', and install a custom interface module. Upload <code>MeshCore_Raw_Interface.py</code>.
# Add an interface of type <code>MeshCore_Raw_Interface</code> with the same settings as the block above.
# Restart when asked.

MeshChatX already includes the USB and Bluetooth libraries.

On an '''Android phone''', Sideband can only use the WiFi (TCP) connection. See the fork's README for its service plugin.

-----

== Over Meshtastic ==

[[File:Reticulum over Meshtastic.svg|center|frameless|upright=3.2|alt=Diagram: Reticulum on your computer talks to your Meshtastic node over USB, Bluetooth or WiFi. The node carries the tunnel on its RNS channel, on EU_868 LongFast, directly or through other Meshtastic nodes, to The Pole at Cadham, where RepeaterTastic's radio hands it to the hosted node RSN Bridge and rnsd, which connects to the ScotMesh backbone over TCP. Each Reticulum packet is cut into pieces of up to 155 bytes, sent one every 8 seconds, and missing pieces are asked for again.|How Reticulum travels over Meshtastic to the ScotMesh backbone]]

=== 1. Set up the radio ===

# Any Meshtastic node on '''EU_868''' with the '''LongFast''' preset, which is the default in the UK.
# Open the [https://meshtastic.org/e/?add=true#CicSIKzMw9L_sPDY_S2bF9AB3mRvgeyDwAhw9K6HLEBEzbc9GgNSTlMSCAgBOANAA0gB channel link] on the phone or computer your node is paired with. It adds a channel called <code>RNS</code> next to your own.
# In the Meshtastic app's channel list, '''note which slot <code>RNS</code> landed in'''. It is usually 1, the first slot after your primary channel.

Your normal channels keep working. The node can stay paired with your phone while Reticulum uses it over USB or WiFi.

=== 2. Get the Meshtastic interface ===

Download <code>Interface/Meshtastic_Interface.py</code> from [https://github.com/ScotMesh/RNS_Over_Meshtastic ScotMesh/RNS_Over_Meshtastic] into Reticulum's <code>interfaces</code> folder (the same folder as for [[#2. Get the interface|MeshCore]]). It needs the Meshtastic library:

<syntaxhighlight lang="text">pip install meshtastic</syntaxhighlight>
'''Use ScotMesh's copy, not the original.''' The original can only use your primary channel, and it sends pieces too big for the gateway.

=== 3. Add the Meshtastic block to your config ===

Keep exactly one of the three connection lines.

<syntaxhighlight lang="ini"> [[ScotMesh over Meshtastic]]
type = Meshtastic_Interface
enabled = yes

port = /dev/ttyUSB0 # USB (Windows: COM3 or similar)
# tcp_port = 192.168.1.60 # WiFi: the node's address
# ble_port = Meshtastic_1234 # Bluetooth: the node's name

data_speed = 0 # LongFast
channel_index = 1 # the slot RNS landed in
hop_limit = 3</syntaxhighlight>
Leave <code>mode</code> out, as for MeshCore.

=== 4. Start it and check it ===

As for MeshCore:
# Start <code>rnsd</code>.
# Check that '''ScotMesh over Meshtastic''' is '''Up''' in <code>rnstatus</code>.
# Run <code>rnpath 10a839df2c50635bcb0c8a299b9ca0f8</code>.

Allow a few minutes: Meshtastic sends only one piece every 8 seconds.

-----

== Keeping the air clear ==

The UK band these radios use allows each transmitter only '''10% of the time''', and everyone shares it.
* '''Do not set <code>mode = gateway</code>''' on your end. A gateway pushes every route it knows onto the radio and can flood the channel.
* '''Do not turn on <code>enable_transport</code>''' just for this. Your machine does not need to relay for others.
* '''Send messages, not files.''' A single photo can hold the channel for many minutes.
* '''Keep <code>can_route = no</code>''' unless ScotMesh has asked you to run a relay.

== If it does not work ==

{| class="wikitable"
! What you see !! Try
|-
| The interface is not listed in <code>rnstatus</code> || The file is not in the <code>interfaces</code> folder, or <code>type</code> is misspelt. Check the Reticulum log.
|-
| Listed, but '''Down''' || Wrong port or address, or another app (your phone) is connected to the radio.
|-
| ''unsupported command'' in the log || The radio's firmware is older than v1.17. Update the companion firmware.
|-
| Up, but <code>rnpath</code> never finds anything || Wrong channel secret, wrong radio settings, or no path to The Pole. Check the secret against [[#Tunnel details|Tunnel details]] first, then the radio settings, then ask in [[The chat room|the chat room]] whether anyone can hear you.
|-
| Your Public channel disappeared || <code>channel_idx</code> was 0. Pick a spare slot, then add the Public channel back in the MeshCore app.
|-
| Meshtastic: Up, but nothing arrives || <code>channel_index</code> doesn't match the slot the <code>RNS</code> channel is in, or the node isn't on EU_868 LongFast.
|}

== See also ==

* [https://github.com/ScotMesh/RNS_Over_Meshcore ScotMesh/RNS_Over_Meshcore] and [https://github.com/ScotMesh/RNS_Over_Meshtastic ScotMesh/RNS_Over_Meshtastic] — the interfaces' code
* [[RNode]] — the faster radio route
* [[Services and addresses]]

[[Category:Getting Started]]

Reticulum over MeshCore and Meshtastic - Revision history

ScotMesh: New page: reaching Reticulum through a MeshCore or Meshtastic radio via the gateway at The Pole