[ Mobile Meshtastic Network ]

The other guides here are about fixed nodes: high relays, solar, planning a
permanent footprint. This one is the opposite, a mesh that moves with you.
Think a hiking party, an overlanding convoy, a festival crew, a comms-down group.
A handful of people who want to stay in text contact off-grid with no
infrastructure to lean on.

The mindset flip is that a mobile mesh is low, moving, and blocked, by your
body, the vehicle, the terrain. Range is short and it changes minute to minute.
You're not planning a coverage map, you're keeping a moving group connected. Two
ideas run through everything below: keep the nodes small and battery-friendly,
and when the group spreads out, lean on one trick, a temporary high relay.

For mobile you want small, battery-powered, and ideally GPS. Any board from
the build guide's board table works; the mobile-friendly picks:

  — T-Beam: ESP32 + GPS + an 18650 holder. The classic vehicle /
    mobile node.
  — T-Echo: nRF52 + GPS + e-paper, pocket-size and sips power. A
    great backcountry node.
  — Wio Tracker L1: nRF52 + GPS tracker dev board, low-power.
  — T-Deck: ESP32 + keyboard + screen; a standalone handheld you
    type on without a phone.

Most people just run a small node paired to the phone app over Bluetooth, so
the phone is the screen and keyboard. A T-Deck or T-Echo lets you leave the phone
in your pocket and read off the device itself.

On the move, almost every node is CLIENT (or CLIENT_MUTE for a phone-tethered
leaf that shouldn't rebroadcast). The one hard rule: a mobile node is never a
ROUTER. A router that moves drifts out of any useful position and just floods
airtime from wherever it happens to be. If you want a node to show on the map
without a full client, the TRACKER role beacons position and little else.
(Full role rundown in the build guide.)

No solar here, you're moving. Three easy options:

  — USB power bank: the simplest. A node sips milliamps, so a small
    bank runs it for days.
  — Vehicle 12 V → USB: a cheap car adapter; wire it to switched
    power so it doesn't flatten the battery overnight.
  — On-board 18650 / LiPo: a T-Beam's holder, or a LiPo on an nRF52
    board.

nRF52 nodes (T-Echo, RAK) last far longer between charges than ESP32. Charge
everything the night before. A dead node mid-trip is the whole point gone.

GPS is what makes a mobile mesh worth running, since you can see where everyone
is on the map. Set a sane position interval: smart-position, or every few
minutes. Not every few seconds, which burns airtime and battery for no real gain.

Mind the privacy trade: position is broadcast on the channel, so on the
public default channel that's your live location in the open. Use a
private group channel and, if it matters, dial back the position precision.
(More in the build guide's channels & security section.)

Mobile means low and blocked, so placement matters even more than usual:

  — Handheld: the stock whip works, but your body blocks the signal.
    Hold it up and out; a slightly longer whip helps.
  — Vehicle: a mag-mount whip on the metal roof gives a ground
    plane and gets the antenna above the cabin. Far better than a node tossed on
    the dash, where the metal cabin shields it.
  — Don't bury it: a node stuffed in a pack against your back, or in a
    metal glovebox, barely gets a signal out.

Connector types and antenna choices are covered in the
build guide.

The one move that rescues a spread-out group: drop a temporary high relay.
Low, moving nodes lose each other fast once a party splits across trails or a
convoy stretches over a few miles. A spare node parked up high (a hilltop, a
roof, a window facing the area, even left in a car on a ridge) bridges the group
across terrain that node-to-node can't.

It's the mobile version of the fixed relay: one well-placed node carries the
whole group. If you know the area in advance, pick its spot with the
coverage-planning guide.

For a group, make a private channel: a custom name plus a random PSK, shared
via the channel QR code. Two reasons: it keeps your chatter off the busy
public default, and only people with the key can read it.

The critical bit: pre-share the QR before you leave coverage. Out in the
field you can't easily hand keys around; everyone needs to scan it while you're
still together with cell or wifi. (The default channel is public; see
channels & security for why.)

A mobile mesh has threats a fixed one doesn't, mostly because it moves with
you. The full model is in the build guide's channels & security section;
the mobile-specific parts:

  — A moving node is a moving beacon. You broadcast your live GPS, and a
    node can be RF direction-found as you travel, which reveals a track,
    not just a point. Encryption hides the message, not that you're transmitting
    from here, then here, then here.
  — Lost or seized hardware = a compromised group. A dropped, stolen, or
    confiscated phone or node hands over the shared channel key and its location
    history, and that's far likelier on the move than for a node bolted to a roof.
  — Keep mobile traffic off public MQTT. Bridge a moving group to a public
    broker and you've published everyone's movements. Stay RF-only, or use a
    private broker, for anything you wouldn't post in the open.

If not being tracked is the actual goal
(protests, sensitive routes, comms-down): run a private channel, turn position
precision down or off, and keep it off public MQTT. Remember the radio still
gives you away regardless, since encryption protects content, not the fact or
direction of a transmission. Plan for a lost device too: if one goes missing,
rotate the channel key.

Before you rely on it:

  — Same settings everywhere: region, modem preset, and channel (plus
    the shared private key) match on every node.
  — GPS has a lock: a cold start can take minutes, so power it up
    before you leave.
  — Everything charged: nodes and power banks topped off.
  — Antennas on: never key up bare.
  — Range-test it: spread a few hundred metres apart and confirm you
    still hear each other; you'll learn the real range for your gear and terrain.
  — Agree the relay plan: if the group will spread out, decide who
    carries the high relay and where it goes.

Good for backcountry hiking, overlanding and convoys, festivals and events, and
comms-down / emergency group contact.