[ 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.
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: a mobile mesh is low, moving, and blocked — by your body,
the vehicle, the terrain — so range is short and 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 —
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 — you see where everyone is on the
map. Set a sane position interval (smart-position, or every few minutes —
not every few seconds; it 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 — 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 — that 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 — 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, keep
it off public MQTT — and remember the radio still gives you away, since
encryption protects content, not the fact or direction of a transmission. Plan
for a lost device: 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.