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# Two receive-only V4s feeding one transmit-only V4

Use the exact board's updated **Full Repeater** image on all three V4s. The
left V4 receives MediaMesh, the right V4 receives USA, and both feed the center
over ESP-NOW or WiFi UDP:

```text
MediaMesh 911.150 --> left V4  (LoRa RX only) --+
                                              +--> center V4 (LoRa TX only)
USA 910.525      --> right V4 (LoRa RX only) --+       radio:  USA 910.525
                                                     radio2: MediaMesh 911.150
```

The center routes by each bridge sender's identity. It never needs to infer
the source frequency from encrypted packet contents. Its single LoRa chip
transmits the two profiles sequentially; they cannot transmit simultaneously.

Configure over USB or a direct WiFi CLI. `radio.mode rx` also prevents LoRa
admin replies, and `tx` prevents receiving LoRa commands. These modes apply to
both LoRa profiles and persist across reboot. They leave the 2.4 GHz bridge
able to transmit and receive. TX-only requires a clear-channel CAD check on
the selected LoRa profile before forwarding a packet. If busy, the center keeps
backing off; it does not bypass CAD after a timeout. A clear check cannot
guarantee collision-free delivery. The center does not accept LoRa packets.

## ESP-NOW setup

On **all three V4s**, prepare the same bridge group. Replace `YourSharedKey`
with the same 1–15 character secret, and use one common 2.4 GHz channel:

```text
set espnow.enabled off
set bridge.channel 6
set bridge.format wrapped
set bridge.secret YourSharedKey
set bridge.source rx
set bridge.delay 500
clear bridge.routes
set bridge.ingress off
```

`clear bridge.routes` replaces any existing source mappings. With ingress
`off`, a sender without an explicit rule cannot enter the local LoRa mesh.
Using source `rx` on the center also prevents its LoRa transmissions being
exported back to the receivers.

On the **left V4**:

```text
set radio.mode rx
set radio 911.150,250,7,5
set radio2 off
set radio2.cross off
set repeat off
set espnow.enabled on
get espnow.stats mac
```

On the **right V4**:

```text
set radio.mode rx
set radio 910.525,62.5,7,5
set radio2 off
set radio2.cross off
set repeat off
set espnow.enabled on
get espnow.stats mac
```

Record each returned `mac:AA:BB:CC:DD:EE:FF` value. This is the WiFi station
MAC used by ESP-NOW, not the node's MeshCore public key or Bluetooth address.

On the **center V4**, substitute those actual MAC addresses:

```text
set radio.mode tx
set radio 910.525,62.5,7,5
set radio2 mediamesh
set radio2.cross off
set bridge.route.1 mac:AA:BB:CC:DD:EE:10 radio2
set bridge.route.2 mac:AA:BB:CC:DD:EE:20 radio
set repeat on
set espnow.enabled on
```

The first example MAC represents the left V4; the second represents the right.
Forwarded left traffic stays on MediaMesh, and forwarded right traffic on USA.
If a selected profile is unavailable, incoming packets are dropped rather
than moved to the other channel. Normal duplicate, scope, filter and airtime
checks still apply. The `mediamesh` preset also enables the normal MediaMesh
forwarding region. The center's own adverts and replies retain their existing
routing policies, including `tx.reply`; source rules select forwarded traffic.

## WiFi UDP alternative

Keep the LoRa settings and direction modes above. Disable ESP-NOW on all
three, connect them to an existing WiFi network using the [WiFi settings](WiFi.md),
and reserve their DHCP addresses. These examples use left `192.168.1.50`,
right `192.168.1.51`, center `192.168.1.52`, all on UDP port `4404`.
Keep the same `bridge.secret` on all three.

On **each receiver**, configure the center as its only UDP destination:

```text
set espnow.enabled off
set udp.enabled off
set udp.port 4404
set udp.peer.1 192.168.1.52:4404
set udp.enabled on
get udp.status
```

Remove any other saved `udp.peer.2` through `.8` destinations if present. On
the **center**, replace the MAC rules with endpoint rules and allow both peers:

```text
set espnow.enabled off
set udp.enabled off
set udp.port 4404
set udp.peer.1 192.168.1.50:4404
set udp.peer.2 192.168.1.51:4404
clear bridge.routes
set bridge.ingress off
set bridge.route.1 udp:192.168.1.50:4404 radio2
set bridge.route.2 udp:192.168.1.51:4404 radio
set udp.enabled on
get udp.status
```

The route matches the sender's IP address **and UDP listening port**. Both
ends must allow each other's endpoint for the authenticated bridge session.
See [UDP bridge setup](udp_bridge_setup.md) for station readiness, router
isolation and transport probes.

## Check the result

On each receiver, `get radio.mode` should report `rx`. On the center:

```text
get radio.mode
get cad
get radio
get radio2
get bridge.ingress
get bridge.route.1
get bridge.route.2
get radio2.status
```

Expect center mode `tx`, effective CAD on, default ingress `off`, the left rule targeting
`radio2`, and the right rule targeting `radio`. Send a packet on each LoRa
network and check receipt on that same network beyond the center. Bridge
counters show transport activity but do not by themselves prove LoRa delivery.

To return a V4 to normal LoRa operation, use `set radio.mode both`. Existing
installations default to `both`, with no source routes and primary-radio
bridge ingress. Existing bridge wire formats are unchanged. Strict direction
modes require updated firmware on each configured V4; old bridge senders can
still feed an updated center using the source mappings.