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Introduction
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WiFi and MQTT by Firmware Type
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SX1262 channel-scanning hardware results
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Carrier-wave RF checks
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CW and CW2 validation
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CW and CW2 validation
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Software checks
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Reproduction
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CLI Availability by Firmware Build
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CLI Command Availability Matrix
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CLI Commands
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CLI setting dispatch audit
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Full Companion contact caches
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Contact-cache and NimBLE RAM qualification
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Companion Offline Message Queue
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Companion Protocol
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Full Companion
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USB Companion ASCII default validation
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USB Companion client compatibility
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Local Documentation
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Double center-frequency write: V4 transmitter / XIAO receiver
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Classic ESP32 image memory budget
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ESP-NOW bridge: simple setup
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Frequently Asked Questions
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Filter policy playground
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Firmware memory checks
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Firmware picker
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Flood Filtering and Moderation
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Four fixed transmitters: longer dwell repeats
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Four fixed transmitters / fast single-pass receiver
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<span class="md-ellipsis">
Full Companion: turn features on and off
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<span class="md-ellipsis">
Companion USB CLI and binary switcher
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Full USB logging repair — 1.17.1.6
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GPS Tracking
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<a href="../halo_keymind_settings/" class="md-nav__link">
<span class="md-ellipsis">
Halo and Keymind Branch Settings
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<a href="../hardware_validation_bluetooth_stealth_2026-09-07/" class="md-nav__link">
<span class="md-ellipsis">
XIAO Bluetooth stealth hardware validation - 2026-09-07
</span>
</a>
</li>
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<a href="../hardware_validation_checklist/" class="md-nav__link">
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Hardware validation checklist
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Home-screen text spacing
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<a href="../host_cli_service/" class="md-nav__link">
<span class="md-ellipsis">
LoRa CLI Host Service
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<a href="../kiss_modem_protocol/" class="md-nav__link">
<span class="md-ellipsis">
MeshCore KISS Modem Protocol
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</li>
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<a href="../lora_ota_automation/" class="md-nav__link">
<span class="md-ellipsis">
Scripted LoRa OTA from start to finish
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../mbedtls-tls-footprint/" class="md-nav__link">
<span class="md-ellipsis">
Shrinking the per-connection TLS footprint on non-PSRAM observers
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../mixed_scan_validation/" class="md-nav__link">
<span class="md-ellipsis">
Mixed-bandwidth two-channel reception test
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</a>
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<a href="../mixed_sf_bw_validation/" class="md-nav__link">
<span class="md-ellipsis">
Equal-symbol-time mixed SF/BW, four-channel test
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</a>
</li>
<li class="md-nav__item">
<a href="../nimble_companion_trial/" class="md-nav__link">
<span class="md-ellipsis">
ESP32-S3 NimBLE Full Companion trial
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nimble_companion_trial_results/" class="md-nav__link">
<span class="md-ellipsis">
ESP32-S3 NimBLE trial results, 2026-09-08
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nrf52-usb-ready-fix/" class="md-nav__link">
<span class="md-ellipsis">
nRF52 USB READY hang
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</a>
</li>
<li class="md-nav__item">
<a href="../nrf52_companion_storage_recovery/" class="md-nav__link">
<span class="md-ellipsis">
nRF52 Companion automatic ExtraFS recovery
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</a>
</li>
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<a href="../nrf52_power_management/" class="md-nav__link">
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nRF52 Power Management
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<a href="../number_allocations/" class="md-nav__link">
<span class="md-ellipsis">
Number Allocations
</span>
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</li>
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<a href="../ota_easy/" class="md-nav__link">
<span class="md-ellipsis">
Easy firmware updates over LoRa
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</a>
</li>
<li class="md-nav__item">
<a href="../ota_meshtower_v2_sdcard/" class="md-nav__link">
<span class="md-ellipsis">
MeshTower V2 microSD LoRa OTA
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../ota_nrf52_bootloader_update/" class="md-nav__link">
<span class="md-ellipsis">
nRF52 bootloader updates over LoRa
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../ota_nrf52_qspi/" class="md-nav__link">
<span class="md-ellipsis">
nRF52 repeater LoRa OTA with external QSPI
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../ota_protocol/" class="md-nav__link">
<span class="md-ellipsis">
MeshCore OTA - .mota container &amp; LoRa protocol
</span>
</a>
</li>
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<a href="../ota_user_guide/" class="md-nav__link">
<span class="md-ellipsis">
Updating your node over the air (OTA) - user guide
</span>
</a>
</li>
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<a href="../packet_format/" class="md-nav__link">
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Packet Format
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</a>
</li>
<li class="md-nav__item">
<a href="../pair_4p6_300us_validation/" class="md-nav__link">
<span class="md-ellipsis">
SF7/62.5 + SF8/500: 4.6 slow chirps, 0.3 ms reserve
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../pair_preamble32_validation/" class="md-nav__link">
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SF7/62.5 + SF8/500, fast switching and preamble 32
</span>
</a>
</li>
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Payload Format
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<h1 id="cw-and-cw2-validation">CW and CW2 validation</h1>
<p>Tested on the MercerWoodMesh lab Pi on September 14, 2026 (Pacific), using
base commit <code>9241ccc253ad2f8ac2c9a2fe756f59ba2f52505d</code> plus the CW changes.
Test images are marked <code>v1.17.1.6-cw-test-9241ccc2</code>; they are development images.</p>
<p>A separate RAK4631 sampled instantaneous RSSI every approximately 10 ms.
The transmitting boards ran the Full V4 repeater and Full T1000-E Companion
builds. Both were configured for −9 dBm chip TX power, with profiles at
909.5 and 919.5 MHz, BW125, SF7, CR5, and 32-symbol preambles.</p>
<table>
<thead>
<tr>
<th>Check</th>
<th>V4 / SX1262</th>
<th>T1000-E / LR1110</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>cw on 0.25</code> measured duration</td>
<td>0.25 s</td>
<td>0.25 s</td>
</tr>
<tr>
<td><code>cw on 1.25</code> measured duration</td>
<td>1.25 s</td>
<td>1.25 s</td>
</tr>
<tr>
<td>Manual stop approximately 1 s into a 5 s request</td>
<td>1.01 s</td>
<td>1.01 s</td>
</tr>
<tr>
<td><code>cw on 1.25</code> after enabling RXPS</td>
<td>1.26 s</td>
<td>1.25 s</td>
</tr>
<tr>
<td><code>cw2 on 1.25</code> on the second frequency</td>
<td>1.25 s</td>
<td>1.25 s</td>
</tr>
<tr>
<td>Primary-frequency RSSI change while CW2 transmits</td>
<td>0 dB</td>
<td>0 dB</td>
</tr>
<tr>
<td>Paired RX and TX recovery checks</td>
<td>5/5 passed</td>
<td>5/5 passed</td>
</tr>
</tbody>
</table>
<p>The observer saw roughly −56 to −57 dBm during V4 carriers and −67 to
−71 dBm during T1000-E carriers, against a −112 to −113 dBm baseline.
Readings returned to baseline after timeout and manual stop. These are
received signal readings, <strong>not calibrated transmitter output measurements</strong>.</p>
<p>RX recovery used CRC-valid LoRa test payloads and the DUT's receive counter.
TX recovery used each DUT's MeshCore advertisement, received with valid CRC
by the observer. Both DUTs finished in RX, with CW and radio2 disabled and
no outbound packet pending. The observer has no autonomous transmission.</p>
<h2 id="software-checks">Software checks</h2>
<ul>
<li>1,436 native tests passed, including new checks that CW holds queued packets,
services its deadline, and prevents transmission in the same loop where a
received command starts CW.</li>
<li>Compiled production-method tests cover fractional input, malformed durations,
bounds, timer rollover, busy/IRQ rejection, RXPS cleanup, board TX/RX callbacks,
profile selection and replacement, failed TX entry, stop retries, and failed
RX restart. An ESP32 sleep test covers a carrier with USB disconnected.</li>
<li>Full V4 repeater, Full T1000-E Companion, and ordinary STM32
<code>RAK_3x72_companion_radio_usb</code> builds passed. The STM32 build is a compilation
check, not an RF test of that board.</li>
<li>An additional existing OTA sleep test still expects the old
<code>ota::ota_ctx().apply_pending</code> spelling. It fails against unchanged HEAD
<code>src/Mesh.cpp</code> and test-file contents; the actual implementation uses
<code>ota_context_if_active()</code>. This is separate from the CW changes.</li>
</ul>
<h2 id="sx1276-follow-up">SX1276 follow-up</h2>
<p>The SX1276 carrier feature from <a href="https://github.com/mikecarper/MeshCore/pull/11">PR #11</a>
is included alongside SX1262 and LR1110 support. It switches to FSK with zero
deviation, applies the board's calibrated TX power, and rebuilds the runtime
LoRa configuration when stopped. External-PA settings pass through the same
DAC/drive-power mapping used for packets, including RFO selection.</p>
<p>The normal TX power command can adjust a running carrier for meter sweeps.
RadioLib's SX1276 power setter enters standby, so the carrier is restarted
afterward without extending the deadline. Failed power changes stop the
carrier and restore the previous cached power.</p>
<p>Follow-up checks use base <code>9dd9881d520b4b791600a00fff1f8e1436921054</code> plus the
SX1276 changes. Production-method regression tests cover both profiles,
zero deviation, external-PA calibration, RFO, power sweeps, timeout, failed
FSK entry, failed restoration, retry guards, and return to LoRa. The native
CW paths and existing radio/profile/sleep/PA checks pass as well.
Both <code>GEPRC_Linkflow_900_repeater</code> (external PA) and
<code>Heltec_v2_companion_radio_usb</code> firmware builds pass, including size checks.</p>
<p>SX1276 RF output has not been measured in this follow-up. The physical RF
results above apply to SX1262 and LR1110.</p>
<h2 id="bench-qualifications">Bench qualifications</h2>
<p>The first CW2 request arrived before radio2's existing delayed activation.
The harness now polls <code>get radio2.status</code> for the active mode before testing.</p>
<p>An initial V4 dual-profile packet probe used a 120-symbol preamble against
32-symbol profiles. A comparison around another CW2 burst received <strong>0/8
before and 1/8 afterward</strong> with that mismatched probe, versus <strong>8/8 before
and 8/8 afterward</strong> with a matching 32-symbol probe. The configured preamble
also sets the driver's preamble-detection hold timeout, so a much longer
incoming preamble can outlast that hold and be interrupted by scanning.
The final dual-profile recovery checks use matched preambles. This finding
does not establish general packet-loss performance for every scan combination.</p>
<p>These checks establish RF activity, selected-frequency behavior, and recovery
on the tested boards. They do not measure spectral purity, frequency error,
SWR, calibrated power, or months of uptime. Carrier timeouts are serviced by
the main loop and depend on that loop remaining responsive.</p>
<h2 id="reproduction">Reproduction</h2>
<p>Append <code>tools/hil/cw_observer.ini</code> to <code>extra_configs</code> in <code>platformio.local.ini</code>,
preserving existing entries, and build <code>pio run -e cw_observer_rak4631</code>.
Flash that application onto a separate lab RAK4631. Do not run PlatformIO
concurrently with another build or upload in the checkout.</p>
<p>Configure the lab DUT's primary profile as above, disable radio2, set TX power
to −9 dBm, and reboot to apply saved primary settings. Then run:</p>
<pre><code class="language-sh">python3 tools/hil/carrier_wave.py --dut /dev/serial/by-id/DUT \
--observer /dev/serial/by-id/OBSERVER --role repeater --output cw-results.json
</code></pre>
<p>Use <code>--role companion</code> for the T1000-E. The harness changes lab radio2/RXPS
settings and emits short RF bursts and packet probes. It is for test boards.</p>
<p>Compact evidence: <a href="../tools/hil/carrier_wave_results.json">carrier_wave_results.json</a>.
Command guide: <a href="../carrier_wave/">carrier-wave RF checks</a>.</p>
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