Archy set no radio params on Meshcore devices — SF/CR/BW/freq lived only in
device firmware, so a radio on the wrong preset could not be fixed from the
node (it hears RF energy but demodulates nothing; the fleet hit exactly this
on an RNode: docs/RETICULUM-TRANSPORT-PROGRESS.md item 4).
- protocol.rs: build_set_radio_params — wire format verified against the
MeshCore companion firmware handler (CMD_SET_RADIO_PARAMS=11:
[11][freq:u32 LE MHz*1000][bw:u32 LE kHz*1000][sf][cr]); byte-layout test
pinned to the Portugal preset 869.618 MHz / 62.5 kHz / SF8 / CR8.
- serial.rs: MeshcoreDevice::set_radio_params (device reboots on OK).
- MeshConfig.lora_radio_params: Option — None (default) leaves the radio
untouched, so only explicitly-configured deployments are affected.
- session.rs: provision on connect, gated on a persisted last-applied marker
(SELF_INFO offsets shift across firmware versions) + the same attempt cap
as region/channel so a refusing radio never reboot-loops.
- mesh.configure RPC: lora_radio_params arm with firmware-range validation.
mesh tests: 114/114 pass.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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