New REST endpoint on FW HTTP server (port 8032) writes
csi_cfg/target_ip + target_port to NVS and reboots. Body is
plain text "IPv4:PORT" (e.g. 192.168.0.103:5005). Verified on
both 192.168.0.100 and 192.168.0.101 — sensors silent after
Mac IP move came back online in ~3 min instead of needing USB.
Same PSK auth as /ota/recalibrate (ADR-050). Strict body parser
rejects malformed input before touching NVS. Binary size +1 KB.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>