DEVLOG #17

I finally verified the complete breadboard mmWave data path with the
HLK-LD2450.

After flashing the known firmware to a new ESP32-C3, it joined csi-test,
received 192.168.4.2, and exposed /ota/status on port 8032. The status
confirmed the expected UART mapping: GPIO20 RX, GPIO21 TX, and 256000 baud in
calibration mode.

The important test was a read-only UDP capture: 224 valid LD2450 datagrams in
20 seconds, followed by 222 more while the setup was powered only from the
normal power supply. Every packet matched ruview.mmwave.ld2450.v1 and
contained a recognized target. This proves that the breadboard wiring, UART
parser, ESP Wi-Fi connection, and UDP transport work together. The reported
coordinates are still sensor-frame data, not a validated room position.

The permanent PCB-02 is still pending. Next I will validate the radar
transform with known room marks, connect the CSI receivers, and continue with
D6 calibration, training, blind tests, and the quality gates.