rspace-online/backlog/tasks/task-129 - Pico-firmware-—-command-parser-USB-serial.md

id	title	status	assignee	created_date	labels	milestone	dependencies	priority
TASK-129	Pico firmware — command parser + USB serial	Done		2026-03-29 20:51	firmware	m-2		high

Description

Write command_parser.py (JSON line parser, validates & dispatches to servo/LED) and transport_usb.py (non-blocking USB serial listener at 115200 baud).

Acceptance Criteria

• #1 Parses all command types: pan/tilt, led, led_pwm, home, ping
• #2 Returns JSON ack with current position
• #3 Graceful error handling for malformed JSON
• #4 Non-blocking stdin poll with buffer overflow guard

Final Summary

command_parser.py: stateless dispatcher with strict validation, defined processing order. transport_usb.py: select.poll non-blocking with 512-char overflow guard.