# Communications

## Architecture

Pico Dashboard
↓
RS-485
↓
ESP32 Controller

Backup:
WiFi

## Protocol

Message Types:

- status_request
- status_response
- set_relay
- relay_response
- enable_wifi
- wifi_response
- toggle_ignition
- ignition_response
- toggle_sensor_fault
- sensor_fault_response

## Failure Handling

If RS-485 is lost:
- Dashboard displays warning
- Last known values remain visible
- Relay commands fail safely

## Future Features

- MQTT
- Home Assistant
- OTA Updates
- Remote Diagnostics