xterra-overland-dashboard/docs/communications.md

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