There are two ways to combine OpenTrafficMap with Home Assistant:

The node publishes its telemetry to the MQTT broker. Home Assistant can read it via the MQTT integration; from there you can build sensors, automations, and dashboards. The credentials for subscribing to your own node are shown in the self-service portal — see Node Registration.

hn/esphome-its-g5 is an ESPHome external component that turns an ESP32-C5 into an ITS-G5 receiver:

• receives raw 802.11p frames on a configurable channel (5860–5900 MHz, e.g. 5900 MHz / G5CC)
• an on_packet trigger gives you the frame bytes, signal strength (RSSI), channel, and reception rate for your own automations
• optional sensors expose packets_received and packets_dropped counters
• the example configuration its-g5-opentrafficmap.yaml forwards all frames to the OpenTrafficMap MQTT server — set the node_id substitution to your Ethernet MAC address or your assigned friendly name

For OpenTrafficMap integration an Ethernet chip (e.g. KSZ8851SNL, W5500, ENC28J60) is used alongside the ESP32-C5.