[jooray]

Requests GroupData data-type 0x0150 for Road Events.

Road Events are signed road reports (police, accidents, closures, hazards…) and votes on them, defined as Nostr kinds 1315/1316. On a MeshCore radio, each event travels as one PAYLOAD_TYPE_GRP_DATA datagram on the public hashtag channel #roadstr. The frame is 117–163 bytes for a report and 134 for a vote, and it carries the author's key and Schnorr signature. Any receiver can verify it and rebuild the original event byte for byte, so a node with internet can pass it on to Nostr relays, and back, without being trusted.

Two independent, interoperable apps already send and receive it:

• Roadstr, a navigation app for Android: https://github.com/roadstrapp/roadstr-app
• Roadbeacon, an OsmAnd plugin and a web client: https://github.com/jooray/roadbeacon

Both run the same conformance vectors. On the phone they reach the radio through MeshCore Open's local API (proposed in zjs81/meshcore-open#616), so road events and chat share one companion connection. Both currently use the dev value 0xFF52. They are already listening on 0x0150 and will switch sending to it once this is merged.

• Format specification: https://github.com/jooray/roadbeacon/blob/main/nips/road-events.md
• MeshCore transport, channel and bridging rules: https://github.com/jooray/roadbeacon/blob/main/docs/meshcore.md

The change adds one row to docs/number_allocations.md.