Room servers forward messages with the original author's 4-byte public
key prefix (roomPostAuthorPrefix). Was ignoring this — all room messages
showed the room server's name as sender.
Now resolves the actual poster's name from roomPostAuthorPrefix by
matching against the contacts list. Falls back to room server name if
the author isn't a known contact.
Also fixes findContactByPrefix to accept 4-byte prefixes (was rejecting
anything shorter than 6 bytes).
Fixes#22
When firmware sends telemetry via both pushTelemetryResponse (0x8B)
and pushBinaryResponse (0x8C), the same LPP data was parsed and
applied twice, causing duplicate sensor entries.
Added hash-based dedup: same payload for same contact within 2s is
skipped. Also added minimum length check for binary responses.
When a contact has no GPS, estimate their position from RSSI
observations through multiple repeaters:
- 1 repeater: offset by RSSI distance in deterministic direction
- 2 repeaters: weighted midpoint between circle intersections
- 3+ repeaters: weighted centroid with inverse-square weighting
(closer repeater observations dominate)
Observations stored per-repeater (latest wins), max 8 per contact,
expire after 30 minutes. Each incoming message updates the estimate.
For contacts without GPS, estimate their position by:
1. Finding the first-hop repeater from their routing path
2. Estimating distance from RSSI using log-distance path loss model
3. Placing them at a deterministic offset from the repeater
Uses LoRa outdoor path loss exponent (n=3.0) with reference RSSI
-30dBm at 1m. Distance clamped to 10m-50km range. Bearing derived
from contact public key hash for stable positioning.
- Contact.isFavourite reads bit 0 of firmware flags field
- Toggle favourite via contact action sheet (writes to device)
- Favourites section shown first in contacts tab
- Path size options corrected to [1, 2, 3] bytes
