diff --git a/ROADMAP.md b/ROADMAP.md
index 984cd55..5e0b06d 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -93,6 +93,14 @@ external interfaces. See `docs/architecture/structure.canvas` → *Backend – M
       does as well. Exercised against the real unit — fan speed, mode, setpoint
       to the half degree, power off and back on — each checked against the
       unit's own answer, and it was left as it was found
+- [x] The aircon reaches both firmware generations: adapters shipped from 2025
+      report `firmType` `WF-RAC-HTTPS` and wrap port 51443 in TLS with a
+      self-signed certificate naming their MAC, where older ones answer plain
+      HTTP there and drop the handshake. Nothing announces which before the
+      first exchange, so the node tries TLS, falls back, and remembers — a unit
+      that gets updated costs one retry rather than a reconfiguration. The
+      payload is identical across both, so only the transport moved. Verified
+      against one unit of each generation, read and command
 - [x] Node lifecycle as a protocol (`start`/`stop`/`report_health` on `Node`),
       replacing the controller's per-type isinstance chains — the same hooks a
       connector implements, validated on the built-in nodes first