flatbuffer base

flatbuffers/control/qos.fbs

@@ -0,0 +1,10 @@
+namespace hmmmm.ctrl.qos;
+
+// Server → Client: connection quality snapshot.
+// Sent periodically or on request (TBD).
+table QosReport {
+    rtt_us:          uint64;   // measured round-trip time, microseconds
+    packets_sent:    uint64;
+    packets_lost:    uint32;
+    buf_pressure:    float;    // outgoing buffer fill level, 0.0 .. 1.0
+}