IdleState now extracts parent paths from Inform parameters for GPN test. This classifies Inform params (writable vs read-only) and tests GPN support in one step. Falls back to data model root path if no Inform params available. All 791 tests pass. Build status: Success

app/services/cwmp/main_state_machine.ts

@@ -59,7 +59,26 @@ class IdleState extends DeviceState {
       '[IdleState] GPN allowed — proceeding to discovery'
     )
 
-    // Test GPN support using a single known path from the device's data model
+    // Extract unique parent paths from the Inform parameters to test GPN support
+    // and classify them (writable vs read-only). If GPN fails, the catalog will classify instead.
+    const allKnown = [...device.getParameters(), ...device.getProperties()]
+    const parentPaths = new Set<string>()
+    for (const p of allKnown) {
+      if (!p?.name || typeof p.name !== 'string') continue
+      const lastDot = p.name.lastIndexOf('.')
+      if (lastDot > 0) {
+        parentPaths.add(p.name.substring(0, lastDot + 1))
+      }
+    }
+
+    // If we have paths from the Inform, use them for GPN test + classification
+    if (parentPaths.size > 0) {
+      const paths = Array.from(parentPaths).sort()
+      logger.info({ paths, deviceId: device.identifier }, '[IdleState] GPN test on Inform parameter paths')
+      return { nextState: new DiscoveringParametersState(paths), response: '' }
+    }
+
+    // Fallback: use known data model root path
     const dataModel = device.dataModel
     if (dataModel === 'tr-181') {
       return { nextState: new DiscoveringParametersState(['Device.ManagementServer.']), response: '' }