node-tools/internal/launch/launch.go

@@ -231,12 +231,14 @@ func Start(module, entry string, env []string, mesh Bus, logf func(string, ...an
 								result = answered
 							}
 						case "mesh/state.watch":
-							// Each change is asked of this child, in order; the watch is answered once the
-							// current values have been handed over, so a bundle that awaits it has the whole
-							// of the state before it goes on (ADR 0201).
+							// Each change is asked of this child, in order, naming the watch it is for by
+							// the id the child asked it with — two watches of one state are two handlers;
+							// the watch is answered once the current values have been handed over, so a
+							// bundle that awaits it has the whole of the state before it goes on (ADR 0201).
 							var stop func()
+							watch := m.ID
 							stop, err = mesh.Watch(m.Params, func(change json.RawMessage) error {
-								_, err := c.ask(module, "mesh/state", map[string]any{"change": change}, EventTimeout)
+								_, err := c.ask(module, "mesh/state", map[string]any{"watch": watch, "change": change}, EventTimeout)
 								return err
 							})
 							if err == nil {