feat(device-plane): add typed B2 service ping transport

device-plane/services/device-gateway/test/discovery-integration.test.mjs

@@ -44,12 +44,14 @@ test("B2 HEADER2 becomes a persisted masked quarantine discovery before ACK", as
       acceptAdapterMessage: async (value) => {
         storedMessage = value;
         return {
-          schemaVersion: "nodedc.device-adapter-acceptance.v1",
-          acceptanceRef: "acceptance:integration-001",
-          idempotencyKey: value.safeView.idempotencyKey,
-          status: "accepted",
-          replayed: false,
-          acceptedAt: "2026-08-11T12:00:00.000Z",
+          acceptance: {
+            schemaVersion: "nodedc.device-adapter-acceptance.v1",
+            acceptanceRef: "acceptance:integration-001",
+            idempotencyKey: value.safeView.idempotencyKey,
+            status: "accepted",
+            replayed: false,
+            acceptedAt: "2026-08-11T12:00:00.000Z",
+          },
         };
       },
     },
@@ -73,6 +75,7 @@ test("B2 HEADER2 becomes a persisted masked quarantine discovery before ACK", as
     now: () => new Date(0x52db95de * 1000),
     onDiscovery: observe.observeDiscovery,
     onMessage: observe.acceptMessage,
+    onCommandStatus: async () => undefined,
   });
   const addresses = await gateway.start();
   try {
@@ -115,6 +118,7 @@ function listen(server) {
 function close(server) {
   return new Promise((resolve, reject) => {
     server.close((error) => (error ? reject(error) : resolve()));
+    server.closeAllConnections?.();
   });
 }
 
@@ -134,5 +138,12 @@ function exchange(port, payload, expectedBytes) {
       }
     });
     socket.on("error", reject);
+    socket.on("close", () => {
+      if (byteLength < expectedBytes) {
+        reject(new Error(
+          `device_gateway_test_socket_closed_early:${byteLength}/${expectedBytes}`,
+        ));
+      }
+    });
   });
 }