feat: add yutong mqtt ingestion

go/vehicle-gateway/internal/gateway/mqtt_client_test.go

@@ -0,0 +1,61 @@
+package gateway
+
+import (
+	"context"
+	"log/slog"
+	"testing"
+
+	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/envelope"
+)
+
+func TestMQTTClientHandleMessagePublishesRawAndUnified(t *testing.T) {
+	sink := &recordingSink{}
+	client, err := NewMQTTClient(MQTTClientConfig{
+		EndpointName: "endpoint-a",
+		Broker:       "tcp://127.0.0.1:1883",
+		ClientID:     "test-client",
+		Topics:       []string{"/ytforward/shln/+"},
+		Sink:         sink,
+		Logger:       slog.New(slog.NewTextHandler(testWriter{t: t}, nil)),
+	})
+	if err != nil {
+		t.Fatalf("NewMQTTClient() error = %v", err)
+	}
+
+	client.handleMessage(context.Background(), "/ytforward/shln/dev1", []byte(`{
+	  "device":"LTEST000000000001",
+	  "time":"20260413100000",
+	  "data":{"METER_SPEED":52.3,"TOTAL_MILEAGE":123456.7}
+	}`))
+
+	if len(sink.raw) != 1 || len(sink.unified) != 1 {
+		t.Fatalf("raw=%d unified=%d", len(sink.raw), len(sink.unified))
+	}
+	if sink.raw[0].Protocol != envelope.ProtocolYutongMQTT || sink.raw[0].VIN != "LTEST000000000001" {
+		t.Fatalf("unexpected raw envelope: %#v", sink.raw[0])
+	}
+}
+
+func TestMQTTClientHandleBadPayloadPublishesOnlyRaw(t *testing.T) {
+	sink := &recordingSink{}
+	client, err := NewMQTTClient(MQTTClientConfig{
+		EndpointName: "endpoint-a",
+		Broker:       "tcp://127.0.0.1:1883",
+		ClientID:     "test-client",
+		Topics:       []string{"/ytforward/shln/+"},
+		Sink:         sink,
+		Logger:       slog.New(slog.NewTextHandler(testWriter{t: t}, nil)),
+	})
+	if err != nil {
+		t.Fatalf("NewMQTTClient() error = %v", err)
+	}
+
+	client.handleMessage(context.Background(), "/ytforward/shln/bad", []byte("{bad-json"))
+
+	if len(sink.raw) != 1 || len(sink.unified) != 0 {
+		t.Fatalf("raw=%d unified=%d", len(sink.raw), len(sink.unified))
+	}
+	if sink.raw[0].ParseStatus != envelope.ParseBadFrame {
+		t.Fatalf("parse status = %q", sink.raw[0].ParseStatus)
+	}
+}