feat(go): publish realtime fields stream

go/vehicle-gateway/internal/envelope/realtime.go

@@ -0,0 +1,51 @@
+package envelope
+
+import "strings"
+
+func IsRealtimeTelemetryFrame(env FrameEnvelope) bool {
+	if env.ParseStatus == ParseBadFrame {
+		return false
+	}
+	switch env.Protocol {
+	case ProtocolGB32960:
+		command := strings.TrimSpace(env.MessageID)
+		if command == "" && env.Parsed != nil {
+			if header, ok := env.Parsed["header"].(map[string]any); ok {
+				command = strings.TrimSpace(stringAny(header["command"]))
+			}
+		}
+		if strings.EqualFold(command, "0x02") || strings.EqualFold(command, "0x03") {
+			return true
+		}
+		_, hasDataUnits := env.Parsed["data_units"]
+		return hasDataUnits || hasRealtimeField(env)
+	case ProtocolJT808:
+		if strings.EqualFold(strings.TrimSpace(env.MessageID), "0x0200") {
+			return true
+		}
+		if _, ok := env.Parsed["location"]; ok {
+			return true
+		}
+		return hasRealtimeField(env)
+	case ProtocolYutongMQTT:
+		data, ok := env.Parsed["data"].(map[string]any)
+		return ok && len(data) > 0
+	default:
+		return false
+	}
+}
+
+func hasRealtimeField(env FrameEnvelope) bool {
+	return env.Fields[FieldLatitude] != nil ||
+		env.Fields[FieldLongitude] != nil ||
+		env.Fields[FieldTotalMileageKM] != nil ||
+		env.Fields[FieldSpeedKMH] != nil ||
+		env.Fields[FieldSOCPercent] != nil
+}
+
+func stringAny(value any) string {
+	if text, ok := value.(string); ok {
+		return text
+	}
+	return ""
+}