feat: track jt808 registration identity

go/vehicle-gateway/internal/protocol/jt808/parser.go

@@ -151,6 +151,24 @@ func ParseFrame(raw []byte, receivedAtMS int64, sourceEndpoint string) (envelope
 		if location.TotalMileageKM != nil {
 			fields[envelope.FieldTotalMileageKM] = *location.TotalMileageKM
 		}
+	} else if messageID == 0x0100 {
+		registration, err := parseRegistration(body)
+		if err != nil {
+			return envelope.FrameEnvelope{}, err
+		}
+		parsed["registration"] = registration
+		if deviceID, ok := registration["device_id"].(string); ok {
+			fields["device_id"] = deviceID
+		}
+		if plate, ok := registration["plate"].(string); ok {
+			fields["plate"] = plate
+		}
+	} else if messageID == 0x0102 {
+		authentication := parseAuthentication(body)
+		parsed["authentication"] = authentication
+		if token, ok := authentication["token"].(string); ok {
+			fields["auth_token"] = token
+		}
 	}
 
 	env := envelope.FrameEnvelope{
@@ -166,10 +184,36 @@ func ParseFrame(raw []byte, receivedAtMS int64, sourceEndpoint string) (envelope
 		Fields:         fields,
 		ParseStatus:    envelope.ParseOK,
 	}
+	if registration, ok := parsed["registration"].(map[string]any); ok {
+		env.DeviceID, _ = registration["device_id"].(string)
+		env.Plate, _ = registration["plate"].(string)
+	}
 	env.EventID = env.StableEventID()
 	return env, nil
 }
 
+func parseRegistration(body []byte) (map[string]any, error) {
+	if len(body) < 37 {
+		return nil, fmt.Errorf("%w: registration body len=%d", ErrFrameTooShort, len(body))
+	}
+	registration := map[string]any{
+		"province":     binary.BigEndian.Uint16(body[0:2]),
+		"city":         binary.BigEndian.Uint16(body[2:4]),
+		"manufacturer": fixedText(body[4:9]),
+		"device_type":  fixedText(body[9:29]),
+		"device_id":    fixedText(body[29:36]),
+		"plate_color":  body[36],
+		"plate":        freeText(body[37:]),
+	}
+	return registration, nil
+}
+
+func parseAuthentication(body []byte) map[string]any {
+	token := freeText(body)
+	out := map[string]any{"token": token}
+	return out
+}
+
 func parseLocation(body []byte) (Location, error) {
 	if len(body) < 28 {
 		return Location{}, fmt.Errorf("%w: location body len=%d", ErrFrameTooShort, len(body))
@@ -269,6 +313,14 @@ func bcdString(data []byte) string {
 	return string(out)
 }
 
+func fixedText(data []byte) string {
+	return strings.Trim(freeText(data), "\x00 ")
+}
+
+func freeText(data []byte) string {
+	return strings.TrimRight(strings.TrimSpace(string(data)), "\x00")
+}
+
 func parseBCDTime(data []byte) time.Time {
 	if len(data) != 6 {
 		return time.Time{}