update 电单车协议

jsowell-common/src/main/java/com/jsowell/common/YouDianUtils.java

@@ -35,4 +35,26 @@ public class YouDianUtils {
         log.info("计算的校验值:{}, 接收到的校验值:{}", calculatedChecksum, receivedChecksum);
         return calculatedChecksum == receivedChecksum;
     }
+
+    /**
+     * 计算校验字段
+     */
+    public static int calculateCheckField(byte[] bytes) {
+        // 计算累加和
+        int sum = 0;
+        for (int i = 0; i < bytes.length - 2; i++) {
+            sum += (bytes[i] & 0xFF); // 将每个字节视为无符号值进行累加
+        }
+
+        // 取累加和的低 2 字节（16 位）
+        return sum & 0xFFFF;
+    }
+
+    /**
+     * 获取校验字段byte数组
+     */
+    public static byte[] getCheckFieldBytes(byte[] bytes) {
+        int calculatedChecksum = calculateCheckField(bytes);
+        return BytesUtil.intToBytesLittle(calculatedChecksum);
+    }
 }

jsowell-common/src/main/java/com/jsowell/common/core/domain/ebike/EBikeDataProtocol.java

@@ -67,7 +67,10 @@ public class EBikeDataProtocol {
 	 * @return 报文
 	 */
 	public String getHEXString() {
-		byte[] bytes = Bytes.concat(this.head, this.length, this.physicalId, this.messageId, this.command, this.msgBody, this.checksum);
-		return BytesUtil.binary(bytes, 16);
+		return BytesUtil.binary(this.getBytes(), 16);
+	}
+
+	public byte[] getBytes() {
+		return Bytes.concat(this.head, this.length, this.physicalId, this.messageId, this.command, this.msgBody, this.checksum);
 	}
 }