Fix errors when other servers connect

Author: LinkTechTips

src/main/java/org/linktechtips/process/network/ServerInterface.java

@@ -329,7 +329,7 @@ public void sendPacket(AbstractUser exclude, @Nullable AbstractUser direction, i
         assemble(buf, cmdNum, to, from, bi, pc, hc, data);
 
         if (direction != null) {
-            direction.uslprintf("%s\n", slCheck);
+            direction.uslprintf("%u\n", slCheck);
             return;
         }